Butterfly Valve, Flange Adaptor, Dismantling Joint manufacturer / supplier in China, offering DN50-DN500 High Quality Product Flange Type Static Balancing Valve, High Quality DIN3202-K4 Stainless Steel Industrial Water Wafer Type Spring Swing Check Valve, Stainless Steel / Ductile Iron Wafer Dual Plate Butterfly Check Valve and so on.