ANSI Z 21.93-2013

Details test and examination criteria for excess flow valves used after the service meter or second stage regulator not to exceed 2 inch (51mm) nominal pipe size. or use with natural, manufactured and mixed gases, liquefied petroleum (LP) gases, and LP gas-air mixtures at pressures not to exceed 5 psig, having a minimum operating pressure of no greater than 5 inches water column and capable of operation within an ambient temperature range of -20 F to 150 F (-29°C to +66°C ) Valves shall also be capable of operation at temperatures outside this specified range when so specified by the manufacturer.