Working conditions of pneumatic pneumatic valve closing a sealing surface

the pneumatic valve application is very extensive, so the working conditions of the pneumatic valve sealing surface difference is very big. Can pressure from vacuum to ultra-high voltage, temperature can be from ℃ ℃, some working temperature can reach ℃, working medium from the corrosion medium to strong corrosive medium, such as all kinds of acid and alkali from the point of force of the sealing surface, it by extruding and shearing. From the point of view of friction science, grinding wear, corrosion and wear and surface fatigue wear, erosion and so on. Therefore, you should choose according to different working conditions that meet the needs of sealing surface material: ( ） The groove by loss of material in the form of debris or loose particles being pushed away from the surface of the things Hugh. （ ） Tinto metal surface grinding flat erosion corrosion produced when a layer of oxide, the oxide layer usually cover on the body parts from corrosion, so it can slow down further corrosion of metal. But if there is a sliding, will remove the surface of the oxide, make bare metal surfaces by further corrosion. （ ） Surface fatigue 'pick repeated cyclic loading and unloading surface or the lower surface causes fatigue crack, fragments and pits in the surface, eventually lead to the destruction of the surface. （ ） Erosion material loss ring is by sharp particle colliding objects, it is similar to abrasive wear, but the rough surface. （ ） Scratch scratch is refers to the sealing surface of relative movement in the process of material damage caused by friction.
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