ISO INTERNATIONAL STANDARD 9644 Third edition 2018-08 Agricultural irrigation equipment - Pressure losses in irrigation valves Test method Materiel agricoled'irrigation-Pertes depression dans les vannes d'irrigation-Méthoded'essai Referencenumber IS0 9644:2018(E) ISO @IS0 2018 Copyright Intemational Organization for Standardization IS09644:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland Cepyightlhimafinal oganiaton te Sandardzatine IS0 2018 -All rights reserved IS0 9644:2018(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normative references 3 Terms and definitions 4 Test installation. .2 4.1 Permissibledeviationofmeasuringdevices .2 .3 4.2 Test equipment. 4.2.1 Piping. 3 Throttling valve .3 4.2.2 4.2.3 Flowmeasuringdevice. 3 4.2.4 Pressuredifferentialmeasuringdevice 3 4.2.5 3 Pressuretaps 4.2.6 Temperature sensors. 5 4.2.7 Filtration. 5 Test procedure 5 5 5.1 Test installation 5 5.2 Test conditions. .5 5.2.1 Permissiblefluctuationsinmeasurements .5 5.2.2 Steady conditions .6 5.2.3 Unsteadyconditions 6 5.3 Test bench pressure loss. ..6 5.4 Test of valve .7 .7 6 Test results. 6.1 Presentation oftestresults 6.2 Calculatedvalvecoefficients .8 6.2.1 General. .8 6.2.2 Flowresistancecoefficient, .8 6.2.3 Valveflow coefficient,Ky .8 6.3 Test report. .9 AnnexA(informative)Measurementuncertainty .10 AnnexB (informative)Evaluation ofuncertainty offlow rate coefficient,Ky,and pressure lossescoefficient, ..14 Bibliography. .19 ili Copyrgh Intematianal ogS2&Arights reserved