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Industrial Relief Valve (Brass)

1/4" - 1/2" NPT
10 - 750 Psig (0.69 - 51.7 Bar)


The Generant Series Brass IRV, Industrial Relief Valve is a spring reference over pressure protection device. The valve can be ordered with set pressures ranging from 10 to 750 Psig (0.69 to 51.7 Bar) and comes factory preset and permanently locked. Relief pressure cannot be altered or adjusted in the field. Seat and poppet geometry combined with optimized spring ranges provide high flow rates with minimum pressure accumulation. Relief pressure can be discharged to atmosphere or to a downstream connection. For severe service applications and set pressures above 50 Psig (3.45 Bar), specify optional PTFE seals.


  • Supplied Factory Preset Set and Permanently Locked for Tamper Proof Service
  • 100% Factory Tested for Leakage, Crack and Reseal Performance
  • High Flow Capacity and Excellent Reseal Performance
  • Discharge to Atmosphere or Inline Piping Configurations
  • Optional Deflector Cap available for Diverting Exhausted Gas to Atmosphere
  • Available Cleaned and Packaged for Oxygen Service

Technical Data

  • Set Pressure Range:
    • FKM and Fluorosilicone: 10 - 750 Psig (0.69 to 51.7 Bar)
    • PTFE and PCTFE: 50 - 750 Psig (3.45 to 51.7 Bar)
  • Factory Set Tolerance: +/- 5% of Specified Pressure
  • Zero Leakage to 95% of Set Pressure
  • Full Rated Flow @ 110% of Set Pressure, unaffected by up to 10% Back Pressure
  • Reseal:
    • 90% of Set Pressure
    • PTFE seals 80% of Set Pressure
  • Temperature Rating: -320º F to 375º F (-196º C to 190º C)
    • based on seal material (see How To Order)
  • Lubricant: Krytox®

Materials of Construction

Dimensional Data

Flow Data

Ordering Information

PROPER COMPONENT SELECTION - When specifying a component, the total system design must be considered to ensure safe and trouble-free performance. Intended component function, materials compatibility, pressure ratings, installation, environment and maintenance are the responsibility of the system designer.