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This valve is mounted on industrial piping to prevent the adverse flow of the medium and excessively large pressure when close the valve under adverse flow (water -hammer).
This kind of valve is automatic valve that is opened by medium pressure when the pump or blower is started and the weight hammer is lifted at the same time. The valve is closed by the adverse flow of medium and the weight hammer falling down, so as to prevent a great of medium flow into one side of pump or blower to make an accident.
This type are equipped with damping device the medium is oil. When valve is automatic closed, the damping device is used for damping. Two stages is divided when the disk is closed. It is quick closing stage from open stage 75°to 30°with little damping and then is slow closing stage with damp increased. The closing time could be adjusted by changing weight hammer position on the arm and regulating throttle plug.
Suitable medium: (cast iron) Water, sea water, sewage;(carbon steel and stainless steel) heat air, air with little dust, etc.
Type of sealing : soft sealing and hard sealing.
Type of control : automatic.
Material:grey cast iron, ductile cast iron, alloy cast iron, carbon steel, stainless steel, alloy steel.
Standard: GB, BS, ASME, JIS, DIN, EN, ISO and other country, also can be produced according to user’s requirements.