IEC 60534-2-4-ed.2.0

Annotation of standard text IEC 60534-2-4-ed.2.0 :

IEC 60534-2-4:2009 applies to all types of industrial-process control valves. It defines how to state typical control valve inherent flow characteristics and inherent rangeabilities. It also defines how to establish criteria for adherence to manufacturer-stated flow characteristics. This edition constitutes a technical revision. The main changes with respect to the previous edition are: - update the normative references; - delete the terminology included in IEC 60534-1; - transform the previous Note 1 in Clause 6; - redraw the graphics; - delete the previous Figure 3. La CEI 60534-2-4:2009 sapplique a tous les types de vannes de regulation des processus industriels. Elle definit comment etablir les caracteristiques intrinseques de debit de reference et les coefficients intrinseques de reglage des vannes de regulation. Elle definit aussi comment etablir les criteres dacceptation des caracteristiques de debit annoncees par le constructeur. Cette edition constitue une revision technique. Les modifications techniques majeures par rapport a ledition precedente sont les suivantes: - mettre a jour les references normatives; - supprimer la terminologie incluse dans CEI 60534-1; - transformer la Note 1 precedente en Article 6; - redessiner des graphiques; - supprimer la precedente Figure 3.