Butterfly Valve, Gate Valve, Check Valve manufacturer / supplier in China, offering OEM DN40-300 Double Orifice Air Valve with Three Function Use Water Pn16 Factory Air Release Valve, Ductile Iron Check Valve Operation Wafer Lug Flanged Relsient Seat EPDM Manual Water Butterfly Valve, DN 50 Ductile Cast Iron Ggg 50 Wcb Flanged End Water Wafer Industrial Valve Lift Swing Check Valve and so on.