Hydraulic relief valve 281 High Pressure PRI®

fluidshut-off

This direct-acting valve is ideally suited for high pressure hydraulic applications (up to 5000 psi) where a fast opening safety relief valve is needed to prevent system damage from pressure spikes. Minimum cracking pressures are available from 3000-5900 psid. An integral safety screen is available for added protection.High Pressure Relief ValveDiameter: 0.281 inchesFull Open Lohm Rate: 1500 Lohms maxNominal System Pressure: Up to 5000 psiCracking Pressure Range: 3000 to 5900 psiCharacteristicSpecificationLeakage at Minimum Cracking Pressure10 Drops / Minute MaximumLeakage at Shutoff10 Drops / Minute MaximumScreen Hole Size0.004 inches NominalNominal System Pressureup to 5000 psiSystem Peak Pressure7500 psi MaximumNominal Weight6.0 gramsTest FluidMIL-PRF-83282 at 85°FMaterialsPARTMATERIALSPECIFICATIONBody15-5PH CRESAMS 5659Pin15-5PH CRESAMS 5659Seat440C CRESAMS 5630BallTungsten Carbide-Spring Seat303 CRESQQ-S-763CTube17-4PH CRESAMS 5643Ball Follower303 CRESQQ-S-763CSpring17-7PH CRESAMS 5678Screen304L CRESASTM A 666Braze-AMS 4774Finish: All CRES parts passivated.Pins are prewaxed. Do not degrease. Do not lubricate.Replacement Parts & AccessoriesPART NUMBERDESCRIPTIONCUTA2810114CInstallation / Extraction Tool SetSHBA2810003AReplacement PinKey Product FactsHigh Pressure Relief ValveDiameter: 0.281 inchesFull Open Lohm Rate: 1500 Lohms maxNominal System Pressure: Up to 5000 psiCracking Pressure Range: 3000 to 5900 psiPart Numbers & SpecificationsPART NUMBERFLOW DIRECTIONMINIMUM CRACKING PRESSURE (psid)FLOW POINT LOHM RATEFLOW POINT MINIMUM FLOW (gpm)FLOW POINT AT (psid)MINIMUM SHUT-OFF PRESSURE (psid)PHFA2815300DForward300015000.936002850PHFA2815320DForward320015000.938503000PHFA2815340DForward340015000.9540503200PHFA2815420DForward42001500147503700PHFA2815450DForward45001500151004000PHFA2815470DForward470015001.153004200PHFA2815520DForward520015001.158004550PHFA2815570DForward570015001.263505000PHFA2815590DForward590015001.266005200PHRA2815300DReverse300015000.936002850PHRA2815320DReverse320015000.938503000PHRA2815340DReverse340015000.9540503200PHRA2815420DReverse42001500147503700PHRA2815450DReverse45001500151004000PHRA2815470DReverse470015001.153004200PHRA2815520DReverse520015001.158004550PHRA2815570DReverse570015001.263505000PHRA2815590DReverse590015001.266005200Flow Curve, Cross Section, Dimensional, and Installation Hole Views available in image gallery.Finish: All CRES parts passivated.Pins are prewaxed. Do not degrease. Do not lubricate.Technical/Performance CharacteristicsDirect-acting, fast opening safety relief valveHydraulic applications up to 5000 psiMinimum cracking pressure: 3000-5900 psidIntegral safety screen availableNominal weight: 6.0 gramsSystem peak pressure: 7500 psi maxScreen hole size: 0.004 inches nominalTest fluid: MIL-PRF-83282 at 85°F