ISO INTERNATIONAL STANDARD 15761 Second edition 2020-08 Steel gate, globe and check valves for sizes DN 100 and smaller, for the petroleum and natural gas industries Robinets-vannes,robinets a soupape et clapets denon retour en acier de dimensions DN 100 et inferieures, pour les industries du petrole et dugaznaturel Referencenumber IS0 15761:2020(E) ISO @ISO 2020 IS0 15761:2020(E) COPYRIGHTPROTECTEDDOCUMENT @IS02020 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 memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS015761:2020(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Pressure/temperature ratings 4.1 Valve ratings .3 4.2 Temperature constraints ..4 Design 5 ..4 5.1 Reference design 4 5 5.2 Flow passageway 5.3 Wall thickness. .6 5.4 Valve body. 5.4.1 General. 7 5.4.2 Socket welding ends 7 5.4.3 Threaded ends .8 5.4.4 Flanged ends .9 5.4.5 Butt-welding ends. .10 5.4.6 Body seats. .11 5.5 Valvebonnet orcover .11 5.6 Obturator .13 5.6.1 Seating surfaces. .13 5.6.2 Gate valve obturators. .13 5.6.3 Globe valve obturators. .13 5.6.4 Check valve obturators ..13 5.7 Stem. .14 5.8 Stem nut or stem bushing. .16 5.9 Packing,packing chamber, and gland .16 5.10 Packing retention .17 5.11 Handwheel .17 Materials .17 6 6.1 Trim materials .17 6.2 Materials other than trim .17 7 Marking .18 7.1 Legibility. .18 7.2 Body marking .18 7.3 Ring joint groove marking. 20 7.4 Identification plate marking 20 7.5 Weld fabrication marking. .21 8 Testing and inspection .21 8.1 Pressure tests. .21 8.1.1 General 21 8.1.2 Shell test 22 Closure leakage test. .22 8.1.3 8.1.4 Optionalclosureleakagetestforgatevalves 23 8.1.5 Backseat leakagetest 23 8.1.6 Fugitiveemissiontesting 23 8.2 Inspection 24 9 Preparation fordespatch. .24 Annex A (normative) Requirements for extended bodygatevalvebodies ..25 @IS0 2020 -All rights reserved iii