AWWA Wafer Butterfly Valve Size: DN50 to 3000 Temperature: -15℃ to 150℃ Pressure: 1.0MPa,1.6MPa Materials Materials of Body : Ductile Iron (GGG40, GGG50). Cast Iron (GG25), Stainless Steel Materials of Disc : Stainless Steel. Nickel Plated, Ductile Iron, Ductile Iron Coated Plastic, Titanium Steel, Copper Alloy etc Materials of Seat : Ethylene-Propylene-Diene Monomer (EPDM), Polytetrafluoroethylene […]