The DM Gate Valve, are solid gate, rising stem, gate valves with resilient seals. They are purpose made for mud, cement. ... 1. Designed specifically for Abrasive and Erosive use All Valves Have Stainless Steel Stems API 6A PSL 1, 2 and ... Chemicals Water Flood Lines Abrasive Drilling Mud DM brand gate valves(Interchangeable with Demco Model Gate Valve)