... 558-1, BS5155 , ISO 5752Top flangeISO 5211BodyDuctile iron,Stainless steel,WCBDiscDuctile iron,CF8,CF8M,C95400,C95500StemSS416,SS420,SS431,SS316SeatNBR,EPDMSuitale mediumSewage ... butterfly valves, check valves, gate valves and so on with the materials of ductile iron, carbon steel, stainless steel to order. Our products ... with the standards of GB, ASME, ANSI, API, BS, DIN Ductile iron Butterfly valve