On the basis of GB/T 7512-2017 and GB/T 35208-2017 (1) the model number, structural type and basic dimensions of the valve are revised; (2) the materials, processes, performance and inspection and test methods are revised Additions and supplements have been made; (3) Inspection rules and marking, packaging, storage and transportation, and usage requirements have been improved; (4) Normative appendices of pressure regulator inlet handwheel connection joints and self-closing straight valve interface types and connections have been added Dimensional requirements for interfaces, joints, and seals.