water butterfly valve: Size : 1" to 24" Body: Cast iron,Ductil ... .S304,S.S316Disc : Ductil iron,S.S304,S.S316 Casting Iron Water Butterfly Valve:1,30years focus on QA2,decades experience of ... : S.S416,S.S316,S.S304Seat : EPDM,PTFE,NBR,VITON Casting Iron Water Type Butterfly Valve