high security bolt seals
high security bolt seals
2014年7月17日星期四
How to choose the use of new security seal labels it?
The new seals (blockade) as an anti-theft lock (logo mark), has been used in more and more areas described below are four ways to identify:
First, we must first choose a guaranteed mechanical security seals quality reputation of the manufacturer (no reputation for quality assurance of products will not achieve security meter seals is not tight locking action).
Second, signed a contract before ordering. Requiring manufacturers promise, security seal labels do not provide the same to a third party identity and number of the new seals (blockade) Accory security seals is very important.
Third, try not to choose the same size using a number of manufacturers have produced / color of the product (easily copied).
Fourth, any product has certain manufacturing costs, low prices of some products in the purchase must pay attention (by some manufacturers cut corners to reduce costs)....
2014年1月19日星期日
Three features of this plastic seal
Security protection, product storage plastic seals commodities and goods , as well as other protective protection, plastic sealing caulking materials and insulation, fully integrated to form a solid positive angle insulation protection system , no rust, alkali resistance, aging, high strength anti-invasion , effectively ensuring a positive angle vertical flat, plastic seals on both sides of the network structure , so that the bonding closer and more solid .
Plastic seal has the following advantages ;
1, the product has high strength ,Accory Fixed Length plastic seal good adhesion, fully integrated putty , etc., to facilitate the construction , reduce labor intensity , speed up the construction speed , reduce construction costs. Straight appearance, and greatly improves the impact resistance wall to protect the wall from damage , avoid damage the corner , repeated maintenance trouble.
2 , flexible, easy construction , beautiful arc .
3 , construction and long-term presence of the sun angle is not straight , beautiful, easy to damage , such as quality defects corners . In the treatment of external wall insulation , construction is slow , poor impact resistance corner , after a long period of weathering, water seepage , causing the wall to crack.
Use of this product will solve all these quality issues , the difficult problem of engineering the transfer of the wall , make sure the insulation layer does not crack , fiberglass mesh high bond strength, acid and alkali plastic strip . With this product, but also improve the level of shock , reducing plastic seals angle earthquake , door angle , Accory stainless steel cable tie the angle of the window construction difficulties and a new type of building material specially designed . Unique climate , corrosion resistance, anti-aging characteristics known for its strength and plastic seals, good toughness was assured , rather than steel, wood, aluminum and other traditional building materials
Plastic seal has the following advantages ;
1, the product has high strength ,Accory Fixed Length plastic seal good adhesion, fully integrated putty , etc., to facilitate the construction , reduce labor intensity , speed up the construction speed , reduce construction costs. Straight appearance, and greatly improves the impact resistance wall to protect the wall from damage , avoid damage the corner , repeated maintenance trouble.
2 , flexible, easy construction , beautiful arc .
3 , construction and long-term presence of the sun angle is not straight , beautiful, easy to damage , such as quality defects corners . In the treatment of external wall insulation , construction is slow , poor impact resistance corner , after a long period of weathering, water seepage , causing the wall to crack.
Use of this product will solve all these quality issues , the difficult problem of engineering the transfer of the wall , make sure the insulation layer does not crack , fiberglass mesh high bond strength, acid and alkali plastic strip . With this product, but also improve the level of shock , reducing plastic seals angle earthquake , door angle , Accory stainless steel cable tie the angle of the window construction difficulties and a new type of building material specially designed . Unique climate , corrosion resistance, anti-aging characteristics known for its strength and plastic seals, good toughness was assured , rather than steel, wood, aluminum and other traditional building materials
2014年1月12日星期日
Seal it using what processes
1 seal by the dispatcher brought out from the warehouse to confirm good seal numbers kept by the control room, and the establishment of seals using the ledger ;
2 Use the seal departments for use according to the number of seals, seal collection after collection using the unit must be confirmed by the managers , who are not free to receive without permission seals accory pull tight plastic seals. Seal recipients must receive the seal records indicate the collection time , the use of area , volume, number, and signature ;
3 recipients must keep the collar seals are not free to lend , transfer , copy, forgery ;
4 all my company into the factory oil must be handled carefully sealed to fill a single seal , seal slip seals to indicate the specific location , number and signature confirmation , etc., and seals to keep a single , non- lost ;
After 5 or exotic destination oil factory oil into the plant, must be made by hand on the seal to check on the vehicle before unloading . After checking the seals single- handed control room in time , the number of seals conducted by a number of check dispatchers ;
6 Public Service District in offering contracts must have someone to play track inspection seals , seals kick after notification squad or team leader management staff to check the area on duty cadres must ensure that not less than ten percent of the check car rates ;
7 port for unloading vehicles no individual or no cover gasket must be complete before the back cover with the loading and unloading accory identification cable ties;
8 foreign oil loading process should be sealed deal , must be checked by the relevant person in charge confirmed after sealed.
2 Use the seal departments for use according to the number of seals, seal collection after collection using the unit must be confirmed by the managers , who are not free to receive without permission seals accory pull tight plastic seals. Seal recipients must receive the seal records indicate the collection time , the use of area , volume, number, and signature ;
3 recipients must keep the collar seals are not free to lend , transfer , copy, forgery ;
4 all my company into the factory oil must be handled carefully sealed to fill a single seal , seal slip seals to indicate the specific location , number and signature confirmation , etc., and seals to keep a single , non- lost ;
After 5 or exotic destination oil factory oil into the plant, must be made by hand on the seal to check on the vehicle before unloading . After checking the seals single- handed control room in time , the number of seals conducted by a number of check dispatchers ;
6 Public Service District in offering contracts must have someone to play track inspection seals , seals kick after notification squad or team leader management staff to check the area on duty cadres must ensure that not less than ten percent of the check car rates ;
7 port for unloading vehicles no individual or no cover gasket must be complete before the back cover with the loading and unloading accory identification cable ties;
8 foreign oil loading process should be sealed deal , must be checked by the relevant person in charge confirmed after sealed.
2013年12月23日星期一
Large windows and doors spring dust storm from the beginning
Spring wind, pervasive dust so that we stand it seems to rub home furniture re- ground , inevitably touched hand gray , so the spring anti-wind is a problem !
Important reason for many people at home , " eat dust " is the existence of a gap or window material aging , Pidian , damaged seals around doors and door bottom . Generally, door weight of a sand -proof ring . At present, many doors are steel security door, the door seal is good with the flatness of the door and sealing systems have a great relationship . If the door is not enough flatness or deformed , there will be sand quietly invasion. So when buying or replacing security door, choose a flat , excellent quality security door is critical .
For the old house , the anti-wind windows necessary to transform . There are four main forms:
1 , the installation of a new layer in the interior side of the window , which requires the original window openings have sufficient width countertops , new window frames sufficient thickness ;
2, with the original window frame as a new sub-frame windows , installing a new layer in the sub- frame windows .security ties This approach in a highly original window frame lower case selection, such as ordinary aluminum sliding window , otherwise it will affect the indoor lighting ;
3 , the transformation of the windows only open fan, replace the fan body and hardware to achieve the sealing effect , but it requires new windows and window profiles consistent with the original ;
4 , replacing the doors and windows sealed . According to the specifications of the doors and windows to select the matching model : D -type , P -, E- , I -type , such as , according to the doors of the main colors choose black , gray, white, brown , etc., and choose different specifications according to the size of the gap .
Finally, to remind everyone that if it is carried out a comprehensive reform of doors and windows , the best professional company to do . They will check the house wall structure , doors and windows of the structure and size, and then set a reasonable solution.ylon zip ties In addition , buy windows should also pay attention to the choice of plastic double-glazed windows with screens, windows sealing strip is particularly important because of its warmth , noise , anti-wind effects are better.
