... Size: 2"--12" Interchangeable with Demco Model DM Butterfly Valve 1. Wherever face to face distance between flanges is limited, ... includes Wafer Butterfly Valve and Lug Butterfly Valve. Thank to its unique structure, it presents small weight, flow ... fluid, gas, powder, etc., in a variety of industries such as petroleum, chemical, metallurgy, power plant, food, medicine, textile, water Supplying/ ...