"Pneumatic Hydraulic safety valve" is now widely used in hydraulic power systems and hydraulic equipment china valvesafety devices can, however, be limited pressure device, is a special valves, it is different from traditional valves, metal traditional mechanical valve spring as a driving force, can only be limited in low pressure, encountered more than 10 MPa more pressure limits pressure, can only do increase the volume of pressurized design, the traditional role of the high-pressure valve and the ultra-high pressure hydraulic power systems and hydraulic equipment when the inevitable pressure limiting volume bulky, complex structures, and create great Cast Steel Valvedifficulty, high cost products; the use of metal in the course of the spring changes in fatigue limit Ambassador pressure parameter fluctuations, should regularly adjusted to ensure normal use. Because of the spring steel material can not be used, such as stainless steel anti-corrosion material, anti-corrosion products is poor, valves life not long. Ball valve

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