... 2"-48" Standard: ANSI, BS, DIN Material: Cast Iron, Ductile Iron, SS, WCB Certification: ISO, CE Doubel Flanged Butterfly ... ) Body: cast iron, ductile iron, carbon steel (WCB), stainless steel3) Disc: ductile iron, SS304, SS316, bronze, ductile iron with nylon coated4) Seat ... : EPDM, NB, BUNA-N, PTFE, VITON 5) Stem: SS410, SS416, SS304, SS316, carbon steel (WCB)6) Pin ...