ISO INTERNATIONAL STANDARD 19973-2 Second edition 2015-09-01 Pneumatic fluid power Assessment of component reliability by testing Part 2: Directional control valves Transmissions pneumatiques - Evaluation par essais de la fiabilite des composants- Partie 2: Distributeurs Reference number IS0 19973-2:2015(E) ISO International Organization for Standardization @ IS0 2015 dardization5956617 IS0 19973-2:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenatinair PrganizationforStandardization etworking permitted without license from IHS IS0 19973-2:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Symbols and units ..2 5 Test equipment. .2 5.1 Basic test equipment .2 5.2 Connecting piping and volume. 5.3 Simultaneous operation of multiple pneumatically operated valves .4 6 Test conditions .4 6.1 General test conditions 6.2 Initial condition .4 6.3 Cycling frequencies .4 7 Test procedures. 7.1 Timing of checks and measurements 6 7.2 Type and scope of checks and measurement 7.2.1 Functional check. .6 7.2.2 Measurement of leakage 7.2.3 Measurement of shifting pressures .6 8 Failure criteria and threshold levels ..8 8.1 General ..8 8.2 Functional failure .8 8.3 Failure due to leakage .8 8.4 Failure due to shifting pressures .9 8.5 Customised agreements. .9 9 Data analysis .9 10 Test report ..9 11 Identification statement (reference to this part of Is0 19973) ..10 Annex A (informative) Test data sheet .11 Bibliography .14 iii nsee=Zhejiang Institute of Standardization 5956617 vided by IHS under lic ithout license from IHS