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Butterfly double disc check valve automatically opens and closes the valve disc depending on the flow of medium itself, which is used to prevent medium backflow and aquatic hammer effect; 

The two valve discs rotate around the middle valve shaft, like two sliding doors, and are equipped with springs to boost the two valve discs to move in the direction of valve closing;

Butterfly check valve has simple structure, can only be installed on horizontal pipeline, and its sealing performance is relatively poor, and its sealing requirements are not high in use;