Important reason for many people at home , " eat dust " is the existence of a gap or window material aging , Pidian , damaged seals around doors and door bottom . Generally, door weight of a sand -proof ring . At present, many doors are steel security door, the door seal is good with the flatness of the door and sealing systems have a great relationship . If the door is not enough flatness or deformed , there will be sand quietly invasion. So when buying or replacing security door, choose a flat , excellent quality security door is critical .
For the old house , the anti-wind windows necessary to transform . There are four main forms:
1 , the installation of a new layer in the interior side of the window , which requires the original window openings have sufficient width countertops , new window frames sufficient thickness ;
2, with the original window frame as a new sub-frame windows , installing a new layer in the sub- frame windows .security ties This approach in a highly original window frame lower case selection, such as ordinary aluminum sliding window , otherwise it will affect the indoor lighting ;
3 , the transformation of the windows only open fan, replace the fan body and hardware to achieve the sealing effect , but it requires new windows and window profiles consistent with the original ;
4 , replacing the doors and windows sealed . According to the specifications of the doors and windows to select the matching model : D -type , P -, E- , I -type , such as , according to the doors of the main colors choose black , gray, white, brown , etc., and choose different specifications according to the size of the gap .
Finally, to remind everyone that if it is carried out a comprehensive reform of doors and windows , the best professional company to do . They will check the house wall structure , doors and windows of the structure and size, and then set a reasonable solution.ylon zip ties In addition , buy windows should also pay attention to the choice of plastic double-glazed windows with screens, windows sealing strip is particularly important because of its warmth , noise , anti-wind effects are better.
2013年12月9日星期一
How to correctly apply seals
Proper application of seals can improve the safety of work :
1 person has no right to sealed properly applied closure device in the vehicle Guankou unsealed .
(2) All drivers are not be altered by seals, wire seals such as the discovery of internal abnormalities , must live sealed, signed off by the client . While reporting to management personnel , business dedicated to confirm
3 the driver of the vehicle at the scene only Guankou sealed.
(4) Other personnel , such as work needs to be unsealed , shall notify customers unsealed and sealed together .
5 When Guankou device sealed , must be clearly visible logo and number on seals .
6 sealed after the first wire length should not exceed 1.5cm, cut off the excess wire rope shall be treated with diagonal pliers, pull out the head hole wire spread .
7 logo and number font is unclear,cable sealing the responsible person shall promptly report to the users , the timely replacement .
1 person has no right to sealed properly applied closure device in the vehicle Guankou unsealed .
(2) All drivers are not be altered by seals, wire seals such as the discovery of internal abnormalities , must live sealed, signed off by the client . While reporting to management personnel , business dedicated to confirm
3 the driver of the vehicle at the scene only Guankou sealed.
(4) Other personnel , such as work needs to be unsealed , shall notify customers unsealed and sealed together .
5 When Guankou device sealed , must be clearly visible logo and number on seals .
6 sealed after the first wire length should not exceed 1.5cm, cut off the excess wire rope shall be treated with diagonal pliers, pull out the head hole wire spread .
7 logo and number font is unclear,cable sealing the responsible person shall promptly report to the users , the timely replacement .
2013年11月22日星期五
The performance of the mechanical seal failure and the reasons
Mechanical seal failure in the operation of rotating equipment parts which, they would often wear the seal faces, thermal cracking, deformation, breakage, etc., will be the spring with a long relaxation, fracture and corrosion. Secondary seal cracks will appear, twisted and deformed, broken and so on.
Mechanical seal vibration, heat cause of the malfunction
During rotation of the device, causes the end face of the static ring bonded rough movement ring and seal chamber gap is too small, the runout caused by collision induced vibration. Sometimes, because of the seal faces resistance to corrosion and heat resistance poor or insufficient cooling or end during the installation folder particulate impurities can cause mechanical vibration and heat sealed.
Reasons for failure of the mechanical seal media leaks
(1) Static pressure leak test. Because of the mechanical seal is not careful when installing, tend to make the seal faces are bruised, deformation, damage, clean up without a net, there are the granular impurities, or due to loose screws, no compression gland, machinery, equipment, precision is not enough , so that the sealing surface is not completely fit, will cause media leaks. If it is missing sleeve bushing seal assembly is pressed or not enough compression or damage. (2) periodic or episodic leakage. plastic strap seal Mechanical seal rotor assembly periodic vibration, axial runout too, can cause leakage. Mechanical seal sealing surface pressure to have a certain ratio, so as to function as a sealing, mechanical seal which requires to have a certain amount of compression of the spring, a thrust force to the seal faces, so that the rotating sealing surface sealing up the required ratio pressure. To guarantee this one than the pressure required mechanical shaft seal can not have too much channeling amount, generally to ensure that within 0.25mm. However, in practical designs, the design is unreasonable, the shaft tends to produce a large amount of channeling, the use of mechanical seals are very unfavorable. (3) recurrent mechanical seal leakage. Frequent cause of mechanical seal leaks in many aspects. Firstly, since the seal faces recurring defects caused by the leak. The second aspect is secondary seal caused by recurring leaks. Third, the spring leakage defects. Other aspects include leakage rotor vibration caused by bad driving, and thrust tight or loose parts quality caused leaks, leaks caused by mechanical seal auxiliary organizations, the media due to problems caused by recurrent leakage. (4) mechanical seal vibration is too large.plastic strap seals Mechanical seal vibration is too large, resulting in loss of seal. But the mechanical seal is often the cause of vibration larger reason than just mechanical seal itself, other parts of the pump is also the root cause of vibration, such as shaft design is unreasonable, because of processing, lack of precision bearings, parallel coupling poor, radial force and other reasons
Mechanical seal vibration, heat cause of the malfunction
During rotation of the device, causes the end face of the static ring bonded rough movement ring and seal chamber gap is too small, the runout caused by collision induced vibration. Sometimes, because of the seal faces resistance to corrosion and heat resistance poor or insufficient cooling or end during the installation folder particulate impurities can cause mechanical vibration and heat sealed.
Reasons for failure of the mechanical seal media leaks
(1) Static pressure leak test. Because of the mechanical seal is not careful when installing, tend to make the seal faces are bruised, deformation, damage, clean up without a net, there are the granular impurities, or due to loose screws, no compression gland, machinery, equipment, precision is not enough , so that the sealing surface is not completely fit, will cause media leaks. If it is missing sleeve bushing seal assembly is pressed or not enough compression or damage. (2) periodic or episodic leakage. plastic strap seal Mechanical seal rotor assembly periodic vibration, axial runout too, can cause leakage. Mechanical seal sealing surface pressure to have a certain ratio, so as to function as a sealing, mechanical seal which requires to have a certain amount of compression of the spring, a thrust force to the seal faces, so that the rotating sealing surface sealing up the required ratio pressure. To guarantee this one than the pressure required mechanical shaft seal can not have too much channeling amount, generally to ensure that within 0.25mm. However, in practical designs, the design is unreasonable, the shaft tends to produce a large amount of channeling, the use of mechanical seals are very unfavorable. (3) recurrent mechanical seal leakage. Frequent cause of mechanical seal leaks in many aspects. Firstly, since the seal faces recurring defects caused by the leak. The second aspect is secondary seal caused by recurring leaks. Third, the spring leakage defects. Other aspects include leakage rotor vibration caused by bad driving, and thrust tight or loose parts quality caused leaks, leaks caused by mechanical seal auxiliary organizations, the media due to problems caused by recurrent leakage. (4) mechanical seal vibration is too large.plastic strap seals Mechanical seal vibration is too large, resulting in loss of seal. But the mechanical seal is often the cause of vibration larger reason than just mechanical seal itself, other parts of the pump is also the root cause of vibration, such as shaft design is unreasonable, because of processing, lack of precision bearings, parallel coupling poor, radial force and other reasons
2013年11月4日星期一
Seal packing precautions before installation , how to choose a suitable packing
A seal packing precautions before installing what ?
