Precision Cryogenic Relief Valve 10-750 psi

Key Features

Reseat

90% of cracking pressure (or as low as 85% for PTFE/PCTFE seals)

Cracking pressure range

10–750 psi (0.7–51.7 bar)

• Direct-acting precision design
• Factory preset – tamper-proof, non-adjustable in the field
• Cleaned and packaged for oxygen service
• Bubble-tight seal up to 95% of cracking pressure
• Cracks open at pre-set pressure (ordered by customer)
• Full opening at 110% of cracking pressure

Accuracy

Temperature range

−254°C to +200°C (−425°F to +392°F)

Burst pressure

>5000 psi

• ±5% (≤28.9 psi)
• ±1.45 psi (29–48.3 psi)
• ±3% (≥48.4 psi)
• PED-compliant – CE marking available

Models

• CRV – Vent to Atmosphere
• CRVD – With Deflector Cap
• CRVI – Inline Piped Exhaust

Connection Options

Inlet

1/4", 3/8", 1/2" NPT / Face Seal / SAE / Bi-Lok

Outlet

Vent / Pipe-A-Way / Deflector Cap

• Metric or imperial threads available upon request

Available Materials

Body

316 Stainless Steel (ASTM A479)

Spring

302 Stainless or 17-7 PH

Seals

PTFE / PCTFE / Viton® / Kalrez® / Fluorosilicone

Lubricant

Krytox®

Flow Capacity

• Orifice sizes from 4.9 mm to 10.2 mm
• Flow coefficients (Kdr) per ISO 4126-1 – available from manufacturer

Applications

• Cryogenic gas systems (LN₂, LOX, LAr)
• Medical and industrial oxygen systems
• Hydrogen and flammable gas service
• Vacuum lines and storage tanks