... DI 3.Disc: CI DI WCB SS Aluminum bronze U type Butterfly Valve1.Size: DN700 to DN12002.Body: CI DI3.Disc ... tight" shut off. Long service life, free passage, low resistance coefficient.Suitable for control of water, seawater, sewage, oil, air, vapor ... , acids, alkalis, salts, paper making etc. Flanged Butterfly Valve-U type