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Cryogenic Relief Valve

Gas phase relief valve for cryogenic applications
5802040 shown

The Cryogenic Relief Valve is a spring-tensioned device that protects against over-pressure in cryogenic piping systems. Featuring a unique poppet screen that shields the valve from debris in the system, the cryogenic relief valve serves as a blocked line safety in cryogenic systems. The seat and poppet configuration combined with optimized spring ranges provides high flow capacity with minimum pressure accumulation. Designed for cryogenic inline systems, CONCOA offers the cryogenic relief valve with PTFE or PCTFE seals for set pressures above 50 PSIG (3.5 BAR).

  • Rugged materials of construction provide long service life
  • Self-aligning seat and poppet design offers bubble-tight cutoff for zero leakage to 95% of nominal set pressure
  • Unique "dirt guard" poppet protects against contamination ensuring optimum reliability
  • Stainless steel gooseneck adapter enables safe discharge to atmosphere or to downstream connection
  • Body: Brass
  • Poppet: Brass
  • Spring: 302 Stainless steel
  • Adapter: Stainless steel
  • Nominal set pressure range: 50 – 750 PSIG (3.5 – 52 BAR)
  • Crack pressure tolerance: ± 3% of set pressure
  • Relief flow: Full rated flow @ 110% of nominal set pressure, unaffected by up to 10% back pressure
  • Max operating pressure: 1000 PSIG (70 BAR)
  • Conformances: Cleanliness meets or exceeds CGA G-4.1; PED Cat IV
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Part Number Gas Service Seal Connections Temperature Range
5802039 Oxygen PTFE 1/4 in MNPT x CGA 440 (5/8 in female flare) -60°F to 375°F (-51°C to 190°C )
5802040 Inert (liquid nitrogen/air) PCTFE 1/4 in MNPT x CGA 295 (1/2 in female flare) -320°F to 165°F (-196°C to 74°C )
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ID Number
Cryogenic Relief Valves Catalog Page

WARNING: This product can expose you to chemicals including Lead, Chromium, Nickel, and 1-3 Butadiene, which are known to the state of California to cause cancer, birth defects, or other reproductive harm. And, this product can expose you to chemicals including Bisphenol A (BPA) which is known to the State of California to cause female reproductive harm. For more information go to www.