Profile: Marshalsea Hydraulics Ltd. is a provider of high pressure stainless steel fluid power equipment to the international offshore oil and gas industry. Our products include pumps & motor pump units, pressure intensifiers, and valves. Our valves include relief valves, thermal relief, directional valves, slide, valves, and shutdown & lockout relay. Our high pressure hydraulic pump is designed for water, so it can operate with a wide range of fluids. Pumped fluid is separated from lubricating oil by special cavity. Our relief valves have been developed to directly replace with a single unit, separate check and thermal relief valves used in wellhead control systems.