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Department: InstrumentationX
Product Type: ValvesX
Product Sub-Type: Check ValvesX
Product: Check Valve - Inline - COX
Trade Name: A-LOK®X

Series

CO4 (80) CO6 (30) CO8 (39)

Inch/Metric

Inch (126) Metric (23)

Connection Type

Double ferrule compression (134) Male NPT / Double ferrule compression (15)

Inlet port 1

1/4" A-LOK compression (42) 1/4" male NPT (15) 3/8" A-LOK compression (30) 1/2" A-LOK compression (39) 6mm A-LOK compression (23)

Outlet port 2

1/4" A-LOK compression (57) 3/8" A-LOK compression (30) 1/2" A-LOK compression (39) 6mm A-LOK compression (23)

CV Factor

0.62 (80) 1.7 (30) 2.65 (39)

Material - Seats

Ethylene propylene rubber (34) Fluorocarbon rubber (51) Highly fluorinated fluorocarbon rubber (30) Nitrile rubber (34)

Coded label color

Black (34) Brown (51) Green (30) Purple (34)

Cracking Pressure

1/3 psi (0.02 bar) (25) 1 psi (0.07 bar) (25) 5 psi (0.4 bar) (20) 10 psi (0.7 bar) (22) 25 psi (1.7 bar) (16) 50 psi (3.5 bar) (14) 75 psi (5.2 bar) (13) 100 psi (6.9 bar) (14)

Material - Seals

Ethylene propylene rubber (34) Fluorocarbon rubber (51) Highly fluorinated fluorocarbon rubber (30) Nitrile rubber (34)

Operating Temperature

-15 F to 200 F (-26 C to 93 C) (30) -15 F to 400 F (-26 C to 204 C) (51) -30 F to 250 F (-34 C to 121 C) (34) -70 F to 275 F (-57 C to 135 C) (34)

Orifice size

0.187 Inch (4.7mm) (80) 0.281 Inch (7.1mm) (30) 0.406 Inch (10.3mm) (39)

Special Cleaning

Cleaning for oxygen service (27)
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Check Valve - Inline - COCheck Valve - Inline - CO

Check Valve - Inline - CO

Parker Inline Check Valve - CO Series

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Showing 1 - 20 of 149
Part # Availability Price/UOM
++ 4A-CO4L-1/3-BN-SS Lead Time Required $118.15
4A-CO4L-1/3-BN-SS-C3 N/A Call to Order
++ 4A-CO4L-1/3-EPR-SS Lead Time Required $138.80
++ 4A-CO4L-1/3-KZ-SS Lead Time Required $224.50
++ 4A-CO4L-1/3-KZ-SS-C3 Lead Time Required $254.83
++ 4A-CO4L-1/3-V-SS Lead Time Required $129.90
++ 4A-CO4L-1/3-V-SS-C3 Lead Time Required $160.23
++ 4A-CO4L-1-BN-SS Lead Time Required $104.43
++ 4A-CO4L-1-EPR-SS Lead Time Required $138.80
++ 4A-CO4L-1-EPR-SS-C3 Lead Time Required $169.17
++ 4A-CO4L-1-KZ-SS Lead Time Required $224.50
++ 4A-CO4L-1-V-SS In Stock $129.90
++ 4A-CO4L-1-V-SS-C3 Lead Time Required $160.23
++ 4A-CO4L-5-BN-SS Lead Time Required $138.32
++ 4A-CO4L-5-BN-SS-C3 Lead Time Required $160.63
++ 4A-CO4L-5-EPR-SS Lead Time Required $145.56
++ 4A-CO4L-5-KZ-SS Lead Time Required $235.91
++ 4A-CO4L-5-V-SS Lead Time Required $129.90
++ 4A-CO4L-5-V-SS-C3 Lead Time Required $116.99
++ 4A-CO4L-10-BN-SS Lead Time Required $104.43
UOM Inlet port 1 Outlet port 2 Material - Seats Material - Seals Cracking pressure Material
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber Nitrile rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber Nitrile rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Ethylene propylene rubber Ethylene propylene rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber Fluorocarbon rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber Fluorocarbon rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber Nitrile rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Ethylene propylene rubber Ethylene propylene rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Ethylene propylene rubber Ethylene propylene rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber Fluorocarbon rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber Fluorocarbon rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber Nitrile rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber Nitrile rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Ethylene propylene rubber Ethylene propylene rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber Fluorocarbon rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Fluorocarbon rubber Fluorocarbon rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Nitrile rubber Nitrile rubber 10 psi (0.7 bar) 316 Stainless steel
4A-CO4L-1/3-BN-SS
Lead Time Required
$118.15
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

