IEC 60534-2-4:1989 ed1.0

Заменен

Industrial-process control valves. Part 2: Flow capacity. Section Four: Inherent flow characteristics and rangeability — 15 стр.

Описание Изменения Ссылки Версии

Defines how to state typical control valve inherent flow characteristics and inherent rangeabilities. Also defines how to establish criteria for adherence to manufacturer's stated flow characteristics.

Заменен на

IEC 60534-2-4:2009 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