CAD/BIM CATALOG

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Features:

Continuous operating temperature (COT): -40°F/300°F, -40°C/149°C

Contact factory or visit website for compatibility with CFC, HCFC, HFC and HFO refrigerants and oils

UL/cUL Recognized, Conforms to Pressure Equipment Directive 2014/68/EU

Enhanced internal design for maximum flow and minimum pressure drop

Design Pressure (DP) / Maximum abnormal pressure (MAP): Charted below

1/4" - 1/2" sized valves are designed for use with R744 (CO2)

5/8" - 7/8" sized valves are designed for use with R744 in cascading systems or secondary loops where design pressures are below the R744 critical pressure of 1058 psi

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Unit of Measure

Items	A 18720 CHECKMASTER® Check Valves - Piston	A 18721 CHECKMASTER® Check Valves - Piston	A 18722 CHECKMASTER® Check Valves - Piston	A 18723 CHECKMASTER® Check Valves - Piston	A 18838 CHECKMASTER® Check Valves - Piston
Connection Size	N/A 1/4 in	N/A 3/8 in	N/A 1/2 in	N/A 5/8 in	N/A 3/4 in
End Type	N/A ODS
Cv	N/A 0.70	N/A 1.40	N/A 2.71	N/A 4.10	N/A 8.76
Kv	N/A 0.61	N/A 1.21	N/A 2.34	N/A 3.55	N/A 7.58
ΔP	N/A 1 psi	N/A 1 psi	N/A 0.75 psi	N/A 0.75 psi	N/A 0.75 psi
MAP	N/A 1305 psi	N/A 1305 psi	N/A 1305 psi	N/A 1000 psi	N/A 1000 psi
Weight	N/A 0.05 kg0.11 lb	N/A 0.05 kg0.12 lb	N/A 0.07 kg0.16 lb	N/A 0.10 kg0.22 lb	N/A 0.19 kg0.43 lb
Operating Temperature [Min]	N/A -40 ºC-40 ºF
Operating Temperature [Max]	N/A 149 ºC300 ºF
A	N/A 3.62 in92 mm	N/A 4.29 in109 mm	N/A 5.15 in131 mm	N/A 5.43 in138 mm	N/A 7.01 in178 mm
B	N/A 3 in76 mm	N/A 3.6 in91 mm	N/A 4.28 in109 mm	N/A 4.43 in113 mm	N/A 5.86 in149 mm
C	N/A 0.71 in18 mm	N/A 0.71 in18 mm	N/A 0.85 in22 mm	N/A 1 in25 mm	N/A 1.34 in34 mm

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