How to choose the seals

Pressure
High and low pressure, the pressure variation cycle length, the seal is broken (such as extrusion) has a great influence. The higher the pressure, the sealing member other factors greater impact on the performance, such as temperature, speed, the bolt security seals material, the piston and the cylinder gap between the piston and the gap between the cylinder head.
Temperature
As a seal material to the maximum temperature and the minimum temperature is difficult to describe, because it is the result of the combined effects of a number of factors. The piston and rod temperature is different, selected to distinguish them.
Friction
Fixed Length plastic seal and friction surface depends on many factors: the surface roughness, surface characteristics, pressure, media, temperature, material of the seal, the seal type and velocity.
Surface treatment
Experience has shown that the surface of the cylinder piston and piston rod seal life characteristics on has a very big impact. Surface roughness of the surface characteristics used to define the value of RA, RA is a surface shape of the arithmetic mean of the absolute deviation from the center line. However, these values ​​can not be fully expressed on the surface condition of the seal, because even in the same roughness, different characteristics of the surface shape of the seal may lead to different levels of wear of the sealing member.
Analysis of the above points, choose a more scientific seal selection, the entire hydraulic system is of crucial importance to play a role.