Wafer Type Buttefly Valve 1.Size: DN40 to DN300 2.Body: ... : DI SS Aluminum bronze 4.Seat: NBR EPDM VITON PTFE Wafer Type Buttefly Valve 1.Size: DN40 to DN3002.Body: CI ... , food, medicine, acids, alkalis, salts, paper making etc. worm gear wafer butterfly valves