Rubber seat wafer butterfly valve 1. Size: DN50 - DN300, Pressure: PN10/ ... , ISO 5752, BS 5155, MSS SP-67.Flange Drilling: ANSI B 16.1, BS4504, DIN PN 10 / PN 16.Test: API ... light industry. Different Levers: NOTE: PLEASE CONTACT FOR MORE INFORMATION. Rubber seat wafer type butterfly valve with lever