Nitrile rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1/3-BN-SS-C3
N/A
Call to Order
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

Nitrile rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1/3-EPR-SS
Lead Time Required
$138.80
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Ethylene propylene rubber

Ethylene propylene rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1/3-KZ-SS
Lead Time Required
$224.50
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1/3-KZ-SS-C3
Lead Time Required
$254.83
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1/3-V-SS
Lead Time Required
$129.90
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

Fluorocarbon rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1/3-V-SS-C3
Lead Time Required
$160.23
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

Fluorocarbon rubber

1/3 psi (0.02 bar)

316 Stainless steel
4A-CO4L-1-BN-SS
Lead Time Required
$104.43
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

Nitrile rubber

1 psi (0.07 bar)

316 Stainless steel
4A-CO4L-1-EPR-SS
Lead Time Required
$138.80
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Ethylene propylene rubber

Ethylene propylene rubber

1 psi (0.07 bar)

316 Stainless steel
4A-CO4L-1-EPR-SS-C3
Lead Time Required
$169.17
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Ethylene propylene rubber

Ethylene propylene rubber

1 psi (0.07 bar)

316 Stainless steel
4A-CO4L-1-KZ-SS
Lead Time Required
$224.50
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1 psi (0.07 bar)

316 Stainless steel
4A-CO4L-1-V-SS
In Stock
$129.90
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

Fluorocarbon rubber

1 psi (0.07 bar)

316 Stainless steel
4A-CO4L-1-V-SS-C3
Lead Time Required
$160.23
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

Fluorocarbon rubber

1 psi (0.07 bar)

316 Stainless steel
4A-CO4L-5-BN-SS
Lead Time Required
$138.32
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

Nitrile rubber

5 psi (0.4 bar)

316 Stainless steel
4A-CO4L-5-BN-SS-C3
Lead Time Required
$160.63
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

Nitrile rubber

5 psi (0.4 bar)

316 Stainless steel
4A-CO4L-5-EPR-SS
Lead Time Required
$145.56
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Ethylene propylene rubber

Ethylene propylene rubber

5 psi (0.4 bar)

316 Stainless steel
4A-CO4L-5-KZ-SS
Lead Time Required
$235.91
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

5 psi (0.4 bar)

316 Stainless steel
4A-CO4L-5-V-SS
Lead Time Required
$129.90
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

Fluorocarbon rubber

5 psi (0.4 bar)

316 Stainless steel
4A-CO4L-5-V-SS-C3
Lead Time Required
$116.99
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Fluorocarbon rubber

Fluorocarbon rubber

5 psi (0.4 bar)

316 Stainless steel
4A-CO4L-10-BN-SS
Lead Time Required
$104.43
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" A-LOK compression

1/4" A-LOK compression

Nitrile rubber

Nitrile rubber

10 psi (0.7 bar)

316 Stainless steel
Showing 1 - 20 of 149
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 is particularly suitable for applications requiring high integrity leak rates and re-sealing capabilities.

Application: In the key markets of chemical & refining, food, beverage & dairy, medical & dental, microelectronics, oil & gas, and power generation.
Parker Instrumentation Check Valves
Parker Instrumentation Check Valves

Customer Service 1.800.340.0854

650 North State Street
York, PA 17403 United States

[email protected]
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