... 3.Disc: DI WCB SS 4.Stem: SS Double Eccentric Butterfly Valve 1.Size: DN50 to DN30002.Body: WCB SS3.Disc ... Penumatic Electric 9.Flange drilling standard: as per your request Butterfly valves can operate for more than 10,000 cycles and still ... .Suitable for control of water, seawater, sewage, oil, air, vapor, food, medicine, acids, alkalis, salts, paper making etc. Double Eccentric Butterfly Valve