Butterfly Valve, Flange Adaptor, Dismantling Joint manufacturer / supplier in China, offering Dual Plate Check Valve for Mounting Directly Between Flanges According to DIN, Factory Manufacturer Ci/Di DN 50 - DN 300 Silent Check Valve-Aocv23, Pn10/Pn16 Lug Type Butterfly Valve with Rubber Seated and so on.