GB/T 12220-1989

This standard specifies the mandatory marking requirements for general-purpose industrial valves, including information such as the manufacturer's name or trademark, nominal pressure, nominal diameter, and material designation. It is applied in the manufacturing, procurement, and quality inspection of valves used in fluid systems, such as water, oil, gas, and steam pipelines, to ensure traceability and correct installation. The standard is relevant for valve producers, engineering contractors, and end-users in industries like petrochemical, power generation, and municipal water supply.