high-performance butterfly valve 1.medium:water,oil,vapour 2.DN50-DN1200 3.ISO9001:2008 4.material:WCB or S.S.304,316 Name:ValvesMaterials : 1.Body : Cast Iron , Ductile Iron , Bronze / Aluminum Iron, SS304 2.Disc : Cast Iron , Ductile Iron , Bronze , SS304 3.Seat : EPDM , PTFE , NBR , VITON . 4.Stem : Carbon Steel , Stainless SteelDesign standard: API609 , BS5155 , MSS-67-1995Face to face : ...