IEC 60534-4:1982/AMD1:1986 ed1.0

Заменен

Amendment 1 - Industrial-process control valves. Part 4: Inspection and routine testing — 9 стр.

Establishes a series of seat leakage classes for application to specific designs of control valves and defines the test procedures.

Заменен на

IEC 60534-4:1999 ed2.0

ICS

23.060.40 Pressure. Including pressure-reducers / Регуляторы давления. Включая редукторы

25.040.40 Industrial process measurement and control / Измерение и контроль производственного процесса