CSA/ANSI HGV 4.4:21

1 Scope This document provides the requirements and test methods for the safety performance of high pressure gas valves that are used in gaseous hydrogen stations of up to the H70 designation. This document covers the following gas valves: — check valve; — excess flow valve; — flow control valve; — hose breakaway device; — manual valve; — pressure safety valve; — shut-off valve. NOTE 1A For North American application, all references to rated pressure are considered to be equivalent to maximum allowable working pressure (MAWP).