ASME B16.44 pdf download Manually Operated Metallic Gas Valves for Use in 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...