DIN EN ISO 21922/A1:2023-10
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 / Note: Date of issue 2023-08-25*Intended as an amendment to DIN EN ISO ...