Check Valves with Fixed Cracking Pressures—C and CP Series 
Swagelok® check valves with fixed cracking pressures are available in 316 stainless steel and brass, with end connections from 1/8 to 1 in. and 6 to 12 mm in size.
More Information
Download the Check Valves—C, CA, CH, CP, and CPA series catalog.
Find poppet check valves in the product search.
Other Check Valves
Bonded-poppet check valves with fixed cracking pressure—CH series
Check valves with adjustable cracking pressures—CA and CPA series
C Series
The C series is a two-piece stainless steel or brass check valve with O-ring body seal.
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Specifications
Working Pressure
Temperature
Nominal Cracking Pressure
Flow Coefficient
Body Material
Seal Material
End Connections
• Type
• Size
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Up to 3000 psig (206 bar)
–50 to 375°F (–45 to 190°C)
1/3 to 25 psi (0.03 to 1.8 bar)
0.10 to 4.48
316 stainless steel, brass
Fluorocarbon FKM, Buna N
Swagelok tube fittings, NPT, male VCR® face seal fittings
1/8 to 1 in.; 6 to 12 mm
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Inlet Gaskets (2C, 4C, 6C, and 8C Series)
PTFE-coated 316 stainless steel inlet gaskets are available for 2C, 4C, 6C, and 8C series valves to reduce the possibility of dislodging the O-ring in systems where pressure surges, shock, or pulses occur. Gaskets are standard in 6C and 8C series valves with cracking pressures greater than 50 psi (3.5 bar) and in 12C and 16C series valves.
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CP Series
The CP series check valve has a compact, one-piece pipe-ended body in stainless steel or brass with a fully contained O-ring seal.
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Specifications
Working Pressure
Temperature
Nominal Cracking Pressure
Flow Coefficient
Body Material
Seal Material
End Connections
• Type
• Size
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Up to 3000 psig (206 bar)
–50 to 375°F (–45 to 190°C)
1/3 to 25 psi (0.03 to 1.8 bar)
0.35 and 1.20
316 stainless steel, brass
Fluorocarbon FKM, Buna N
NPT and ISO
1/4 and 1/2 in.
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Deflector Cap 
A polyethylene deflector cap is available for CP series valves with male NPT end connections. The deflector cap deflects flow from direct contact with personnel and prevents atmospheric contaminants from entering the valve.
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Testing
Every C and CP series check valve is factory tested for crack and reseal performance with a liquid leak detector. Valves are cycled six times prior to testing. Every valve is tested to ensure it seals within 5 s at the appropriate reseal pressure.
Cleaning and Packaging
Every C series check valve with VCR end connections is processed in accordance with Swagelok Special Cleaning and Packaging (SC-11) to ensure compliance with product cleanliness requirements as stated in ASTM G93 Level C.
All other C series check valves, as well as every CP series check valve, are cleaned in accordance with Swagelok Standard Cleaning and Packaging (SC-10).
Options
Seal Materials
Fluorocarbon FKM O-rings are standard in 316 stainless steel valves and optional in brass valves; Buna N O-rings are standard in brass valves and optional in 316 stainless steel valves. Ethylene propylene and neoprene O-rings are also available.
Special Alloys
Springs of alloy 400 or alloy C-276 are available in some sizes. Valve bodies of alloy 400, carbon steel, aluminum, or other alloys are available in some sizes.
PTFE-Coated Springs
Springs with PTFE coating are available in some sizes.
Special Cleaning
Special cleaning and packaging in accordance with Swagelok Special Cleaning and Packaging (SC-11) to ensure compliance with product cleanliness requirements as stated in ASTM G93 Level C is available as an option for valves with Swagelok tube fitting or NPT end connections.
Maintenance Kits
Seal kits, gasket kits, and spring kits are available.
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