... : Ni coated ductile iron, Nylon coated ductile iron,SS304,SS316, aluminum bronze Shaft of valve : 20# steel,SS420,SS304&316 Seat ... ,NBR,PTFE,Viton Handle of valve : iron, punching malleable iron, aluminum handle Normal Diameter of valve: DN25- 300 Normal Pressure of ... name Material Body Cast iron, nodular cast iron, cast steel, alloy steel, stainless steel Disc Ball mill cast iron, stainless steel ...