in the past, the gate valve used in the water supply piping system of our country is mostly iron gate valve flange connection, but with the strengthening of environmental protection control and improvement of their own health consciousness, the secondary pollution of drinking water problem more and more get the attention of people, the reform of water supply system is imperative. Newly developed soft-sealing gate valve, the sealing structure according to the flange connected to the iron gate, drive form for manual. To various parts of the valve and connection parts machining, valve body cavity to keep the casting surface. Sealed by rubber gate valve and valve body cavity of the sealed wedge. Since it is wedge, in a fixed ratio pressure conditions, more work needs to be done, torque ( Less than the iron wedge gate valves) In order to ensure zero leakage of the valve. Bonnet and body connection and sealing form refers to the iron gate, bolt connection, rubber gasket seal. Because of using intermediate flange rubber flat gasket seal when assembly so requires bolt fastening force uniform, lest because of its high internal pressure, rubber gasket stress caused by uneven valve leakage. Due to valve parts are separated, the parts of connection part is processing, so to ensure the mechanical reliability of the valve. Produced by the valve of large diameter soft-sealing gate valve made of nodular cast iron or carbon steel with high strength, light weight, small geometrical dimension, etc. The door has the function of interchangeable. It can be installed save Labour institutions of spiral bevel gears, a person can easily switch, or can be installed opening and closing instructions column, or according to the requirements of users to install the electric and pneumatic actuators. Sealed rust-proof function, reliable and long service life. Can be installed in vertical or horizontal, which are widely used in water supply and drainage system, sewage system, municipal construction, mining, metallurgical, power plants and other industries.

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