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Department: InstrumentationX
Product Type: ValvesX
Product Sub-Type: Check ValvesX
Product: Check Valve - Inline - COX
Coded label color: GreenX

Trade Name

A-LOK® (30) CPI™ (19)

Series

CO4 (42) CO6 (18) CO8 (28)

Inch/Metric

Inch (83) Metric (5)

Connection Type

Double ferrule compression (28) Female NPT (15) Male NPT (15) Male NPT / Double ferrule compression (2) Male NPT / Female NPT (3) Single ferrule compression (19) VacuSeal face seal (6)

Inlet port 1

1/4" A-LOK compression (9) 1/4" CPI compression (5) 1/4" female NPT (5) 1/4" male NPT (12) 1/4" VacuSeal face seal (6) 3/8" A-LOK compression (6) 3/8" CPI compression (6) 3/8" female NPT (2) 3/8" male NPT (4) 1/2" A-LOK compression (8) 1/2" CPI compression (8) 1/2" female NPT (8) 1/2" male NPT (4) 6mm A-LOK compression (5)

Outlet port 2

1/4" A-LOK compression (11) 1/4" CPI compression (5) 1/4" female NPT (8) 1/4" male NPT (7) 1/4" VacuSeal face seal (6) 3/8" A-LOK compression (6) 3/8" CPI compression (6) 3/8" female NPT (2) 3/8" male NPT (4) 1/2" A-LOK compression (8) 1/2" CPI compression (8) 1/2" female NPT (8) 1/2" male NPT (4) 6mm A-LOK compression (5)

CV Factor

0.62 (42) 1.7 (12) 1.85 (6) 2.65 (28)

Cracking Pressure

1/3 psi (0.02 bar) (13) 1 psi (0.07 bar) (16) 5 psi (0.4 bar) (14) 10 psi (0.7 bar) (14) 25 psi (1.7 bar) (11) 50 psi (3.5 bar) (8) 75 psi (5.2 bar) (4) 100 psi (6.9 bar) (8)

Orifice size

0.187 Inch (4.7mm) (42) 0.281 Inch (7.1mm) (12) 0.328 Inch (8.3mm) (6) 0.406 Inch (10.3mm) (28)

Special Cleaning

Cleaning for oxygen service (4)
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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 88
Part # Availability Price/UOM
++ 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-KZ-SS Lead Time Required $224.50
++ 4A-CO4L-5-KZ-SS Lead Time Required $235.91
++ 4A-CO4L-10-KZ-SS Lead Time Required $244.15
++ 4A-CO4L-10-KZ-SS-C3 Lead Time Required $266.97
++ 4A-CO4L-25-KZ-SS Lead Time Required $235.91
++ 4A-CO4L-50-KZ-SS Lead Time Required $235.91
++ 4A-CO4L-100-KZ-SS Lead Time Required $235.91
++ 4F-CO4L-1/3-KZ-SS Lead Time Required $213.81
++ 4F-CO4L-1-KZ-SS Lead Time Required $195.41
++ 4F-CO4L-5-KZ-SS Lead Time Required $219.15
++ 4F-CO4L-10-KZ-SS Lead Time Required $219.15
++ 4F-CO4L-25-KZ-SS Lead Time Required $219.15
++ 4M-CO4L-1/3-KZ-SS Lead Time Required $211.06
++ 4M-CO4L-1-KZ-SS Lead Time Required $191.84
++ 4M-CO4L-5-KZ-SS Lead Time Required $204.50
++ 4M-CO4L-10-KZ-SS Lead Time Required $191.84
++ 4M-CO4L-25-KZ-SS Lead Time Required $181.78
++ 4M-CO4L-50-KZ-SS Lead Time Required $178.42
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
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 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 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 10 psi (0.7 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 10 psi (0.7 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 25 psi (1.7 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 50 psi (3.5 bar) 316 Stainless steel
EA 1/4" A-LOK compression 1/4" A-LOK compression Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 100 psi (6.9 bar) 316 Stainless steel
EA 1/4" female NPT 1/4" female NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" female NPT 1/4" female NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" female NPT 1/4" female NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" female NPT 1/4" female NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 10 psi (0.7 bar) 316 Stainless steel
EA 1/4" female NPT 1/4" female NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 25 psi (1.7 bar) 316 Stainless steel
EA 1/4" male NPT 1/4" male NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1/3 psi (0.02 bar) 316 Stainless steel
EA 1/4" male NPT 1/4" male NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 1 psi (0.07 bar) 316 Stainless steel
EA 1/4" male NPT 1/4" male NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 5 psi (0.4 bar) 316 Stainless steel
EA 1/4" male NPT 1/4" male NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 10 psi (0.7 bar) 316 Stainless steel
EA 1/4" male NPT 1/4" male NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 25 psi (1.7 bar) 316 Stainless steel
EA 1/4" male NPT 1/4" male NPT Highly fluorinated fluorocarbon rubber Highly fluorinated fluorocarbon rubber 50 psi (3.5 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-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-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-10-KZ-SS
Lead Time Required
$244.15
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

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

10 psi (0.7 bar)

316 Stainless steel
4A-CO4L-10-KZ-SS-C3
Lead Time Required
$266.97
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

10 psi (0.7 bar)

316 Stainless steel
4A-CO4L-25-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

25 psi (1.7 bar)

316 Stainless steel
4A-CO4L-50-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

50 psi (3.5 bar)

316 Stainless steel
4A-CO4L-100-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

100 psi (6.9 bar)

316 Stainless steel
4F-CO4L-1/3-KZ-SS
Lead Time Required
$213.81
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" female NPT

1/4" female NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1/3 psi (0.02 bar)

316 Stainless steel
4F-CO4L-1-KZ-SS
Lead Time Required
$195.41
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" female NPT

1/4" female NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1 psi (0.07 bar)

316 Stainless steel
4F-CO4L-5-KZ-SS
Lead Time Required
$219.15
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" female NPT

1/4" female NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

5 psi (0.4 bar)

316 Stainless steel
4F-CO4L-10-KZ-SS
Lead Time Required
$219.15
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" female NPT

1/4" female NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

10 psi (0.7 bar)

316 Stainless steel
4F-CO4L-25-KZ-SS
Lead Time Required
$219.15
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" female NPT

1/4" female NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

25 psi (1.7 bar)

316 Stainless steel
4M-CO4L-1/3-KZ-SS
Lead Time Required
$211.06
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" male NPT

1/4" male NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1/3 psi (0.02 bar)

316 Stainless steel
4M-CO4L-1-KZ-SS
Lead Time Required
$191.84
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" male NPT

1/4" male NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

1 psi (0.07 bar)

316 Stainless steel
4M-CO4L-5-KZ-SS
Lead Time Required
$204.50
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" male NPT

1/4" male NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

5 psi (0.4 bar)

316 Stainless steel
4M-CO4L-10-KZ-SS
Lead Time Required
$191.84
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" male NPT

1/4" male NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

10 psi (0.7 bar)

316 Stainless steel
4M-CO4L-25-KZ-SS
Lead Time Required
$181.78
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" male NPT

1/4" male NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

25 psi (1.7 bar)

316 Stainless steel
4M-CO4L-50-KZ-SS
Lead Time Required
$178.42
View

UOM:

Inlet port 1:

Outlet port 2:

Material - Seats:

Material - Seals:

Cracking pressure:

Material:

EA

1/4" male NPT

1/4" male NPT

Highly fluorinated fluorocarbon rubber

Highly fluorinated fluorocarbon rubber

50 psi (3.5 bar)

316 Stainless steel
Showing 1 - 20 of 88
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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