DIN EN IEC 60534-4:2023-08 工业过程控制阀 - 第 4 部分:检查和例行测试 (IEC 60534-4:2021)
Industrial-process control valves - Part 4: Inspection and routine testing (IEC 60534-4:2021); German version EN IEC 60534-4:2022 / Note: DIN EN 60534-4 (2007-06) remains valid alongside this standard until 2025-01-20.