Sealing Packing Precautions before installation :
Remove old packing stuffing box is pre- installation inspection to prepare the point.
With the old filler filler before the first use special tools to remove all the stuffing box clean
Observe the various parts of the stuffing box without injury eccentricity defects , damage of the stem, bushings and packing stuffing box can affect performance.
Check whether other components can also be applied . Replace all damaged parts .
Second, how to choose a suitable packing ?
How to choose the right packing ? Packing in the selection must take into account two things.
① conditions required performance should be consistent with the packing . According to the relevant technical data to select the most able to meet the requirements of packing.
② sealing requirements must be based on the correct choice packing size. To determine the cross-section ,fixed length plastic strap seal please use the following formula estimates:
Cross-section = ( stuffing box diameter - stem diameter ) / 2
The apparatus of injury may need a larger cross-sectional packing, in order to compensate for damage.
Third, cutting and sealing packing installation pay attention to details
Cutting and sealing packing installation pay attention to details
1 , select the appropriate packing, mechanical precision cut by cutting the required length of the packing ring , without packing cutting machinery, in accordance with packing length L = ( D + packing shaft width S) X1.07X Ji to cutting, generally rotary shaft , a 90 ° straight cut, the valve with a 45 ° cut . Never tried to surround the stuffing box packing to determine the length . Or the packing around the stem with the same . Of a tube, it firmly suppressed, but not stretched packing. Then cut into sample loop , and verify whether it can properly fill the space , and to ensure there are no gaps at its interface . Then be used as a standard sample loop cutting other packing rings . If the finished product on a flat surface finish , soft or easily deformed if the packing can be produced according to a small sample loop tape , and talking under the rope to make the rest of the packing rings .
2, when packing for the valve, tamper evident tapes the valve packing section and the same space , it is best to preload ring: When used in pump, valve packing section and space ( approximately 0.3MM-0.6MM) and the shaft packing has a leak gap in favor lubrication and cooling .
3 , first install a filler ring , make sure no glue each filler dust or other debris . If needed, packing ring on the stem should be the same with the use of clean oil to lubricate . Staggered placement of each packing ring into 90 °. Ring in the axial slowly opened.
Sealing Packing Precautions before installation :
Remove old packing stuffing box is pre- installation inspection to prepare the point.
With the old filler filler before the first use special tools to remove all the stuffing box clean
Observe the various parts of the stuffing box without injury eccentricity defects , damage of the stem, bushings and packing stuffing box can affect performance.
Check whether other components can also be applied . Replace all damaged parts .
Second, how to choose a suitable packing ?
How to choose the right packing ? Packing in the selection must take into account two things.
① conditions required performance should be consistent with the packing . According to the relevant technical data to select the most able to meet the requirements of packing.
② sealing requirements must be based on the correct choice packing size. To determine the cross-section ,fixed length plastic strap seal please use the following formula estimates:
Cross-section = ( stuffing box diameter - stem diameter ) / 2
The apparatus of injury may need a larger cross-sectional packing, in order to compensate for damage.
Third, cutting and sealing packing installation pay attention to details
Cutting and sealing packing installation pay attention to details
1 , select the appropriate packing, mechanical precision cut by cutting the required length of the packing ring , without packing cutting machinery, in accordance with packing length L = ( D + packing shaft width S) X1.07X Ji to cutting, generally rotary shaft , a 90 ° straight cut, the valve with a 45 ° cut . Never tried to surround the stuffing box packing to determine the length . Or the packing around the stem with the same . Of a tube, it firmly suppressed, but not stretched packing. Then cut into sample loop , and verify whether it can properly fill the space , and to ensure there are no gaps at its interface . Then be used as a standard sample loop cutting other packing rings . If the finished product on a flat surface finish , soft or easily deformed if the packing can be produced according to a small sample loop tape , and talking under the rope to make the rest of the packing rings .
2, when packing for the valve, tamper evident tapes the valve packing section and the same space , it is best to preload ring: When used in pump, valve packing section and space ( approximately 0.3MM-0.6MM) and the shaft packing has a leak gap in favor lubrication and cooling .
3 , first install a filler ring , make sure no glue each filler dust or other debris . If needed, packing ring on the stem should be the same with the use of clean oil to lubricate . Staggered placement of each packing ring into 90 °. Ring in the axial slowly opened.
2013年11月3日星期日
Plant transformation advantages pump seals
Over the operational status of the pump before and after reconstruction comparing this transformation has several advantages .
Save money
Although the transformation of the former investment more ( Note : buy American -made packing guns need 10000.00 yuan / to ; wadding 6000.00 yuan / kg), but because of its durability ,wire seals and is a one-time investment , from a longer time perspective, than with packing can save money by about 30% .
Little maintenance and easy
When the pump runs less time that a leak can be directly injected filler gun to packing room , and do not stop, than the tight packing method to be convenient and effective. And that such filler longer period, generally up to three months ( continuous pump operating conditions ) . Do not need to run for the period just add filler filler.
Sealing effect
Use of effective, safe, using a wide range . As the filler was mashed in a pressure situation tightly, so good sealing effect . The filler mainly composed of carbon fiber , Teflon , Kevlar and other synthetic raw materials , high abrasion resistance , low friction coefficient , and a good impermeability of the protection sleeve is very favorable. By comparison, the life cycle of the sleeve longer than the transformation of the former more than doubled. And it is not only for cold water pump, heat pumps can also be used ( eg drain pump ) , and suitable for different sizes of pumps.
Most power plants in Guang'an stage single-stage overhung centrifugal pump mechanical seal is used ,nylon cable ties it can be in a single-stage double-suction centrifugal pumps ( such as open-cycle cooling water pump ) and other low-pressure pump on the transformation , while reducing maintenance and operating personnel and equipment leaks , and to promote economic efficiency plant .
Save money
Although the transformation of the former investment more ( Note : buy American -made packing guns need 10000.00 yuan / to ; wadding 6000.00 yuan / kg), but because of its durability ,wire seals and is a one-time investment , from a longer time perspective, than with packing can save money by about 30% .
Little maintenance and easy
When the pump runs less time that a leak can be directly injected filler gun to packing room , and do not stop, than the tight packing method to be convenient and effective. And that such filler longer period, generally up to three months ( continuous pump operating conditions ) . Do not need to run for the period just add filler filler.
Sealing effect
Use of effective, safe, using a wide range . As the filler was mashed in a pressure situation tightly, so good sealing effect . The filler mainly composed of carbon fiber , Teflon , Kevlar and other synthetic raw materials , high abrasion resistance , low friction coefficient , and a good impermeability of the protection sleeve is very favorable. By comparison, the life cycle of the sleeve longer than the transformation of the former more than doubled. And it is not only for cold water pump, heat pumps can also be used ( eg drain pump ) , and suitable for different sizes of pumps.
Most power plants in Guang'an stage single-stage overhung centrifugal pump mechanical seal is used ,nylon cable ties it can be in a single-stage double-suction centrifugal pumps ( such as open-cycle cooling water pump ) and other low-pressure pump on the transformation , while reducing maintenance and operating personnel and equipment leaks , and to promote economic efficiency plant .
