New technologies spherical diaphragm seal

With the petrochemical and coal chemical industry, high temperature, high pressure, medium and large-diameter high-risk, high flow heat exchangers such high-parameters in the device more and more applications, the traditional port sealing technology is facing new challenges. For example, the high temperature and pressure critical hydrogen exchanger tube box sealing device using a variety of structures, from the traditional long-necked flanges threaded locking ring seal structure to simplify its internal and external laps bolt seal structure, then Ω-ring seal structure, leakage occurred through the tube box case.
If the combination of these two advantages of the traditional structure, the diaphragm seal welded security seals and integration of the spherical diaphragm seal technology for high-parameter heat exchanger tube ends ports sealed container, it should obtain a simple structure, reliable sealing effect.
Conventional welding seal not often used in harsh conditions, removal of the flange joints, may be placed gaskets, simple structure, which does not belong to the structure of gasket pressure than more securely seal suitable for high temperature operation or temperature variation in a heat exchanger. On the other hand, the diaphragm seals in valves and pipe fittings in their long history, technology and reliable.
Diaphragm seal technology reduces spherical sealing surface, welded seal and reliable, and the middle part of the diaphragm has a certain elasticity, elastic deformation of the protective seal (truck seal)welding. Simple structure. Manufacture, installation cycle is short, simple maintenance and low total cost. In addition, generally used in austenitic stainless steel spherical diaphragm, on certain media can also play a role in the corrosion lining.
But at the same time, pointed out that the spherical diaphragm seal is a relatively new sealing technology structure, although foreign countries have good engineering applications, but Chinese domestic understanding and application of the technology has just started, it needs to further understanding and knowledge.