ASME B16.44 pdf download MANUALLYOPERATED METALLIC GAS VALVES FOR USEIN ABOVEGROUND PIPING SYSTEMS UP TO 5 PSI 1 SCOPE 1.1 General This Standard applies to new valve construction and covers quarter turn manually operated metallic valves in sizes NPS 4 1 ⁄ 4 and tubing sizes 1 1 ⁄ 4 O.D. These valves are intended for indoor installation as gas...