CSA/ANSI Z23551-4:22 :
Safety and control devices for gas burners and gas- burning appliances — Particular requirements — Part 4: Valve-proving systems for automatic shut-off valves (Adopted ISO 23551-4:2018, (second edition, 2018-04, with North American deviations)
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Safety and control devices for gas burners and gas- burning appliances — Particular requirements — Part 4: Valve-proving systems for automatic shut-off valves (Adopted ISO 23551-4:2018, (second edition, 2018-04, with North American deviations)
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