ISO INTERNATIONAL STANDARD 17879 First edition 2017-07 Gas cylinders Self-closing cylinder valves Specification and type testing Bouteilles a gaz - Robinets de bouteilles équipés de clapets auto obturants-Spécifications et essais de type Reference number IS017879:2017(E) so International Organization for Standardization @ IS0 2017 vided by IHS underI ted without license from IHS IS0 17879:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, 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. ISOcopyrightoffice 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 Internatinair PrganizationforStandardization @ IS0 2017 - All rights reserved etworking permitted without license from IHS IS0 17879:2017(E) Contents Page Foreword ..iv Introduction. .. 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Valve description ..3 5 Valve design requirements ..4 5.1 General. .4 5.2 Materials.... ..4 5.3 Valve connections .5 5.4 Mechanical strength ..6 5.4.1 Resistance to hydraulic burst pressure .6 5.4.2 Resistance to mechanical damage .. 6 5.5 Valve operating mechanism .6 5.6 Leakage. ..6 5.7 Resistance to ignition. .1 5.8 Resistance to acetylene flashback .7 5.9 Manufacturing tests and examinations. 7 6 Type testing. .8 6.1 General. .8 6.2 Documentation .9 6.3 Test samples 6.4 Test report.... .10 6.5 Test temperatures .10 6.6 Test pressures 10 6.6.1 Valve burst test pressure .10 6.6.2 Valve test pressure. ..10 6.7 Test gases. .11 6.7.1 Gas quality. .11 6.7.2 Leak tightness tests. .11 6.7.3 Endurance test .11 6.7.4 Oxygen pressure surge test. 11 6.8 Test schedule .11 6.9 Hydraulic burst pressure test .13 6.10 Leak tightness tests. .13 6.10.1 General. .13 6.10.2 Internal leak tightness test. .13 6.10.3 External leak tightness test. ..14 6.11 Endurance test ..14 6.12 Visual examination. .15 7 Marking ..15 Annex A (normative) Mechanical strength tests ..16 Annex B (normative) Acetylene tests ..19 Annex C (normative) Oxygen pressure surge test .20 Annex D (normative) Manufacturing tests and examinations ..21 Bibliography .22 iii ed without license from IHS