GB/T3037-2017 Double eccentric butterfly valve 

Butterfly Valve is also called flap valve. Double Flange Butterfly Valve is a regulating valve with simple structure. High Performance Butterfly Valve can be used for medium switching control in low pressure pipeline. Double Eccentric Butterfly Valve refers to a valve whose closing part (disc or butterfly plate) is a disc and rotates around the valve shaft to open and close. The Butterfly Valve can be used to control the flow of various fluids, such as air, water, steam, various corrosive media, mud, petroleum products, liquid metals and radioactive media. It mainly cuts off and throttles the pipeline. The opening and closing part of the butterfly valve is a disc shaped butterfly plate, which rotates around its axis in the valve body to achieve the purpose of opening, closing or adjusting.

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