ISO INTERNATIONAL STANDARD 19973-4 Second edition 2014-03-01 Pneumatic fluid power Assessment of component reliability by testing Part 4: Pressure regulators Transmissions pneumatiques - Evaluation par essais de la fiabilite des composants - Partie 4: Regulateurs de pression Reference number IS0 19973-4:2014(E) LSO @ IS0 2014 Not for Resale IS0 19973-4:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2014 All rights reserved. Unless otherwise specified, 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 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. IsOcopyrightoffice Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved networking permitted without license from IHS Not for Resale IS0 19973-4:2014(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references 3 Terms and definitions ..2 4 Symbols and units ..2 5 Test equipment. .2 5.1 Basic test equipment .2 5.2 Directional control valve .4 5.3 Volumes .4 6 Test conditions .4 6.1 General test conditions .4 6.2 Inlet and regulated pressures .5 7 Test procedure. .5 7.1 Timing of checks and measurements. .5 7.2 Type and scope of checks and measurements 5 7.3 Endurancetest .5 8 Failure criteria and threshold levels .1 8.1 General 1 8.2 Functional failure .7 8.3 Failure due to leakage 7 8.4 Failureduetopressurecharacteristics. 8.5 Customised agreements. .7 9 Data analysis ..7 10 Test report. .8 11 Identification statement (reference to this part of Is0 19973) ..8 Annex A (informative) Flow chart illustrating the test procedure specified in this part of IS019973 .9 Annex B (informative) Optional expanded test circuit ..10 Annex C (informative) Test data sheet ..12 Bibliography ..16 iii se with ISt thout license from IHS Not for Resale