... stem, gate valves API6A standards. (Interchangeable with Demco Model DM Gate Valve)The DM Gate Valve, are solid gate, rising stem, gate ... and are easy to operate and simple to maintain.The DM Gate Valve, with superior design features precision workmanship and a ... Chemicals Drilling Chemicals Water Flood Lines Abrasive Drilling Mud. DEMCO DM GATE VALVE