wafer check valve 1.Size:DN40~DN600mm 2.Material:cast iron/ductile iron/SS316 3.Valve disc:ss316/steel 4.ISO9001,CE Approved ... °c/VITON:-23°c~+150°c/8.MATERIALS LIST BodyCast iron GG25Ductile Iron GGG40Stainless Steel CF8M/SS316SteelDiscStainless Steel SS316/SS304AL BronzeCarbon SteelSeat ... 9.Medium:Fresh water ,sea water ,waste water,food stuff,steam,all kinds of oil,all kinds lf acid and alkaline ...