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Emergency Relief. ASME Certified. Tamper-Resistant.

Pressure Relief Valves

Designed to provide emergency relief from excessive pressure in refrigerant-containing vessels, they 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.
  • Body: Ductile iron, ASTM A395 (with ACT® Coating)
  • Piston: Stainless steel
  • Spring: Stainless steel
  • Seat Insert: Stainless steel
  • Seat Discs: Premium grade virgin Teflon® (PTFE)
  • Cap: Steel (with ACT® Coating), Clear polycarbonate lens cap
  • O-ring: Neoprene
  • Electrical: 3.3VDC sealed battery, NEMA 4 rating, red LED light
  • Maximum Temperature Rating: 240˚F (115˚C)
  • Safe Working Pressure: 400 psig (28 bar)
  • Setting Range: 150 to 400 psig (10.4 to 28 bar)
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Applications

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.

Hansen pressure-relief valves should be connected to the vapor space of refrigerant vessels, heat exchangers, oil pots, oil stills, pilot receivers, and elsewhere as may be required by various codes.