2013年10月31日星期四
High performance soft seal butterfly valve
Characterized in that : said seat ring by a T -shaped tamper evident tape ring on both sides of the soft multi-layer stainless steel sheet .
Valve plate and valve seat sealing surface for the oblique cone structure , oblique cone surface of the valve plate welding temperature, corrosion resistant alloy material ; adjusting ring plate fixed on the spring between the platen adjustment screw assembly structures. This structure effectively compensate for tolerances between the sleeve and the valve stem in the medium band and elastic deformation under pressure to solve the two-way valve in the transmission medium of exchange sealing problems exist in the process .
Use of soft T seals on both sides of multilayer stainless steel sheet , with a metal seal and soft seal the dual advantages of both low and high temperatures, both with zero leakage sealing performance . Test proved positive Chi flow state ( medium flow direction and the disc rotation in the same direction ) , the sealing surface pressure is the transmission of torque and media pressure on the valve plate produced by interaction . Forward medium pressure increases, the valve plate oblique cone surface and the valve seat sealing surface squeezed more tightly , sealing the better .
When the counter state, the valve plate and valve seat seal for containers between the drive torque to the valve plate is pressed against the valve seat . With reverse media pressure , the valve plate and valve seat pressure between the units is less than the medium pressure, adjusting ring spring contained in the subject after the deformation energy stored in compensation valve plate and valve seat sealing surface of the clamping pressure play the role of automatic compensation .
Therefore, the utility model, unlike the existing technologies, as the valve plate mounting hardware multi ring, but directly mounted on the valve body , the middle seat in the platen and an additional adjustment ring is a very good way to two-way seal . It can replace the valve, and ball valve .
Valve plate and valve seat sealing surface for the oblique cone structure , oblique cone surface of the valve plate welding temperature, corrosion resistant alloy material ; adjusting ring plate fixed on the spring between the platen adjustment screw assembly structures. This structure effectively compensate for tolerances between the sleeve and the valve stem in the medium band and elastic deformation under pressure to solve the two-way valve in the transmission medium of exchange sealing problems exist in the process .
Use of soft T seals on both sides of multilayer stainless steel sheet , with a metal seal and soft seal the dual advantages of both low and high temperatures, both with zero leakage sealing performance . Test proved positive Chi flow state ( medium flow direction and the disc rotation in the same direction ) , the sealing surface pressure is the transmission of torque and media pressure on the valve plate produced by interaction . Forward medium pressure increases, the valve plate oblique cone surface and the valve seat sealing surface squeezed more tightly , sealing the better .
When the counter state, the valve plate and valve seat seal for containers between the drive torque to the valve plate is pressed against the valve seat . With reverse media pressure , the valve plate and valve seat pressure between the units is less than the medium pressure, adjusting ring spring contained in the subject after the deformation energy stored in compensation valve plate and valve seat sealing surface of the clamping pressure play the role of automatic compensation .
Therefore, the utility model, unlike the existing technologies, as the valve plate mounting hardware multi ring, but directly mounted on the valve body , the middle seat in the platen and an additional adjustment ring is a very good way to two-way seal . It can replace the valve, and ball valve .
2013年10月27日星期日
Soft sealing gate by friction resolve technical design
First, the technical background :
Existing in the body of the valve , the valve cover and the case member are intact , only slight deformation or corrosion of the sealing surface , the valve can not be used . Fix these valves non-professional plant can not, therefore resulting in a great waste . Therefore, the use of units of hope Valve is : seat , the valve plate sealing surface is not easy deformation , corrosion , wearing sealing material can be changed . In opening and closing the valve plate not to have friction with the sealing surface or minimize friction, avoid soft sealing gate various deficiencies .
Second, the purpose of the invention :
Solve the seat and the valve plate sealing surface corrosion or deformation , the valve plate can automatically compensate and close the cover and press the soft sealing gate automatic pressure balance between the problems solved by the soft sealing material sealing surface friction and damage problems due to the valve sealing cap can be changed, greatly increased the use of valves .
Third, the practical range :
Bore φ50-φ400mm, pressure 2.5-4.0MPa, less than 200 ℃ for various liquid at room temperature
Fourth, the technical solutions :
The valves are double parallel gate valve , numbered seals inlet seals, inlet valve plate by a sealing sleeve and unloading force composed mainly sealed gate valve plate . Sealing sleeve and valve plate unloading force synchronous movement but not connected to the pipeline pressure through the valve plate unloading force , leveling arm passed to the exit side of the seat , which will greatly improve the soft sealing surface adhesion. Valve plate outside the set of a corrosion-resistant rubber seal sets. Soft sealing material in the opening and closing process , and the seat to keep a certain distance , the soft sealing material in the absence of friction without folding pressure environment. Gland in the pipeline transportation of the liquid components within the valve isolation , nylon cable tie corrosion and impurities from the liquid blocking . This valve is very easy to replace a sealing material , so the service life is generally more than 5 times the gate valve .
Existing in the body of the valve , the valve cover and the case member are intact , only slight deformation or corrosion of the sealing surface , the valve can not be used . Fix these valves non-professional plant can not, therefore resulting in a great waste . Therefore, the use of units of hope Valve is : seat , the valve plate sealing surface is not easy deformation , corrosion , wearing sealing material can be changed . In opening and closing the valve plate not to have friction with the sealing surface or minimize friction, avoid soft sealing gate various deficiencies .
Second, the purpose of the invention :
Solve the seat and the valve plate sealing surface corrosion or deformation , the valve plate can automatically compensate and close the cover and press the soft sealing gate automatic pressure balance between the problems solved by the soft sealing material sealing surface friction and damage problems due to the valve sealing cap can be changed, greatly increased the use of valves .
Third, the practical range :
Bore φ50-φ400mm, pressure 2.5-4.0MPa, less than 200 ℃ for various liquid at room temperature
Fourth, the technical solutions :
The valves are double parallel gate valve , numbered seals inlet seals, inlet valve plate by a sealing sleeve and unloading force composed mainly sealed gate valve plate . Sealing sleeve and valve plate unloading force synchronous movement but not connected to the pipeline pressure through the valve plate unloading force , leveling arm passed to the exit side of the seat , which will greatly improve the soft sealing surface adhesion. Valve plate outside the set of a corrosion-resistant rubber seal sets. Soft sealing material in the opening and closing process , and the seat to keep a certain distance , the soft sealing material in the absence of friction without folding pressure environment. Gland in the pipeline transportation of the liquid components within the valve isolation , nylon cable tie corrosion and impurities from the liquid blocking . This valve is very easy to replace a sealing material , so the service life is generally more than 5 times the gate valve .
2013年10月26日星期六
Centrifugal pump mechanical seal failure causes
1, the static ring sealing surface leakage
Main reasons are: face flatness, roughness does not meet the requirements, or surface scratches ; face between particulate matter , resulting in both ends of the surface can not be the same run ; installed in place , incorrectly.
2 , the compensation ring seal leak
Main reasons are: gland deformation, uneven preload ; installed incorrectly ; seals do not meet quality standards ; ring selection is wrong.
Actual results showed that most parts of the failure of the sealing element is dynamic and static ring end face mechanical seal centrifugal dynamic and static ring face is a common failure occurs cracking phenomenon for two main reasons :
① sealing surface when installing the gap is too big , too late to rinse away the heat generated by friction ; flushing fluid leakage from the sealing surface clearance to go , resulting in overheating and damage to the end face .
