IEC_60534-2_4_Industrial_Process_Control_Valves_-_Flow_capacity_Equations_1.pdf

NORME CE1 IEC INTERNATIONALE I NTE R NAT I O NA L 534-2-4 STAN DARD Premire dition First edition 1989-1 O Vannes de rgulation des processus industriels DeuxSrne partie:Capacit dco u I ement Section quatre-Caractristiques intrinsques de dbit et coefficient intrinsque de rglage Industrial-process control valves Part 2:Flow capacity Section Four-Inherent flow characteristics and rangeability.-.Numro de rfrence Reference number CEI/IEC 534-2-4:1989 COPYRIGHT International Electrotechnical CommissionLicensed by Information Handling ServicesCOPYRIGHT International Electrotechnical CommissionLicensed by Information Handling ServicesIEC 534 PT*Z-4 87 484489%0055L5L 4,Rvision de la prsente publication Le contenu technique des publications de la CE1 est constam-ment revu par la Commission afin dassurer quil reflte bien ltat actuel de la technique.Revision of this publication The technical content of I EC publications is kept under con-stant review by the I EC,thus ensuring that the content reflects current technology.Les renseignements relatifs ce travail de rvision,ltablis-sement des ditions rvises et aux mises jour peuvent tre obtenus auprs des Comits nationaux de la CE1 et en consultant les documents ci-dessous:Information on the work of revision,the issue of revised edi-tions and amendment sheets may be obtained from I EC National Committees and from the following I EC sources:Bulletin de ia CE I Annuaire de ia CE I Catalogue des publications de ia CE I Publi annuellement IEC Bulletin I EC Yearbook 0 Catalogue of I EC Publications Published yearly Terminologie En ce qui concerne la terminologie gnrale,le lecteur se repor-tera la Publication 50 de la CE I:Vocabulaire Electrotechnique International(VEI),qui ekt tablie sous forme de chapitres spars traitant chacun dun sujet dfini,lIndex gnral tant publi spa-rment.Des dtails complets sur le VE1 peuvent tre obtenus sur demande.Les termes et dfinitions figurant dans la prsente publication ont t soit repris du VEI,soit spcifiquement approuvs aux fins de cette publication.Terminology For general terminology,readers are referred to I EC Publi-cation 50:International Electrotechnical Vocabulary(IEV),which is issued in the form of separate chapters each dealing with a specific field,the General Index being published as a separate booklet.Full details of the IEV will be supplied on request.The terms and definitions contained in the present publication have either been taken from the IEV or have been specifically approved for fhe purpose of this publication.Symboles graphiques et littraux Graphical and letter syinbols Pour les symboles graphiques,symboles littraux et signes dusage gnral approuvs par la CEI,le lecteur consultera:-la Publication 27 de la CEI:Symboles littraux utiliser en-la Publication 617 de la CEI:Symboles graphiques pour lectrotechnique;schmas.Les symboles et signes contenus dans la prsente publication ont t soit repris des Publications 27 ou 617 de la CEI,soit spcifi-quement approuvs aux fins de cette publication.For graphical symbols,and letter symbols and signs approved by the I EC for general use,readers are referred to:-I EC Publication 27:Letter symbols to be used in electrical-IEC Publication 617:Graphical symbols for diagrams.technology;The symbols and signs contained in the present publication have either been taken from I EC Publications 27 or 617,or have been specifically approved for the purpose of this publication.Publications de la CE1 tablies par le mme Comit dEtudes I EC publications prepared by the same Technical Committee Lattention du lecteur est attire sur le deuxime feuillet de la couverture,qui numre les publications de la GE I prpares par le Comit dEtudes qui a tabli la prsente publication.The attention of readers is drawn to the back cover,which lists I EC publications issued by the Technical Committee which has prepared the present publication.,COPYRIGHT International Electrotechnical CommissionLicensed by Information Handling ServicesCOPYRIGHT International Electrotechnical CommissionLicensed by Information Handling ServicesIORME NTERNATIONA NT E R NAT I O N A E CE1 I EC 534-2-4 Premire dition First edition 1989-1 O Vannes de rgulation des processus industriels Deuxime partie:Capacit dcoulement Section quatre-Caractristiques intrinsques de dbit et coefficient intrinsque de rglage Industria I-process control valves Part 2:Flow capacity Section Four-Inherent flow characteristics and rangeability O CE1 1989 Droits de reproduction rservs-Copyright-all rights reserved Aucune.partie de cette publication ne peut tre reproduite ni No part of this publication may be reproduced or utilized in any utilise sous quelque forme que ce soit et par aucun procd.form or by any means,electronic or mechanical,including lectronique ou mcanique,y compris la photocopie et les photocopying and microfilm,without permission in writing from microfilms.sans laccord crit de tditeur.the publisher.Bureau Central de la Commission Electrotechnique Internationale 3,r