CGA V-9

This standard covers general cylinder valve design, design qualification, required markings, and performance requirements such as operating temperature limits, pressure ranges, operating torque limits, and flow capabilities. Also provided are testing and maintenance requirements. Appendices include instructions for providing data to determine valve selection, information on using valves correctly, and a performance standard for valve protection.

This standard does not apply to cylinder valves used with nonrefillable cylinders (such as DOT-39, TC-39M, and nonrefillable cylinders manufactured under special permits or permits of equivalent level of safety); cylinder valves used in DOT-2P and DOT-2Q (TC-2P and TC-2Q) cylinders; cylinder valves with an integrated pressure regulator (VIPR); cylinder valves on DOT-4L (TC-4LM) cylinders; cylinder valves in refrigerated liquid service; or cylinder valves on DOT/TC cylinders (tubes) that are horizontally mounted to a chassis or framework for road transportation.