DM brand butterfly valve Size: 2"--12" Interchangeable with Demco Model DM Butterfly Valve 1. Wherever face to face distance between flanges ... fluid, gas, powder, etc., in a variety of industries such as petroleum, chemical, metallurgy, power plant, food, medicine, textile, ... , Aluminum bronze Seat: EPDM, NBR, Viton Main Performances Nominal Pressure(lb): 50, 150 Nominal Diameter: 2 24 Joint type: ...