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Parker Check Valves

Check Valve

Parker CO Series Check Valves are designed for uni-directional flow control of fluids and gases in industries such as chemical processing, oil and gas production and transmission, pharmaceutical, pulp and paper, power and utilities.

The CO Series Check Valve is particularly suitable for applications requiring high integrity leak rates and re-sealing capabilities.

  • Seal integrity across the seat and to atmosphere is tested to 4 x 10 -9 std atm-cc/sec (4 x 10 -10 kPa - L/sec) for the CO4L with fluorocarbon rubber seals. All other sizes and seal materials are tested to 1 x 10 -5 std atm-cc/sec (1 x 10 -6 kPa - L/sec).
  • Special seat seal design provides a repeatable high integrity seal and accurate cracking pressures 100% factory tested. Cracking pressures include: 1/3, 1, 5, 10, 25, 50, 75, and 100 psi.
  • Valves are available with Male and Female NPT, CPITM, A-LOK®, UltraSeal, Male and Female VacuSeal, and Tube Adapter
  • Heat code traceability
  • Color coded identification labels indicate seal material


Pressure Rating: 6000 psig (414  bar) CWPTemperature Rating:

Fluorocarbon Rubber
-15 °F to 400 °F (-26 °C to 204 °C)

Buna-N Rubber-30 °F to 250 °F (-34 °C to 121 °C)

Ethylene Propylene Rubber
-70 °F to 275 °F (-57 °C to 135 °C)

Highly Fluorinated Fluorocarbon Rubber
-15 °F to 200 °F (-26 °C to 93 °C)

Orifice: .156" to .406" (4.0mm to 10.3mm)C v : .43 to 2.65


Check / Filter (CF Series)
Check Valves (C Series) 4130-C
Check Valves (CB Series) 4130-CB
Check Valves (CO Series) 4130-CO
Check Valves (LC Series) 4130-LC
KC Controls B series Ball Valves  C Series Check Valves
KC Controls B series Ball Valves  CO Series Check Valves

For more information click on the pdf image above for full specifications, call KC Controls on 01293 538940 or send us an e-mail to