Pneumatic valve and hydraulic valve seals the deficiencies have?

pneumatic valve and hydraulic valve seals are basically soft material such as plastic, rubber and metal hard material made of, and cooperate in general are cone sealing surface contact. This structure combination, make its if used in the valve opening and closing more frequently, medium containing hard and soft particle medium, makes the sealing face of the valve seat and valve plate appear relatively easy deformation, especially for soft materials, the probability of its deformation more faster, and eventually lead to seal failure so that the valve leakage. For example, a device using the pneumatic valve, the valve seat adopt stainless steel, the disc for fabric bakelite, medium for suspension with baking soda crystallization, its temperature is about degrees Celsius. During the period of use, the valve opening and closing is relatively frequent, sealing surface due to the frequent medium harder baking soda crystallization extrusion and friction, leakage soon appeared, basic is every three days need to replace the seat and disc.