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

Materials: 316 Stainless Steel: body, cover, poppet and cover gland. 300 Series Stainless Steel: spring 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.

Minimum operating temperature for standard o-ring check valves 0°F (17.8°C).
For low temperature option to -423°F (-252°C) add suffix LTTO (Low temperature spring & Teflon o-ring).

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.

Note: For optional material see Technical Information.

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.
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Item #

Fits Connection Type

Pressure Rating


Rated Cv

Add To Cart/Request Quote
CKO4400 N/A F250C N/A 60000 psi4136.79 bar N/A 0.094 in2.39 mm N/A 0.15 Request Quote
CKO6600 N/A F375C N/A 60000 psi4136.79 bar N/A 0.125 in3.18 mm N/A 0.28 Request Quote
CKO9900 N/A F562C N/A 60000 psi4136.79 bar N/A 0.187 in4.75 mm N/A 0.63 Request Quote
40CKO9900 N/A F562C40 N/A 40000 psi2757.85 bar N/A 0.250 in6.35 mm N/A 0.78 Request Quote
43CKO16 N/A F1000C43 N/A 43000 psi2964.70 bar N/A 0.438 in11.13 mm N/A 4.30 Request Quote
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