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