... Butterfly Valve Size(mm): DN50-300 Nominal Pressure(MPa): 1.6 API, ASTM, ANSI, DIN, JIS, BS, ISO approved Grooved End Butterfly ... , oils, alkalis, salt, acids etc.3)Materials:Body : cast iron, ductile iron, stainless steel and carbon steelDisc: ALB, Monel, CF8M, WCB, ... Ductile Iron. Upper Stem: Cr13, SS416, SS316, Carbon SteelLower Stem: Cr13, SS416 ...