... DM brand butterfly valve Size: 2"--12" Interchangeable with Demco Model DM Butterfly Valve 1. Wherever face to face distance between ... power plant, food, medicine, textile, water Supplying/draining, paper making, ship building, environmental protection, etc. 3. Material List Body: 65 - 45 ... electrical, pneumatic, hydraulic DEMCO type Butterfly Valve(Interchangeable with Demco Model DM Butterfly Valve)