update:

better quality:

ISO 5209:1977 General purpose industrial valves -- Marking
ISO 6002:1992 Bolted bonnet steel gate valves
ISO 6552:1980 Automatic steam traps -- Definition of technical terms


added missing:

ISO 6553:2016 Automatic steam traps -- Marking


new missing list:

ISO 5210:2017 Industrial valves -- Multi-turn valve actuator attachments
ISO 5211:2017 Industrial valves -- Part-turn actuator attachments
ISO 15848-1:2015/AMD 1:2017 Industrial valves -- Measurement* test and qualification procedures for fugitive emissions -- Part 1: Classification system and qualification procedures for type testing of valves


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