The LAKE DM Gate Valves are solid gate, rising stem, gate valves with resilient seals. They are purpose made for mud, cement, fracturing and water service and are easy to operate and simple to maintain. The DM Gate Valves with superior design features precision workmanship and a proven principle are engineered to meet the harsh drilling requirements in todayâ??s oilfield. DM Series Mud Gate Valves are designed and manufactured in accordance with the following specifications:- API 6A Specification for Wellhead and Christmas Tree Equipment. ANSI B31.3 Chemical Plant and Petroleum Refinery Piping. ASME VIII Boiler and Pressure Vessel Code. MSS-SP-55 Quality Standard for Steel Castings for Valve, Flanges and Fittings and Other Piping Components. NACE MR-01-75 Sulphide Stress Cracking Resistant Metallic Materials for Oilfield Equipment.