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How to Order - CP / CPA Medium Pressure Check Valves

Fixed Cracking Pressure, CP Series

End Connections Inlet/Outlet End Connections Size Basic Ordering Number Series Cv Dimensions A, in. (mm) Dimensions B, in. (mm)
Female NPT 1/4 in. 4CP4PF 4CP   2.41 (61.2) 3/4
Female NPT 1/2 in. 8CP8PF 8CP   3.71 (94.2) 1 1/16
Male NPT 1/4 in. 4CP4PM 4CP   1.62 (41.1) 9/16
Male NPT 1/2 in. 8CP8PM 8CP   2.28 (57.9) 7/8
Female/Male NPT 1/4 in. 4CP4PF4PM 4CP   2.29 (58.2) 3/4
Male/Female NPT 1/4 in. 4CP4PM4PF 4CP   1.75 (44.4) 3/4
Male/Female NPT 1/2 in. 8CP8PM8PF 8CP   2.83 (71.9) 1 1/16
Female ISO 1/4 in. 4CP4FRT 4CP   2.54 (64.5) 3/4
Male ISO 1/4 in 4CP4MRT 4CP   1.62 (41.1) 9/16

Adjustable Cracking Pressure, CPA Series

End Connections Inlet/Outlet End Connections Size  Basic Ordering Number  Series Cv Dimensions A, in. (mm) Dimensions B, in. (mm)
Female NPT 1/4 in. 4CPA4PF 4CPA   2.98 (75.7) 3/4
Male NPT 1/4 in. 4CPA4PM 4CPA   1.62 (41.1) 916
Male NPT 1/2 in. 8CPA8PM 8CPA   2.56 (65.0) 7/8
Male ISO 1/4 in. 4CPA4MRT 4CPA   1.62 (41.1) 9/16
Male ISO 1/2 in. 8CPA8MRT 8CPA   2.56 (65.0) 7/8

Part Number Configuration

Basic Ordering Number
-
Cracking Pressure Designator
-
Material Designator
-
O-Ring Designator

Example: 4CP4PF-316-KZ (fixed cracking pressure, CP Series)

Example: 4CPA4PF-5-316-KZ (adjustable cracking pressure, CPA Series)

Cracking Pressure psi Designator
1/3 1/3
1 1
5 5
10 10
15 15
20 20
25 25
30 30
35 35
40 40
45 45
50 50
55 55
60 60
70 70
75 75
80 80
85 85
90 90
100 100

 

Material Designator
Valve Body  
Stainless Steel 316
Brass B
O-Ring  
*Viton™ V
**Buna N BU
Ethylene Propylene EP
Kalrez™ KZ

*Viton™ O-ring comes standard on Stainless

**Buna N O-ring comes standard on Brass

(no need to add designator to part number)

Cracking Pressure PSIG Designator
3 to 50 3
50 to 150 50

CP / CPA Series Medium Pressure Check Valves Accessories

Deflector Caps

Deflector Caps are anodized aluminum machined caps which thread onto a ¼” or ½” male NPT check valve outlet. Defl ector caps are color-coded to Gas Association Standard EN 1089-3 which can be used to identify type of gas or hazard property, or the different colors can be used to identify system working pressure, valve cracking pressure, or other non-safety relief application. Deflector Caps are not to be used for code-rated relief applications.

Color Condition Order Code 1/4" Order Code 1/2"
Bright Green Inert 4CP-DC-GN 8CP-DC-GN
Red Flammable 4CP-DC-RD 8CP-DC-RD
Maroon Acetylene 4CP-DC-MR 8CP-DC-MR
Dark Green Argon 4CP-DC-DG 8CP-DC-DG
Black Nitrogen 4CP-DC-BK 8CP-DC-BK
Grey Carbon Dioxide 4CP-DC-GY 8CP-DC-GY
Brown Helium 4CP-DC-BN 8CP-DC-BN

Field Modification Kits

Field Modification Kits are available to rebuild or change the cracking pressure of an existing Medium Pressure Check Valve (CP/CPA series only). This work should be done by a qualifi ed valve repair or automation facility only. Field Modification Kits include work instructions for disassembly, replacing, and reassembly, and a replacement o-ring, spring, and label to apply over the factory-assigned part number indicating the new cracking pressure for the valve.

Configuration Part Number Description
4CP Non-Adjustable Spring Kits 4CPSK-1/3 Spring Kit 4CP 1/3#
 4CPSK-1  Spring Kit 4CP 1#
 4CPSK-5  Spring Kit 4CP 5#
   4CPSK-10  Spring Kit 4CP 10#
   4CPSK-20  Spring Kit 4CP 20#
   4CPSK-25  Spring Kit 4CP 25#
   4CPSK-30  Spring Kit 4CP 30#
  4CPSK-35 Spring Kit 4CP 35#
  4CPSK-40 Spring Kit 4CP 40#
  4CPSK-45 Spring Kit 4CP 45#
  4CPSK-50 Spring Kit 4CP 50#
   4CPSK-55  Spring Kit 4CP 55#
   4CPSK-60  Spring Kit 4CP 60#
  4CPSK-70 Spring Kit 4CP 70#
  4CPSK-75  Spring Kit 4CP 75#
   4CPSK-80  Spring Kit 4CP 80#
  4CPSK-85 Spring Kit 4CP 85#
  4CPSK-90 Spring Kit 4CP 90#
  4CPSK-100 Spring Kit 4CP 100#
 4CPA Adjustable Spring Kits 4CPASK-3-50  Spring Kit 4CPA 3-50#
 4CPASK-50-150  Spring Kit 4CPA 50-150#
 4CPASK-150-350  Spring Kit 4CPA 150-350#
   4CPASK-350-600  Spring Kit 4CPA 350-600#

 

Configuration Part Number Description
8CP Non-Adjustable Spring Kits 8CPSK-1/3 Spring Kit 8CP 1/3#
8CPSK-1 Spring Kit 8CP 1#
8CPSK-5 Spring Kit 8CP 5#
  8CPSK-10 Spring Kit 8CP 10#
  8CPSK-20 Spring Kit 8CP 20#
  8CPSK-25 Spring Kit 8CP 25#
  8CPSK-30 Spring Kit 8CP 30#
  8CPSK-35 Spring Kit 8CP 35#
  8CPSK-40 Spring Kit 8CP 40#
   8CPSK-45  Spring Kit 8CP 45#
   8CPSK-50  Spring Kit 8CP 50#
   8CPSK-55  Spring Kit 8CP 55#
   8CPSK-60  Spring Kit 8CP 60#
   8CPSK-70  Spring Kit 8CP 70#
   8CPSK-75  Spring Kit 8CP 75#
   8CPSK-80  Spring Kit 8CP 80#
  8CPSK-85  Spring Kit 8CP 85#
   8CPSK-90  Spring Kit 8CP 90#
   8CPSK-100  Spring Kit 8CP 100#
 8CPA Adjustable Spring Kits   8CPASK-3-50  Spring Kit 8CPA 3-50#
 8CPASK-50-150  Spring Kit 8CPA 50-150#
 8CPASK-150-350  Spring Kit 8CPA 150-350#
   8CPASK-350-600  Spring Kit 8CPA 350-600#