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Provides unidirectional flow and tight shut-off for liquids and gas with high reliability. When differential drops below cracking pressure*, valve shuts off. (Not for use as relief valve.)

Materials: Body, cover, poppet: 316 Annealed Stainless Steel, Cover gland: Annealed Stainless Steel: High Nickel Alloy, Standard O-ring: Viton, for operation to 500° F (260°C). Buna-N or Teflon available for 250°F (121°C) or 400°F (204°C) respectively; specify when ordering.

*Cracking Pressure: 20 psi (1.38 bar) ±30%. Springs for higher cracking pressures (up to 100 psi (6.89bar)) available on special order for O-ring style check valves only.

Note: All sour oil and gas valves and fittings supplied without collars and glands unless otherwise specified.

Caution: While testing has shown O-Rings to provide satisfactory service life, both cyclic and shelf life may vary widely with differing service conditions, properties of reactants, pressure and temperature cycling and age of the O-ring. FREQUENT INSPECTIONS SHOULD BE MADE to detect any deterioration, and O-rings replaced as required.

All dimensions for reference only and subject to change.
For prompt service, Autoclave stocks select products. Consult your local representative.
All general terms and conditions of sale, including limitations of our liability, apply to all products and services sold.
Unit of Measure

Fits Connection Type

N/A F375C

Pressure Rating

N/A 30000 psi2068.39 bar


N/A 0.125 in3.18 mm

Rated Cv

N/A 0.28

A - Length

N/A 3.75 in95.25 mm

B - Length

N/A 2.62 in66.55 mm

C - Length

N/A 0.53 in13.46 mm

D - Typical Hex

N/A 0.75 in19.05 mm


N/A 1.18 in29.97 mm

Tubing Engagement Depth

N/A 0.69 in17.5 mm