CSA 12.56:M99 (R2018)/ANSI/IAS NGV 4.6:99 (R2019)

1.1.1 These requirements apply to manually operated valves for high pressure natural gas.

1.1.2 These requirements do not apply to cylinder shut-off valves.

1.1.3 A valve that complies with the requirements for a Class A valve may be used for a Class B valve application, however, a Class B valve may not be substituted for a Class A valve.