www.hpmag.co.uk HYDRAULICS & PNEUMATICS March 2025 29 In certain applications, two pressure relief valves can be arranged in series to effectively double the overall cracking pressure. For example, using two 5,000 psid valves in series results in a combined cracking pressure of 10,000 psid. This works because when the first valve begins to open, the downstream pressure remains insufficient to open the second valve. The pressure equalises on the back of the first valve, causing its spring to resist further opening. Only when the pressure increases to the sum of both valves’ cracking pressures do both valves open simultaneously, with each experiencing its own pressure drop. This method is particularly useful in the design of downhole oil tools, where precise pressure control is critical. The Lee Company manufactures 0.281-inch diameter high-pressure relief valves with cracking pressures of up to 5,900 psid. When used in series, these valves can achieve a combined cracking pressure as high as 11,800 psid. For ease of installation, both valves can be housed within the same mounting hole using a Dual Insert Adaptor, as detailed on page N25 of the 12th Edition of the Lee Technical Hydraulic Handbook. For further information please visit: https://www.theleeco.com/industries/oilgas/products/pressure-relief-valves/ Using pressure relief valves in series to increase cracking pressure UK Official Distributor Since 1983 Pumps & Pumping Equipment Cleaning Equipment Hose & Hose Reels Fluid Handling Components Fittings, Connectors & Filters Spraying & Watering Engines, Motors & Generators Follow / Like / Subscribe 2025 celebrating 1975 www.dualpumps.co.uk Tel: 01664 567226 • Email: info@dualpumps.co.uk 1975 - 2025 Dependable Under Pressure ITALY 100% MADE IN Dual Pumps 178x124 March.indd 1 17/03/2025 11:41:48
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