This standard specifies the structural types and parameters, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of copper threaded gate valves, ball valves, globe valves and check valves (hereinafter referred to as valves). quality promise. This standard is applicable to gate valves, globe valves, check valves and ball valves with nominal dimensions DN≤100 mm, operating temperature -20 ℃ ≤ t ≤ 180 ℃, and nominal pressure PN ≤ 4.0 MPa. The working medium is water, non-corrosive liquid, Air, saturated steam.