ANSI Z21.21-2000/CSA 6.5-2000

Scope

standard applies to automatic valves which may be individual automatic valves or valves utilized as part of an automatic gas ignition system. This standard also applies to commercial/industrial safety shutoff valves. This standard does not apply to self-contained water heater, cooking appliance or room heater thermostats or self-contained automatic gas shutoff valves for hot water supply systems. This standard applies to automatic valves having maximum operating gas pressure ratings of ½, 2, 5 psi (3.5, 13.8, 34.5 kPa), or higher than 5 psi (34.5 kPa) in 5 psi (34.5 kPa) increments up to and including a maximum operating pressure of 60 psi (413 kPa).