② liquid medium vapor expansion , so that both ends of the surface by the vapor expansion force to separate , when the two sealing surfaces when bonding force , resulting in destruction of the lubricating film facing surface overheating.
③ poor lubricating liquid medium , together with the operating pressure overload, the two sealing surfaces trace rotation is not synchronized. Such as high speed pump speed is 20445r/min, central diameter of the sealing surface 7cm, pump operation after the line speed up 75m / s, when there is a lag can not track the rotating sealing surface , the sealing surface is damaged resulting in instantaneous temperature .
④ sealing fluid orifice or filter is clogged , causing water shortage, so that the mechanical seal failure.
In addition , the sealing surface slippery surface ditch , face a gap of bonding lead to failure of the sealing element ,nylon cable ties two main reasons:
① dirty liquid medium , a small hard particles , people at high speed sliding sealing surface , the end surface scratches and failure.
② poor coaxial transmission parts pump , the pump is turned face each revolution is shaking friction once, moving ring running track misalignment , causing vaporization face , overheating wear.
③ liquid medium caused by the frequent occurrence of hydraulic characteristics of pump vibration , resulting in the sealing surface dislocation and failure.
The sealing element is a liquid medium corrosion, stress concentration , with soft and hard materials , erosion , secondary seal O-ring , V -ring , is not compatible with the liquid medium concave ring , deformation, surface damage can cause failure of the mechanical metal cable ties , so form of damage to its comprehensive analysis to identify the root cause , to ensure the long-running mechanical seals .
Main reasons are: face flatness, roughness does not meet the requirements, or surface scratches ; face between particulate matter , resulting in both ends of the surface can not be the same run ; installed in place , incorrectly.
2 , the compensation ring seal leak
Main reasons are: gland deformation, uneven preload ; installed incorrectly ; seals do not meet quality standards ; ring selection is wrong.
Actual results showed that most parts of the failure of the sealing element is dynamic and static ring end face mechanical seal centrifugal dynamic and static ring face is a common failure occurs cracking phenomenon for two main reasons :
① sealing surface when installing the gap is too big , too late to rinse away the heat generated by friction ; flushing fluid leakage from the sealing surface clearance to go , resulting in overheating and damage to the end face .
② liquid medium vapor expansion , so that both ends of the surface by the vapor expansion force to separate , when the two sealing surfaces when bonding force , resulting in destruction of the lubricating film facing surface overheating.
③ poor lubricating liquid medium , together with the operating pressure overload, the two sealing surfaces trace rotation is not synchronized. Such as high speed pump speed is 20445r/min, central diameter of the sealing surface 7cm, pump operation after the line speed up 75m / s, when there is a lag can not track the rotating sealing surface , the sealing surface is damaged resulting in instantaneous temperature .
④ sealing fluid orifice or filter is clogged , causing water shortage, so that the mechanical seal failure.
In addition , the sealing surface slippery surface ditch , face a gap of bonding lead to failure of the sealing element ,nylon cable ties two main reasons:
① dirty liquid medium , a small hard particles , people at high speed sliding sealing surface , the end surface scratches and failure.
② poor coaxial transmission parts pump , the pump is turned face each revolution is shaking friction once, moving ring running track misalignment , causing vaporization face , overheating wear.
③ liquid medium caused by the frequent occurrence of hydraulic characteristics of pump vibration , resulting in the sealing surface dislocation and failure.
The sealing element is a liquid medium corrosion, stress concentration , with soft and hard materials , erosion , secondary seal O-ring , V -ring , is not compatible with the liquid medium concave ring , deformation, surface damage can cause failure of the mechanical metal cable ties , so form of damage to its comprehensive analysis to identify the root cause , to ensure the long-running mechanical seals .
2013年9月17日星期二
High speed mechanical seal
When the speed exceeds 3000r/min or friction than the linear velocity of 25m / s , generally can be regarded as high fixed length plastic strap seal. At high speed , the friction face the linear velocity is large, the heat generated by friction is also more difficult to form film end time , wear and tear .
Speed is also likely to cause vibration of the rotating ring , and by a large centrifugal force , the liquid film between the end faces is not conducive to the formation and maintenance . Therefore, at high speed , to reduce the centrifugal force and vibration, the rotary member should be minimized , spring static structure. You can also enhance the friction face of the cooling and lubrication. It may also be used [PV] the value of high friction material , reducing the width of the contact face , or using a controlled membrane mechanical seal.
In recent years, called the differential ring of the mechanical padlock seals also been applied to high-speed devices . Since the middle of the original movement joined a differential ring ring friction line speed can be reduced by half , and achieved good results.
Speed is also likely to cause vibration of the rotating ring , and by a large centrifugal force , the liquid film between the end faces is not conducive to the formation and maintenance . Therefore, at high speed , to reduce the centrifugal force and vibration, the rotary member should be minimized , spring static structure. You can also enhance the friction face of the cooling and lubrication. It may also be used [PV] the value of high friction material , reducing the width of the contact face , or using a controlled membrane mechanical seal.
In recent years, called the differential ring of the mechanical padlock seals also been applied to high-speed devices . Since the middle of the original movement joined a differential ring ring friction line speed can be reduced by half , and achieved good results.
2013年9月9日星期一
Brief sealant to save money
Recently , the famous American expert author doors sealant Analysis of how to reduce costs. Here we have to introduce the following is relatively feasible way to reduce the amount of binder . However, there is a sentence I still want to reiterate advice : Although the choice of the sealing glue to consider the cost issue , however, the choice really suitable for their sealing glue also need to consider aspects , should not suffer a great deal because they are cheap . Perhaps, inexpensive sealant can save a lot of money for us , but its performance is not necessarily perfect , and afterwards perhaps to compensate for the cost of expensive loophole . Therefore , the choice of sealant before sealing adhesions best first senior expert advice to determine the best match their needs with sealing glue . Delineation of the optional sealing glue , you can follow these steps to cut your costs sealant :
1 Do not use too much glue seal security . Sometimes , manufacturers that use more glue sealing , adhesion effect is more ideal , in fact , this is a wrong idea. Excessive use of adhesives, adhesives not only increase the cost , in fact, the connection will also affect results. If you have questions about the amount of sealant , it is best to consult a sealant product sales personnel or the manufacturer's technical staff, they will provide you with practical solutions .
(2) reduce the fill point of application equipment . If you often need to replace the adhesive residue , then try to reduce the fill point of application equipment .
3 prolong the shelf life of the sealing glue . If one could ever use a whole bucket of sealant, so as soon as possible to re- packaged sealant containers to prevent product freezing or evaporation .
4 Check the pressure equipment . If the device is too much pressure will cause the sealant waste and affect the life of the pump . Here you need to do is to determine a reasonable pressure setting , and to ensure strict compliance with the equipment operator settings .
5 regular testing and maintenance of your equipment . Regular maintenance will improve equipment performance , in addition, can also reduce equipment maintenance costs.
6 compared to other sealing products , water-based sealants can be significant cost savings. Therefore , the choice of sealant products , try to give priority to water seal products. Water-based sealing products easy to clean and easy to use conditions , unlike chemical truck seal glue , long-term maintenance of the equipment is required on the high investment .
7 repeated use of purified water and cleaning water . For the production of the device configuration can be used repeatedly washing water system, water purification and repeated use of the washing water .
1 Do not use too much glue seal security . Sometimes , manufacturers that use more glue sealing , adhesion effect is more ideal , in fact , this is a wrong idea. Excessive use of adhesives, adhesives not only increase the cost , in fact, the connection will also affect results. If you have questions about the amount of sealant , it is best to consult a sealant product sales personnel or the manufacturer's technical staff, they will provide you with practical solutions .
