This standard applies to check valves used in general industrial and medical compressed gas service designed
for service pressures up to 3000 psig (20 680 kPa) and used in conjunction with cylinder valve or manifold con-
nections specified by various standards of CGA.2 These connections may be incorporated as part of equipment
such as regulator inlet connections, manifold connections, or other high pressure hose line (pigtail) inlet and
outlet connections. See CGA E-3, Pipeline Regulator Inlet Connection Standards; CGA E-9, Standard for
Flexible PTFE-Lined Pigtails for Compressed Gas Service; CGA E-11, Standard for Stationary Compressed
Gas Cylinder Discharging Manifolds for Working Pressure up to 3000 psig; CGA V-l, Standard for Compressed
Gas Cylinder Outlet and Inlet Connections; and CGA V-10, High Pressure Gas Trailer Connections
[5, 6, 7, 8, 9].
This standard does not apply to check valves used as an integral part of a regulator, residual pressure cylinder
valve, gas pump, or otherwise internal component of other equipment. This standard does not apply to cryo-
genic or liquefied gas check valves.
Flammable, toxic, high purity, or specialty gas applications can require additional specialized design require-
ments.
CGA E-16-2008 Referenced Document
ASTM G63 Standard Guide for Evaluating Nonmetallic Materials for Oxygen Service
ASTM G94 Standard Guide for Evaluating Metals for Oxygen Service
CGA E-3 Standard for Low Pressure Pipeline Station Outlet/Regulator Inlet Connections*， 2024-04-19 Update
CGA E-9 Standard for Flexible Stainless Steel Braided Hoses Used in Compressed Gas Service*， 2024-04-19 Update
CGA G-4.1 CENTRIFUGAL COMPRESSORS FOR OXYGEN SERVICE
CGA V-1 STANDARD FOR COMPRESSED GAS CYLINDER VALVE OUTLET AND INLET CONNECTIONS
NFPA 51 Standard for the Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes