ISO INTERNATIONAL STANDARD 6953-3 First edition 2012-08-01 Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulators Transmissionspneumatiques-Regulateurs depression et filtre- regulateurspouraircomprime- Partie3:Methodesd'essaialternativespourmesurerles caracteristiques dedebit desregulateurs depression Reference number ISO 6953-3:2012(E) TSO @ISO 2012 ISO6953-3:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 4122749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ ISO 2012 -All rights reserved ISO6953-3:2012(E) Contents Page Foreword .iv Introduction 1 Scope 2 Normativereferences 3 Terms and definitions. 2 4 Symbols and units 5 Test installation.. 5.1 Test circuit. 5.2 General requirements.. 5.3 Isothermaltank (items4and5) 5.4 Special requirements. 6 Test procedures 6.1 Test conditions.. 6.2 Measuring procedures 6.3 Calculation of characteristics 7 Presentation oftest results 11 8 Identificationstatement. AnnexA(informative)Examplesoftestresults .12 AnnexB(informative)Variousdataprocessingmethods .28 AnnexC(informative)Visualizationofdataprocessingprocedures.. 37 AnnexD (informative) lllustrations of overshoot and undershoot on regulated pressure response and largevariations on inletpressure 40 Bibliography. 45 @ ISO 2012 -Allrights reserved ili ISO 6953-3:2012(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies established has the rightto be represented on that committee.International organizations,governmental and non-governmental, in liaison with isO, also take part in the work.isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO6953-3waspreparedbyTechnicalCommitteeISO/TC131,Fluidpowersystems,SubcommitteeSC5, Controlproducts andcomponents. Iso 6953 consists of the following parts, under the general title Pneumatic fluid power- Compressed air pressureregulatorsandfilter-regulators: 一 Part 2: Test methods to determine the main characteristics to be included in literature from supplier -Part3:A/ternativetestmethodsformeasuringtheflow-ratecharacteristics ofpressureregulators iv @ ISO 2012 -All rights reserved ISO 6953-3:2012(E) Introduction This part of Iso 6953 defines alternative test methods for flow-rate characteristics of pneumatic pressure These methods measure the forward flow-rate characteristics by passing compressed air from a charged passing compressed air from an isothermal tank, through the regulator under test, and out to the atmosphere. The test methods specified in this part of isO 6953 have the following advantages over test methods specified inISO6953-2 a) an airsource withalargeflow-rate capacity is not required; b) c) air consumption is minimized; and d) test time is shortened @ISO 2012-All rights reserved ISO 6953-3:2012(E) INTERNATIONALSTANDARD Pneumatic fluid power Compressed air pressure regulators and filte