DIN EN ISO 28921-1:2017 Industrial valves - Isolating valves for low-temperature applications - Part 1: Design, manufacturing and production testing (ISO 28921-1:2013); German version EN ISO 28921-1:2017 has been changed from DIN EN 12567:2000 Industrial valves - Isolating valves for LNG - Specification for suitability and appropriate verification tests; German version EN 12567:2000.
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