... 2) Materials: body-CI, DI, WCB, stainless steel disc-DI, CF8, CF8M, C954 steel Wafer Butterfly Valve SizeDN40 - DN500Design StandardAPI 609End ... , API 609Top flangeISO 5211 BodyDuctile iron,Stainless steel,WCBDiscDuctile iron,CF8,CF8M,C95400Stem416,420,431,316SeatNBR,EPDMSuitale mediumSewage, Sea water, Air ...