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These requirements cover shut-off valves for use on cylinders that comply with the specifications and charging and maintenance regulations of the U.S. Departmen t of Transportation (DOT) or the corresponding specifications and regulations of the Canadian Transport Commission (CTC).

Valves covered by these requirements are for use on DOT or CTC cylinders used in applications such as, but not limited to, automo tive, medical, or industrial systems or facilities, and as covered in the following standards:

Storage and Handling of Liquefied Petroleum Gases, NFPA 58.

Oxygen-Fuel Gas Systems for Welding and Cutting, NFPA 51.

Safety Requirements for the Storage and Handling of Anhydrous Ammonia, ANSI K61.1.

Safety in Welding and Cutting, ANSI Z49.1.

Health Care Facilities, NFPA 99.