The HPRV Series Relief Valve provides accurate crack pressure with zero leakage up to 98% of nominal set pressure. When properly specified, this factory preset, tamper proof design, is ideally suited for most any liquid or gas application. Encapsulating the O’ring seal within the poppet eliminates seal extrusion and cold flow characteristics. By guiding the poppet into the body, a line of contact seal is ensured and at high crack pressure settings, the O’ring is protected by a metal-to-metal stop between the poppet and the body. High flow design, combined with narrow band interchangeable springs, minimizes system pressure rise as flow demand increases. Available in brass, carbon or stainless steel, inline or discharge to atmosphere. Valves can be supplied with a manual pull ring override.

Technical Data

• Set Pressure Range: 10 to 2400 Psig (0.7 to 166bar)

• Set Pressure Tolerance: Factory Preset +/-5% on   increasing pressure

• Reseal: Elastomer Seals 90% - 95% of Actual Crack Pressure, Teflon™ may be slightly lower

• Inline Valves (Series HPRV)

• Proof Pressure: 3700 Psig (225 bar)

• Burst Pressure: >5000 Psig (345 bar

• Temperature Range: -320ºF to 400ºF (-220ºC to 205ºC) Based on seal selection, see ordering information

Features and Benefits

• 100% Factory Preset and Tested

• Zero Leakage to 95 - 98% of Set Pressure

• Tamper Proof Adjustment

• Excellent Reseal Performance

Materials of Construction

Dimensional Data

Ordering Information