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Cryogenic Relief Valve (Brass)

1/4", 3/8” and 1/2" NPT
10 - 750 Psig (0.7 - 51.7 Bar)


The Generant Series Brass CRV, Cryogenic Relief Valve is a spring reference over pressure protection device. The CRV incorporates Generant’s exclusive “Dirt Guard” feature which increases the valves ability to tolerate particulate contamination. This device is ideally suited for use as a “Blocked Line Safety” in cryogenic systems. The CRV is supplied cleaned and packaged for oxygen service. The valve can be ordered with set pressures ranging from 10 to 750 Psig (0.7 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 is supplied with Flourosilicone seals for set pressures from 10 – 49 Psig (0.7 – 3.4 Bar) and PCTFE seals for set pressures greater then 50 – 750 Psig (3.5 – 51.7 Bar)


  • Available CE marked in accordance to the requirements of the PED
  • Exclusive “Dirt Guard” poppet incorporates screen to extend valve and reliability
  • High Flow Capacity and Excellent Reseal Performance
  • Supplied Factory Preset Set and Permanently Locked for Tamper Proof Service
  • Discharge to Atmosphere or a Wide Varity of Inline Piping Configurations
  • Optional Deflector Cap available for diverting exhausted gas
  • 100% Factory Tested for Leakage, Crack and Reseal
  • Cleaned and Packaged for Oxygen Service

Technical Data

  • Nominal Set Pressure Range: 10 – 750 Psig (0.7 to 51.7 Bar)
  • Factory Set Tolerance*:
    • Set Pressure ≤ 28.90 PSI, ± 5%
    • Set Pressure 29.00 – 48.30 PSI, ± 1.45 PSI
    • Set Pressure ≥ 48.40 PSI, ± 3%
      *tolerance specifications per EN ISO 4126-1.
  • Zero Leakage to 95% of Set Pressure
  • Full Rated Flow @ 110% of Set Pressure
    • Unaffected by up to 10% Back Pressure
  • Reseat:
    • 90% of set pressure
    • 85% for PCTFE seals set below 100 Psig (6.9 Bar)
  • Temperature Rating:
    • -320º to 350º F (-196º C to 176º C)
      based on seal material (see How To Order)
  • Lubricant: Krytox®

Materials of Construction

Dimensional Data

Flow Data

How to Order

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.

For Instructions on How to Select Your Model, click here.

Cryogenic Relief Valve
ModelSizeFile TypeDownload
CRV-250B1/4" NPTSTEP Download
CRV-375B3/8" NPTSTEP Download
CRV-500B1/2" NPTSTEP Download

CRV without Drain Hole
ModelSizeFile TypeDownload
CRVP-250B1/4" NPTSTEP Download
CRVP-375B3/8" NPTSTEP Download
CRVP-500B1/2" NPTSTEP Download

CRV with 1/4" Female Pipe-A-Way Adapter Installed
ModelSizeFile TypeDownload
CRVP2-250B1/4" NPTSTEP Download

CRV with 3/8" Female Pipe-A-Way Adapter Installed
ModelSizeFile TypeDownload
CRVP3-250B1/4" NPTSTEP Download
CRVP3-375B3/8" NPTSTEP Download

CRV with 1/2" Female Pipe-A-Way Adapter Installed
ModelSizeFile TypeDownload
CRVP4-250B1/4" NPTSTEP Download
CRVP4-375B3/8" NPTSTEP Download
CRVP4-500B1/2" NPTSTEP Download

CRV with Deflector Adapter Installed
ModelSizeFile TypeDownload
CRVD-250B1/4" NPTSTEP Download
CRVD-375B3/8" NPTSTEP Download
CRVD-500B1/2" NPTSTEP Download

CRV with 1/2" BSPT Female Pipe-A-Way Adapter Installed
ModelSizeFile TypeDownload
CRVB4-250B1/4" NPTSTEP Download
CRVB4-375B3/8" NPTSTEP Download
CRVB4-500B1/2" NPTSTEP Download