CSA 12.56:M99 (R2018)/ANSI/IAS NGV 4.6:99 (R2019)
Manually Operated Valves for Natural Gas Dispensing Systems
standard by CSA Group, 07/10/2000
Full Description
Scope 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.