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Cryogenic Relief Valve (Stainless)

1/4" and 1/2" NPT
-4 and -8 Metal To Metal Face Seal
1/4" and 1/2" Bi-Lok Dual Ferrule Tube
10 - 750 Psig (0.69 - 51.7 Bar)


The Generant Series Stainless Steel CRV, Cryogenic Relief Valve is a spring reference over pressure protection device. The Stainless CRV is supplied cleaned and packaged for oxygen service making it an ideal choice for most cryogenic relief valve applications. The valve can be ordered with set pressures ranging from 10 to 750 Psig (0.69 to 51.7 Bar) and come factory preset and permanently locked. Relief pressure can not be altered or adjusted in the field. Seat and poppet geometry combined with optimized spring ranges provide high flow rates with minimum pressure accumulation. Compact design and availability of a variety of inlet and outlet configurations reduces size and piping requirements. Relief pressure can be discharged to atmosphere or to a downstream connection. The CRV can be specified with PCTFE (set pressures above 50 Psig (3.54 Bar)), Viton®, and Fluorsilicone seals.


  • Available in NPT, Metal to Metal Face Seal and Bi-Lok Dual Ferrule Tube Connections
  • High Flow Capacity and Excellent Reseal Performance
  • Discharge to Atmosphere or a Wide Varity of Inline Piping Configurations
  • Supplied Factory Preset Set and Permanently Locked for Tamper Proof Service
  • 100% Factory Tested for Leakage, Crack and Reseal Performance
  • Optional Deflector Cap available for diverting exhausted gas
  • Cleaned and Packaged for Oxygen Service

Technical Data

  • Nominal Set Pressure Range: 10 – 750 Psig (0.69 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
  • Reseal: 90% (80% for PCTFE seals set below 100 psig (6.9 Bar))
  • Unaffected by up to 10% Back Pressure
  • Temperature Rating: -320º to 392º F (-196º C to 200º 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.