ASME B16.40 pdf download MANUALLY OPERATED THERMOPLASTIC GAS SHUTOFFS AND VALVES IN GAS DISTRIBUTION SYSTEMS 1.2 Quality Systems Nonmandatory requirements relating to the productmanufacturer’s Quality System Program are describedin Appendix A. 2 cONSTRUCTION2.1 General (a) The workmanship employed in the manufactureand assembly of each valve shall provide gas tightness,safety and reliability of performance, and freedom frominjurious imperfections and defects. (b)...