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How to Order - CH Series High Pressure Check Valves

Part Number Configuration

Basic Ordering Number
-
Cracking Pressure Designator
-
Material Designator

CH Series Check Valves

Connections Size Basic Part Number Valve Size A - in. (mm) H (Hex) - in. (mm)
Fractional Tube Fittings 1/8 CH4-D2 CH4 2.27 (57.7) 11/16
Fractional Tube Fittings 1/4 CH4-D4 CH4 2.44 (62.0) 11/16
Fractional Tube Fittings 3/8 CH8-D6 CH8 2.75 (69.9) 1
Fractional Tube Fittings 1/2 CH8-D8 CH8 2.96 (75.2) 1
Fractional Tube Fittings 3/4 CH16-D12 CH16 3.53 (89.7) 1 3/4
Fractional Tube Fittings 1 CH16-D16 CH16 3.88 (98.6) 1 3/4
Metric Tube Fittings 6 CH4-DM6 CH4 2.44 (62.0) 11/16
Metric Tube Fittings 8 CH8-DM8 CH8 2.70 (68.6) 1
Metric Tube Fittings  10   CH8-DM10 CH8  2.75 (69.9) 
Metric Tube Fittings  12   CH8-DM12 CH8  2.96 (75.2) 
Female NPT  1/4   CH4-4PF CH4  2.26 (57.4)  11/16 
 Female NPT  3/8   CH8-6PF CH8  2.55 (67.8) 
 Female NPT  1/2   CH8-8PF CH8  3.03 (77.0)  1 1/16 
 Female NPT  3/4   CH16-12PF CH16  3.23 (82.0)  1 3/4 
 Female NPT   CH16-12PM CH16  3.83 (97.3)  1 3/4 
 Female ISO Tapered 1/4   CH4-4FRT CH4  2.38 (60.5)  11/16 
 Female ISO Tapered 3/8   CH8-6FRT CH8  2.86 (72.6) 
  Female ISO Tapered 1/2   CH8-8FRT CH8  3.29 (83.6)  1 1/6 
 Male NPT 1/8   CH4-2PM CH4  1.9 (48.3)  11/16 
  Male NPT 1/4   CH4-4PM CH4  2.17 (55.1)  11/16 
  Male NPT 3/8   CH8-6PM CH8  2.36 (59.9) 
  Male NPT 1/2   CH8-8PM CH8  2.73 (69.3) 
 Male NPT 3/4 CH16-12PM CH16 3.23 (80.0) 1 3/4
 Male NPT  CH16-16PM CH16  3.67 (93.2)   1 3/4
Male ISO Tapered 1/4   CH4-4MRT  CH4 2.17 (55.1)  11/16 
Male ISO Tapered 1/2   CH8-8MRT CH8  2.73 (69.3) 
 Male/Female NPT 1/4   CH4-4PM4PF CH4  2.26 (57.4)  11/16 
Male/Female NPT  1/2   CH8-8PM8PF CH8  2.89 (73.4)  11/16 
Fractional Tube Fittings/Male NPT  3/8   CH8-D6PM6 CH8  2.56 (65.0) 
 Fractional Tube Fittings/Male NPT  1/2   CH8-D8PM8 CH8  2.74 (69.6) 

Material Designator:

Stainless Steel - 316 

Example: CH4-D4-1-316

CRACKING PRESSURE DESIGNATOR
Cracking Pressure psig Designator
1/3 1/3
1 1
5 5
10 10
25 25

O-Rings

FKM O-rings are the standard seal material on CH check valves. To order, nonstandard O-rings insert the designator from the table below into the valve part number. Example: CH4-D4-316-BU

MATERIAL DESIGNATOR TEMPERATURE RATING°F  (°C)
FKM Blank 0 to 400 (-17 to 204)
NITRILE -NBR -40 TO 250 (-40 TO 121)
LOW-TEMP NITRILE -NBR3 -65 TO 275 (-53 TO 135)
ETHYLENE PROPYLENE -EP -50 TO 300 (-45 TO 148)
KALREZ -KZ -10 TO 400 (-23 TO 204)

Safety Locks

Safety locks prevent accidental coupling and uncoupling. They can be used as part of a plant’s Lockout/Tagout program. Safety locks can be ordered for 1/4”, 3/8”, 1/2” and 3/4” bodies.