ASME B16.38 pdf download Large Metallic Valves for Gas Distribution Manually Operated, NPS 2 1 / 2 (DN 65) to NPS 12 (DN 300), 125 psig (8.6 bar) Maximum 2.3 Configuration 2.3.1 Closure Indication 2.3.1.1 Valves designed for one-quarter turn operation shall be designed to visually show the open and closed position of the valve. A rectangular stem head or...