knife gate valve 1.Size: 2" to 40" (DN50 to DN1000) 2.Flange Drilled: BS, ANSI , DIN, AS, ISO, JIS,SANS etc. 3.Material: cast iron, ductile iron, cast steel, stainless steel ( 304/CF8, 316/CF8M, 304L/CF3, 316L/CF3M ) etc. 4.Seal: rubber ( NRB, EPDM, Viton, Buna,CR etc.), PTFE, metal