DIN EN ISO 21922/A1 E:2023 制冷系统和热泵 阀门 要求、测试和标记 修订 1 (ISO 21922:2021/DAM 1:2023) 草案
Draft Document - Refrigerating systems and heat pumps - Valves - Requirements, testing and marking - Amendment 1 (ISO 21922:2021/DAM 1:2023); German and English version EN ISO 21922:2021/prA1:2023