Cryogenic Relief Valve Stainless (CRV)
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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) Description 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 Component Body, Poppet, Seat Screw, Spring Retainer, In-Line Adapter1, Nuts and Ferrules Spring Material 316 Stainless Steel (ASTM A479)2 302 or 17-7 PH Stainless Steel (ASTM A313) PCTFE (ASTM D1430), Viton® or Teflon® ® 1 Inline Adapters utilize Viton o-ring seals. Metal to Metal Face Seal Seals Inline Adapters are Electro Polished to 10 Ra Max. Valves supplied with Metal to Metal Face Seal connections have Electro Polished Inlet, Poppet and Seat Screw to 10 Ra Max.

CRYOGENIC RELIEF VALVE (STAINLESS) Configuration Shown CRV4T-4V Dimensional Data Inlet Size 1/4" NPT 1/2" NPT -4 Face Seal 1/4" Bi-Lok 1/2" Bi-Lok -8 Face Seal Outlet Vent to Atmosphere Deflector Cap 1/4" FNPT 3/8” FNPT 1/2" FNPT -4 Face Seal 1/4" Bi-Lok 1/2" Bi-Lok -8 Face Seal Note: Dimensions shown with Bi-Lok nuts finger-tight. Dimensions are in inches (millimeters), for reference only and subject to change. NPT Threads per ASME B1.20.1 Flow Data Set Pressure Range (Psig) From Viton® and Krytox® are registered trademarks of DuPont. CRV4 - 4 – K – 350 Configuration CRV Vent to Atmosphere...