(2) reduce the fill point of application equipment . If you often need to replace the adhesive residue , then try to reduce the fill point of application equipment .
3 prolong the shelf life of the sealing glue . If one could ever use a whole bucket of sealant, so as soon as possible to re- packaged sealant containers to prevent product freezing or evaporation .
4 Check the pressure equipment . If the device is too much pressure will cause the sealant waste and affect the life of the pump . Here you need to do is to determine a reasonable pressure setting , and to ensure strict compliance with the equipment operator settings .
5 regular testing and maintenance of your equipment . Regular maintenance will improve equipment performance , in addition, can also reduce equipment maintenance costs.
6 compared to other sealing products , water-based sealants can be significant cost savings. Therefore , the choice of sealant products , try to give priority to water seal products. Water-based sealing products easy to clean and easy to use conditions , unlike chemical truck seal glue , long-term maintenance of the equipment is required on the high investment .
7 repeated use of purified water and cleaning water . For the production of the device configuration can be used repeatedly washing water system, water purification and repeated use of the washing water .
2013年8月15日星期四
Polyurethane seals materials development and application of
High-temperature polyurethane material
Modern thermoplastic polyurethane (TPU) security seals operating temperature from -40 ℃ ~ +120 ℃, and strong chemical medium can also be adapted. While also maintaining a high capacity and good wear resistance to extrusion and other basic properties. Even in the case without lubrication, the piston rod seals can be under a pressure of 10MPa 0.05m / s speed reciprocating motion. Through the ISO standard cylinder piston seals long-term tests showed that the life of the seal polyurethane material is the same shape and size of nitrile rubber seal 5 to 6 times.
Polyurethane seal material as in the 20th century in the early 1980s to get a breakthrough. At that time, including a number of companies, including Parker manufacturers develop more hydrolysis resistant polyurethane material, these new polyurethane seal at high pressure and which maintain high flexibility +110 ℃, to achieve a better sealing performance, as well than the original The polyurethane (only resistant to high temperature +80 ℃) longer working life. This achievement opens the door to mobile hydraulic applications, whereas before designers in the industry do not trust very original polyurethane material seals. 1989, P5008 materials obtained using an approved Caterpillar plants worldwide, this recognition marks the Parker trailer seals Polyurethane materials application in earthmoving equipment to achieve a breakthrough. Thermoplastic polyurethane (TPU) Seal System application in the excavator soon largely replaced by 5 to 7 V-ring rubber cloth portfolio structure. Ten years ago this success, making further expanded its investment in the development of new polyurethane material. The new "custom-made" thermoplastic polyurethane material varieties, shapes and seals more more economical production expanded range of potential applications.
Modern thermoplastic polyurethane (TPU) security seals operating temperature from -40 ℃ ~ +120 ℃, and strong chemical medium can also be adapted. While also maintaining a high capacity and good wear resistance to extrusion and other basic properties. Even in the case without lubrication, the piston rod seals can be under a pressure of 10MPa 0.05m / s speed reciprocating motion. Through the ISO standard cylinder piston seals long-term tests showed that the life of the seal polyurethane material is the same shape and size of nitrile rubber seal 5 to 6 times.
Polyurethane seal material as in the 20th century in the early 1980s to get a breakthrough. At that time, including a number of companies, including Parker manufacturers develop more hydrolysis resistant polyurethane material, these new polyurethane seal at high pressure and which maintain high flexibility +110 ℃, to achieve a better sealing performance, as well than the original The polyurethane (only resistant to high temperature +80 ℃) longer working life. This achievement opens the door to mobile hydraulic applications, whereas before designers in the industry do not trust very original polyurethane material seals. 1989, P5008 materials obtained using an approved Caterpillar plants worldwide, this recognition marks the Parker trailer seals Polyurethane materials application in earthmoving equipment to achieve a breakthrough. Thermoplastic polyurethane (TPU) Seal System application in the excavator soon largely replaced by 5 to 7 V-ring rubber cloth portfolio structure. Ten years ago this success, making further expanded its investment in the development of new polyurethane material. The new "custom-made" thermoplastic polyurethane material varieties, shapes and seals more more economical production expanded range of potential applications.
2013年8月13日星期二
Summary seal types and standards
About professional products: Refers to the mechanical seal used in professional products to meet the hydraulic system a particular purpose, such as construction machinery on the buffer ring, high packing seal ring; altitude and safe operation of the special mechanical seals; temperature mechanical high-temperature and low-temperature mechanical seals on cold seal; pressure rotary machine, high pressure seals, etc., these products are not included in this catalog.
About general machinery: general machinery is referred to here in the general pressure, speed, temperature rating and other occasions using hydraulic machinery and equipment, its system security, and operational characteristics such tasks is not very special requirements, so the use of seal products will not make excessive performance requirements, such as general hydraulic machines, general machine tools, forklifts, plastic machines and light industrial machinery.
About the specialized machinery: specialized machinery is referred to here in particular pressure, speed, temperature class and special occasions the professional application of hydraulic machinery and equipment, its system security, work tasks, operating characteristics, environmental conditions, etc. have a certain expertise requirements, so that it can effectively accomplish specific tasks assigned, so the use of this type of mechanical security seals products have a special performance requirements of certain aspects (particularly if the reliability of pressure resistance, speed, performance, temperature performance, durability performance and safety, etc.), this type of machinery such as aerial work machinery, cranes, mining machinery, steel, machinery, port machinery and some maintenance equipment.
About maintenance products: Is the mechanical equipment being used when there is hydraulic system failure, urgent need to replace the hydraulic seals, hydraulic equipment needed or when the system transformation, re-select the proper application of seals. The supply of these products feature requires timely, accurate, effective and reliable.
About ancillary products: processing in the factory production of hydraulic system and hydraulic cylinders, you need to use the technical, performance, quality, standards, cost, delivery period, etc. to demonstrate selected so that the hydraulic equipment to meet the advanced technology, reliable performance, cost reasonable, timely delivery, after-sales service and easy. This is a very rigorous system works, over the years our company has been in line with industrial enterprises one after another sealing systems supporting business.
About Machine Repair Kit: the hydraulic system of the mechanical equipment of a component or unit body for maintenance, the need to replace the seal assembly parts, so that the mechanical Security seals replacement system has been repaired its performance back to its normal state, such unit supply The seal assembly is called machine repair kits. Machine repairs within the package seals must fully meet the original parts of the technical and performance requirements in order to make the repaired machine into normal use.
About general machinery: general machinery is referred to here in the general pressure, speed, temperature rating and other occasions using hydraulic machinery and equipment, its system security, and operational characteristics such tasks is not very special requirements, so the use of seal products will not make excessive performance requirements, such as general hydraulic machines, general machine tools, forklifts, plastic machines and light industrial machinery.
About the specialized machinery: specialized machinery is referred to here in particular pressure, speed, temperature class and special occasions the professional application of hydraulic machinery and equipment, its system security, work tasks, operating characteristics, environmental conditions, etc. have a certain expertise requirements, so that it can effectively accomplish specific tasks assigned, so the use of this type of mechanical security seals products have a special performance requirements of certain aspects (particularly if the reliability of pressure resistance, speed, performance, temperature performance, durability performance and safety, etc.), this type of machinery such as aerial work machinery, cranes, mining machinery, steel, machinery, port machinery and some maintenance equipment.
