Butterfly valve, also called flap valve, is a simple structure of the regulating valve, can be used for low-pressure pipeline media switch control of the butterfly valve is the closing member (valve flap or butterfly plate) for the disc, rotating around the valve shaft to achieve the opening and closing of a valve. Valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil, liquid metal and radioactive media. In the pipeline mainly plays a cut-off and throttling role. Butterfly valve opening and closing member is a disc-shaped butterfly plate, in the valve body around its own axis rotation, so as to achieve the purpose of opening and closing or regulation.
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