ISO INTERNATIONAL STANDARD 10770-2 Second edition 2012-12-01 Hydraulic fluid power Electrically modulated hydraulic control valves - Part 2: Test methods for three-port directional flow-control valves Transmissions hydrauliques Distributeurs hydrauliques a modulation électrique- -Partie 2:Méthodes d'essai pour distributeurs de commande de débit a trois voies Reference number ISO 10770-2:2012(E) LSO @ ISO 2012 IHS under itted without license from IHS Not for Resale ISO 10770-2:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 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 + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2012 -All rights reserved No reproductic etworking permitted without license from IHS Not for Resale ISO 10770-2:2012(E) Contents Page Foreword ..iv Introduction 1 Scope 2 Normative references 3 Terms, definitions, symbols and units 3.1 Terms and definitions.. 3.2 Symbols and units. 4 Standard test conditions .3 5 Test installation 3 6 Accuracy. 5 6.1 Instrument accuracy. .5 6.2 Dynamic range. 5 7 Electrical tests for valves without integrated electronics 5 7.1 General... 5 7.2 Coil resistance ... 5 7.3 Coil inductance -Optional test 7.4 Insulationresistance.. 8 Performance tests 8.1 Steady-state tests 8.2 Dynamic tests.. 21 9 Pressure impulse test. .28 10 Presentation of results.. .28 10.1 General.... 28 10.2 Test reports... 29 11 Identification statement (reference to this part of Is0 10770) 30 AnnexA (informative) Testing guidance.... 31 ili e with I ut license from IHS Not for Resale