International Standards and Conformity Assessment for all electrical, electronic and related technologies



Reference EN 60534-2-1:2011
Title Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
Project Number 22368
Abstract/Scope IEC 60534-2-1:2011 includes equations for predicting the flow of compressible and incompressible fluids through control valves. The equations for incompressible flow are based on standard hydrodynamic equations for Newtonian incompressible fluids. They are not intended for use when non-Newtonian fluids, fluid mixtures, slurries or liquid-solid conveyance systems are encountered. The equations for incompressible flow may be used with caution for non-vaporizing multi-component liquid mixtures. This second edition cancels and replaces the first edition published in 1998. This edition constitutes a technical revision. It includes the following significant technical changes with respect to the previous edition: - the same fundamental flow model, but changes the equation framework to simplify the use of the standard by introducing the notion of Δpsizing; - changes to the non-turbulent flow corrections and means of computing results; - multi-stage sizing as an Annex.


Current Stage code 6060
Current Stage code date 2011-05-20
Current Stage code deadline 2012-02-04
Deadline date for vote  


Order Voucher  


IEC Technical Body IEC/SC 65B
Reference Document IEC 60534-2-1:2011 (EQV)
ICS 23.060.40 - Pressure regulators
25.040.40 - Industrial process measurement and control
Keywords Industrial process; Valve; Flow capacity; Sizing; Fluid flow
Note Supersedes EN 60534-2-1:1998
Special National Condition(s)  


Categories - Aspects
Product Life Cycle


Deadline Date
6060 2011-05-20 2012-02-04 export to doc file  EN  FR  DE
5099 2011-05-04 2011-06-01  
5060 2011-01-24 2011-02-14 export to doc file  EN
5020 2010-11-19 2011-01-21  
3090 2010-04-16 2010-06-30  
5060 2009-09-07 2009-09-21 export to doc file  EN
5020 2009-04-03 2009-09-04  
1090 2009-03-31 2009-04-03  

Implementation Dates

date of Ratification (DOR) (1) 2011-05-04
date of Availability (DAV) (2) 2011-05-20
date of Announcement (DOA) (3) 2011-08-04
date of Publication (DOP) (4) 2012-02-04
date of Withdrawal (DOW) (5) 2014-05-04


Supersedes EN 60534-2-1:1998
Superseded by  
Normative reference (6) EN 60534-1:2005
EN 60534-2-3:1998

(1) Date of ratification (dor) date when the Technical Board notes the approval of an EN (and HD for CENELEC), from which time the standard may be said to be approved

(2) Date of availability (dav) date when the definitive text in the official language versions of an approved CEN/CENELEC publication is distributed by the Central Secretariat

(3) Date of announcement (doa) latest date by which the existence of an EN (and HD for CENELEC), a TS or a CWA has to be announced at national level

(4) Date of publication (dop) latest date by which an EN has to be implemented at national level by publication of an identical national standard or by endorsement

(5) Date of withdrawal (dow) latest date by which national standards conflicting with an EN (and HD for CENELEC) have to be withdrawn

(6) This list of normative references is purely indicative. The only official list of normative reference is the list of the published standard.