Cast Iron Wafer Handle Single Stem Butterfly Valve DN40-600,PN10/16; ... /150Material of main parts:Body: Cast iron, ductile iron, stainless steel, cast steel (WCB)Disc: Monel, ductile iron, stainless steel, ductile iron with nylon coatedSeat: EPDM or ... materials about body, plate and stem, such as ductile iron, cast steel, stainless steel 304,316,316L according to special working condition.4 ...