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Check Valve



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Cryogenic Liquid Service

1/8” - 2” NPT
0 - 4500 Psig

Description

High flow, zero leak, low pressure drop check valve suitable for most fluid and gas applications. Fully guided poppet with free floating O’ring design is extremely tolerant of particulate contamination. A metal to metal positive stop in both the open and checked position protects O’ring and spring from over-stress fatigue. Zero external leakage is achieved by the utilization of a static O’ring seal with TFE backup ring. When specified with the proper seal material, these valves are ideally suited to cryogenic system applications.

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Technical Data

  • Nominal Crack Pressures: .15, 1, 3 & 8 Psig (0.01, 0.07, 0.21 & 0.55 bar)
  • Leakage: Zero to maximum operating pressure.
    • TFE seals may require back pressure to seal leak-tite.
  • Temperature Rating:
    • -320°F to 450°F (-195°C to 232°C)
       based on seal material
  • Maximum Operating Pressures to 300°F (149°C)

Pipe Size Brass Psig (bar) Carbon Steel Psig (bar) 303 Stainless Steel Psig (bar) 316 Stainless Steel Psig (bar)
1/8" - 1" 3000(206) 3000(206) 4500(310)
1-1/4" & 1-1/2" Non standard, consult factory
2" 1500(103)

Materials of Constructions

Component Valve Body Material
Brass Carbon 303 SS 316 SS
Inlet Cap, Outlet  Body, Poppet, Spring Retainer Brass ASTM B16 Carbon Steel, ASTM A108, Zinc & Black Plated per ASTM B633 303 SS, ASTM A5822 316 SS, ASTM A4792
Dynamic O'Ring1 Buna-N VitonTM
Static O'Ring1
Backup Ring Virgin TFE
Spring 302 SS, ASTM A313
1 Lubricated with Krytox™ GPL-202
2 PTFE Dry lubricant applied to threads

Dimensionsional/Flow Data


Pipe Size (NPT) A (inches) Hex Cv Flow at 5.0 Psid (SCFM)
1/8" 1.7 13/16" 1.7 35
1/4" 2.25 1" 3 60
3/8" 2.43 1-1/8" 3.9 80
1/2" 2.93 1-1/2" 7.4 150
3/4" 3.37 1-3/4" 11.4 280
1" 3.99 2" 14.2 380
1-1/4" 4.5 2-3/4" 26.8 700
1-1/2" 5.35
2" 6.1 3-1/2" Round1 51 1200
1 Machined from 3-1/2” round stock with 2-3/4” wrench flats.
Flow Tested in accordance with ISA S75.02 with air. Restrictions in the inlet or outlet piping may reduce flow

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.