Ductile Iron Butterfly Valve, Butterfly Valve Flange Ends, Wafer Butterfly Valve manufacturer / supplier in China, offering GB, API, DIN, JIS SS304/ SS316 Wafer/Flange Butterfly Valve, Cast Iron/Ductile Iron Pn25 DN 300 Hydraulic Float Ball Valve, Welding Ball Valve/Long Stem Welding Ball Valve and so on.