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Prevent reverse flow where leak-tight shut-off is not mandatory. When differential drops below cracking pressure, valve closes. With all-metal components, valve can be used up to 650°F (343°C). See Technical Information section for connection temperature limitations. (Not for use as a relief valve.)

Ball and poppet are an integral design to assure positive, in-line seating without “chatter”. Poppet is designed essentially for axial flow with minimum pressure drop.

Materials: 316 Stainless Steel: Body, cover, cover gland, ballpoppet. 300 Series Stainless Steel: Spring

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.

Caution: See Tubing section for proper selection of tubing.

Note: All check valves are furnished complete with connection components unless otherwise specified.

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
QSB4400 N/A QS250 N/A 15000 psi1034.20 bar N/A 0.188 in4.78 mm N/A 0.15 Request Quote
QSB6600 N/A QS375 N/A 15000 psi1034.20 bar N/A 0.250 in6.35 mm N/A 0.63 Request Quote
QSB9900 N/A QS562 N/A 15000 psi1034.20 bar N/A 0.359 in9.12 mm N/A 2.30 Request Quote
QSB12 N/A QS750 N/A 15000 psi1034.20 bar N/A 0.516 in13.11 mm N/A 4.70 Request Quote
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