CSA ANSI Z21.21a-2010/CSA 6.5a-2010

Details test and examination criteria for automatic valves, which may be individual automatic vales or valves, utilized as pars of automatic gas ignition systems. This standard also applies to commercial/industrial safety shutoff valves. This standard applies to automatic valves having maximum operating gas pressure ratings of 1/2, 2, and 5 psi (3.5, 13.8, and 34.5 kPa) or higher than 5 psi (34.5 kPa) in 5 psi (34.5 kPa) increments up to an including a maximum operating pressure of 60 psi (413.7 kPa)