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National Board Certified. Eliminates Hazards. Facilitates Compliance.

POP-EYE™

Designed to provide emergency relief from excessive pressure in refrigerant-containing vessels, these valves are built in strict conformance with ASME Boiler and Pressure Vessel Code requirements for safety relief devices. Each valve bears the ASME code symbol of certification (UV). Their capacities are rated by the National Board of Boiler and Pressure Vessel Inspectors. These tamper-resistant valves are accurately set and sealed by qualified technicians at the factory. POP-EYE lift detection is standard on all H56xx series valves and includes an on board, 360° bright LED to indicate when a relief valve has lifted.

  • Detects and indicates when a relief valve lifts

  • LED Indication:

    • Bright LED with 360° visibility

    • Battery operated, 7+ years life

    • Blinks for 2+ weeks after a lift

  • Not for retrofit on existing valves

  • No setup, calibration, or wiring required

  • No false detection

  • Valve is National Board Certified

    • No change in capacity ratings

    • No piping change

    • Drop in replacement for existing valves

  • Intended for one-time use

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Hansen pressure-relief valves help meet the requirements of ANSI/ASHRAE 15 Safety Standard for Refrigeration Systems as well as other worldwide codes. This standard requires pressure vessels of all refrigeration systems to be protected by a pressure-relief device or other
approved means to safely relieve pressure in the event of fire or other abnormal conditions. 

Once installed, a properly selected Hansen pressure-relief valve is ready to vent to atmosphere any temporary excessive overpressure inside of a vessel. After discharge, these valves will attempt to reseat to minimize loss of refrigerant. However, once any relief valve has discharged, it must be replaced as soon as possible because debris may have settled on the seat during discharge.