This standard serves to inform cylinder valve users, buyers, sellers, manufacturers, and others in the safe and proper use of cylinder valves.

This standard covers cylinder valve design, manufacture, and use including performance requirements such as operating temperature limits, pressure range, and flow capabilities. It also includes requirements such as materials, inlet and outlet connections, cleaning, qualification and production testing, maintenance, and reconditioning. This standard also includes guidelines and requirements for the design, material selection, testing, and marking of cylinder valve protective caps. Except as noted in the last paragraph of this section, this standard is intended for valves for compressed gases packaged in U.S. Department of Transportation (DOT) and Transport Canada (TC) cylinders.

This standard provides information on valve selection, valve use guidelines, and valve protection caps (see Appendix A, Appendix B, and Section 10, respectively).

Standards incorporated by reference in this publication include the referenced document's procedures, criteria, and other requirements unless otherwise noted.

This standard does not prejudice the continued use of valves in service or in inventory at a manufacturer's or user's site that were manufactured before the effective date of this standard provided the valves are identifiable to the original valve manufacturer and traceable to a manufacturing period. The identifying marks shall be permanent and visible on an installed valve.

The effective date of this standard is three years from the date of the publication of this edition, which was May 4, 2012. Valves manufactured on and after the effective date of this standard shall be in compliance with this standard.

With the exception of post-type medical valves, this standard also does not prejudice the use of valves that are Listed® or in compliance with both ISO 10297, Transportable gas cylinders—Cylinder valves—Specification and type testing, and ISO 14246, Transportable gas cylinders—Gas cylinder valves—Manufacturing tests and inspections, excluding Section 4.4, "Revalidation tests", of ISO 14246-2001 [1, 2].¹

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.

¹ References are shown by bracketed numbers and are listed in order of appearance in the reference section.

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• CGA C-1 : METHODS FOR PRESSURE TESTING COMPRESSED GAS CYLINDERS-Tenth Edition
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