About maintenance products: Is the mechanical equipment being used when there is hydraulic system failure, urgent need to replace the hydraulic seals, hydraulic equipment needed or when the system transformation, re-select the proper application of seals. The supply of these products feature requires timely, accurate, effective and reliable.
About ancillary products: processing in the factory production of hydraulic system and hydraulic cylinders, you need to use the technical, performance, quality, standards, cost, delivery period, etc. to demonstrate selected so that the hydraulic equipment to meet the advanced technology, reliable performance, cost reasonable, timely delivery, after-sales service and easy. This is a very rigorous system works, over the years our company has been in line with industrial enterprises one after another sealing systems supporting business.
About Machine Repair Kit: the hydraulic system of the mechanical equipment of a component or unit body for maintenance, the need to replace the seal assembly parts, so that the mechanical Security seals replacement system has been repaired its performance back to its normal state, such unit supply The seal assembly is called machine repair kits. Machine repairs within the package seals must fully meet the original parts of the technical and performance requirements in order to make the repaired machine into normal use.
2013年8月8日星期四
No-contact gas lubricated mechanical seals is how to work it
In operation, the gas-lubricated mechanical seal without contact between the sliding surfaces of the two should be a layer of only a few voids Xie meter, in order to produce voids, non-contact type mechanical seal of the two sliding surfaces disengage one another . To achieve this, a three-dimensional ring groove made to ensure that the air is static and dynamic play. Seal in the stuffing box pressure difference generated at the aerostatic effect, while the rotation of the aerodynamic effect. The resulting force balance lift and closed, thereby forming a width of 1 to 5 Xie seal gap.
Applied in the mixer without touching gas lubricated mechanical seals
The gas in the mixer using the non-contact type mechanical truck security seals for the user has three major advantages: 1, no liquid leakage; 2, the product quality is not affected; 3, on the reaction with little or no effect;
Non-contact type mechanical seal also has some other advantages. Include: 1, the operation clean (GMP); 2, low friction loss; 3, the noise does not occur; 4, mechanical wear little or no wear. If the seal system used in the mixer for the above requirements, then such seal member is operable.
Pressure purposes, without contacting mechanical seals are usually used in vacuum conditions, up to 6bar.
Mechanical seal according to the user part of the liquid lubricated seal for many years experience in the use of liquid seal is not used in the past for each of the products are suitable for gas seals. The main factors to consider for sealing products with high sensitivity (eg, sealing surface is touched). To counteract this effect, many types of research and the use of additional components, such as the patented flush mounting flange. When not contact mechanical seal sealing surface when the automatic alignment feature degradation, self-converted to gas consumption, the sealing surface is blown or is rinse. The mounting flange can be used for washing steel container, especially for the enamel container (plastic container). Apart from the gas seal applications beyond the experience gained in the storage and use has also made a series of new insights. When the seal member to achieve its first time of change, and start using the ship between the seal member, may be after many years. Same time, various factors can influence the characteristics of the gas mechanical security seals member. In the assembly accidentally add too much grease or oil - grease or oil into or penetrate into the sealing gap. Then, in use, thereby causing uneven gap, mechanical seal damage. According to experience mechanical seal at its beginning before use should be checked.
Applied in the mixer without touching gas lubricated mechanical seals
The gas in the mixer using the non-contact type mechanical truck security seals for the user has three major advantages: 1, no liquid leakage; 2, the product quality is not affected; 3, on the reaction with little or no effect;
Non-contact type mechanical seal also has some other advantages. Include: 1, the operation clean (GMP); 2, low friction loss; 3, the noise does not occur; 4, mechanical wear little or no wear. If the seal system used in the mixer for the above requirements, then such seal member is operable.
Pressure purposes, without contacting mechanical seals are usually used in vacuum conditions, up to 6bar.
Mechanical seal according to the user part of the liquid lubricated seal for many years experience in the use of liquid seal is not used in the past for each of the products are suitable for gas seals. The main factors to consider for sealing products with high sensitivity (eg, sealing surface is touched). To counteract this effect, many types of research and the use of additional components, such as the patented flush mounting flange. When not contact mechanical seal sealing surface when the automatic alignment feature degradation, self-converted to gas consumption, the sealing surface is blown or is rinse. The mounting flange can be used for washing steel container, especially for the enamel container (plastic container). Apart from the gas seal applications beyond the experience gained in the storage and use has also made a series of new insights. When the seal member to achieve its first time of change, and start using the ship between the seal member, may be after many years. Same time, various factors can influence the characteristics of the gas mechanical security seals member. In the assembly accidentally add too much grease or oil - grease or oil into or penetrate into the sealing gap. Then, in use, thereby causing uneven gap, mechanical seal damage. According to experience mechanical seal at its beginning before use should be checked.
2013年8月5日星期一
Non-contact gas lubricated mechanical seals use
When discussing the mechanical seal, the most important thing is to figure out the differences between various sealing systems. Mechanical seals are three basic types: fluid lubricated mechanical seals, gas lubricated mechanical seals and touch off style or called non-contact gas lubricated mechanical seals.
These types of mechanical seals difference is in the fluid-lubricated sliding surface of the seal between the fluids. These seals are usually applied mixed friction purpose mixer. For dry running seals, two sliding surfaces in direct contact with each other. On the other hand, the non-contact gas-lubricated mechanical seals, in the operation of the sliding surface is not in direct contact. There are 1 ~ 5μm wide gap separating the surface, which is why this is often referred to as the seal seals from seal causes. When referred to the gas damping double seals should have this distinction. Here we will discuss only non-contact gas lubricated mechanical gas plastic truck seals.
No-contact gas lubricated mechanical seals is how to work it?
In operation, the gas-lubricated mechanical security seals without contact between the sliding surfaces of the two should be a layer of only a few voids Xie meter, in order to produce voids, non-contact type mechanical seal of the two sliding surfaces disengage one another . To achieve this, a three-dimensional ring groove made to ensure that the air is static and dynamic play. Seal in the stuffing box pressure difference generated at the aerostatic effect, while the aerodynamic effects generated by the rotation. The resulting force balance lift and closed, thereby forming a width of 1 to 5 Xie seal gap.
These types of mechanical seals difference is in the fluid-lubricated sliding surface of the seal between the fluids. These seals are usually applied mixed friction purpose mixer. For dry running seals, two sliding surfaces in direct contact with each other. On the other hand, the non-contact gas-lubricated mechanical seals, in the operation of the sliding surface is not in direct contact. There are 1 ~ 5μm wide gap separating the surface, which is why this is often referred to as the seal seals from seal causes. When referred to the gas damping double seals should have this distinction. Here we will discuss only non-contact gas lubricated mechanical gas plastic truck seals.
No-contact gas lubricated mechanical seals is how to work it?
In operation, the gas-lubricated mechanical security seals without contact between the sliding surfaces of the two should be a layer of only a few voids Xie meter, in order to produce voids, non-contact type mechanical seal of the two sliding surfaces disengage one another . To achieve this, a three-dimensional ring groove made to ensure that the air is static and dynamic play. Seal in the stuffing box pressure difference generated at the aerostatic effect, while the aerodynamic effects generated by the rotation. The resulting force balance lift and closed, thereby forming a width of 1 to 5 Xie seal gap.
2013年8月4日星期日
The role of valve seals
You can prevent the oil into the intake and exhaust pipes, resulting in loss of engine oil, gasoline and air mixture to prevent gases and emissions leakage, prevent engine oil into the engine combustion chamber. Engine valve valve padlock seals is one of the important parts group, at a high temperature in contact with gasoline and oil. Therefore requires the use of heat resistance and oil resistance of the material, generally made of rubber is a fluorine.
Valve seal structure
Installation and replacement of valve seals
(A) the valve stem oil seal removal steps:
① Remove the camshaft and hydraulic lifters, and kept face down, the operation should note tappets are not interchangeable. Remove the spark plug with a spark plug wrench 3122B, adjusted to the corresponding cylinder piston top dead center, the pressure hose VW653 / 3 spark plug screwed into the threaded hole.
② the spring compression tool with bolts attached to the cylinder head 3362. The associated valve adjusted to the correct position, and then the pressure hose to the air compressor (air pressure of at least 600KPA). Threaded mandrel and thrust pieces down the pressure valve spring, remove the spring.
③ can tap Remove the air lock valve spring retainer block. Tools pull valve stem seals 3364.
(2) the installation of the valve stem seals.
The plastic package to the valve stem to prevent damage to the new valve stem seals. Kouqing coated in oil plastic strap seal lip. The 3365 oil on package to the tool, and then slowly push the valve conduits. Special note: Install the intake and exhaust in front of the valve stem must be coated with a layer of oil.
Valve seal structure
Installation and replacement of valve seals
(A) the valve stem oil seal removal steps:
① Remove the camshaft and hydraulic lifters, and kept face down, the operation should note tappets are not interchangeable. Remove the spark plug with a spark plug wrench 3122B, adjusted to the corresponding cylinder piston top dead center, the pressure hose VW653 / 3 spark plug screwed into the threaded hole.
② the spring compression tool with bolts attached to the cylinder head 3362. The associated valve adjusted to the correct position, and then the pressure hose to the air compressor (air pressure of at least 600KPA). Threaded mandrel and thrust pieces down the pressure valve spring, remove the spring.
③ can tap Remove the air lock valve spring retainer block. Tools pull valve stem seals 3364.
(2) the installation of the valve stem seals.
The plastic package to the valve stem to prevent damage to the new valve stem seals. Kouqing coated in oil plastic strap seal lip. The 3365 oil on package to the tool, and then slowly push the valve conduits. Special note: Install the intake and exhaust in front of the valve stem must be coated with a layer of oil.
2013年7月28日星期日
Six Reasons to transformer oil leakage
China's power transformer, mostly oil-immersed transformers, transformer oil leakage phenomenon over the years have occurred, serious leakage not only reduces the transformer life, affect the system safe and stable operation, but also the social and economic benefits resulting user seriously affected. In recent years, our main transformer and the various power plants change during overhaul, transformer oil leakage found the following reasons:
1, rubber seal failure and weld cracking
Transformer pads and more, weld length, while the oil-immersed transformer is welded steel shell-based collection of a variety of welding and connection. A total 31500kVA transformers are more than 70 joints, weld total length of nearly 20m or so, so leakage pathways may be large. Direct cause of leakage is rubber seal failure and weld cracking, porosity, slag, etc.
2, sealants member aging, cracking, deformation
Transformer leakage occurred in the junction, while more than 95% was mainly caused by the sealant member. The quality of the sealant member depends on its oil resistance, poor oil resistance, aging fast speed, particularly at high temperatures, the aging rate is faster, easily cause numbered seals aging, cracking, metamorphism, deformation, and even failure, resulting in transformer oil leakage.
3, the transformer manufacturing quality
Transformer in the manufacturing process, multi-tank joints, weld length, welding difficult, welding materials, welding (welding equipment classification characteristics) specification, process, technology, and this will affect the quality of welding, causing air hole, Weld, Desoldering phenomenon so that the transformer oil leakage.
4, plate butterfly poor quality
Another transformer leakage often occurs at the site of the valve plate, earlier production of transformers, the use of ordinary laminated valve connection surface is rough, thin, single seal, is out of product, can easily cause the transformer oil leakage.
5, improper installation
Uneven flange connections, the installation gasket four weeks not even by force; artificially bolt gasket four weeks non-uniform force; flange joint dislocation deformation, so that the force is too large security tie on one side, the side of the force is too small, side of the force is too small because of the amount of compression seal is easy to cause less leakage. This phenomenon occurred in the Buchholz relay connections and the radiator and body connections; Another point is that when installing the gasket, the compression is insufficient or too large, the amount of compression is low, the transformer operating temperature oil thinning, resulting in transformer permeability, the amount of compression is too large, the gasket deformation serious, accelerated aging shorten life.
6, shipping improper
Shipping and construction components during transport collision and improper lifting and transportation, causing bruises deformed parts, weld open welding, cracks, etc., causing leakage.
1, rubber seal failure and weld cracking
Transformer pads and more, weld length, while the oil-immersed transformer is welded steel shell-based collection of a variety of welding and connection. A total 31500kVA transformers are more than 70 joints, weld total length of nearly 20m or so, so leakage pathways may be large. Direct cause of leakage is rubber seal failure and weld cracking, porosity, slag, etc.
2, sealants member aging, cracking, deformation
Transformer leakage occurred in the junction, while more than 95% was mainly caused by the sealant member. The quality of the sealant member depends on its oil resistance, poor oil resistance, aging fast speed, particularly at high temperatures, the aging rate is faster, easily cause numbered seals aging, cracking, metamorphism, deformation, and even failure, resulting in transformer oil leakage.
3, the transformer manufacturing quality
Transformer in the manufacturing process, multi-tank joints, weld length, welding difficult, welding materials, welding (welding equipment classification characteristics) specification, process, technology, and this will affect the quality of welding, causing air hole, Weld, Desoldering phenomenon so that the transformer oil leakage.
4, plate butterfly poor quality
Another transformer leakage often occurs at the site of the valve plate, earlier production of transformers, the use of ordinary laminated valve connection surface is rough, thin, single seal, is out of product, can easily cause the transformer oil leakage.
5, improper installation
Uneven flange connections, the installation gasket four weeks not even by force; artificially bolt gasket four weeks non-uniform force; flange joint dislocation deformation, so that the force is too large security tie on one side, the side of the force is too small, side of the force is too small because of the amount of compression seal is easy to cause less leakage. This phenomenon occurred in the Buchholz relay connections and the radiator and body connections; Another point is that when installing the gasket, the compression is insufficient or too large, the amount of compression is low, the transformer operating temperature oil thinning, resulting in transformer permeability, the amount of compression is too large, the gasket deformation serious, accelerated aging shorten life.
6, shipping improper
Shipping and construction components during transport collision and improper lifting and transportation, causing bruises deformed parts, weld open welding, cracks, etc., causing leakage.
2013年7月24日星期三
Vehicles require frequent replacement doors and windows sealed
The meter seal on the doors and windows use a long time, because of aging and deformation, cracking, this will greatly reduce the tightness, which appears sound effects decreased, air leakage, poor door shut, leaking, or even because of deformation hardening sealing strip damaged sunroof motor.
So how can we prevent these from happening? First, I observe the appearance of seals, when found cracks on the seal, it shows that he has reached the age of the need to replace the point, these small cracks sometimes not obviously, you need to be carefully observed. Then there is the touch, if you find seals begin stiff, rebound effect of variation, which is aging performance. Seals harden card bad sunroof motor, a great economic loss, if then drain flooded interiors that losses will increase exponentially, but largely due to the rebound effect of variation seal, causing the door not closed, in a moving the door to open their own, think about all that horror.
Do not underestimate any car parts, you know you sit in a high-speed machine which, any small mistake may have resulted in great harm.
Usually we can apply a layer of talcum powder seal, it helps seal dry, but also to extend bolt seal life.
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