ISO INTERNATIONAL STANDARD 10434 Third edition 2020-08 Bolted bonnet steel gate valves for the petroleum, petrochemical and allied industries Robinets-vannes enacierachapeauboulonne pourles industries du pétrole, delapétrochimieetles industriesconnexes Referencenumber IS010434:2020(E) ISO @ISO 2020 IS0 10434:2020(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: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2020 - All rights reserved IS0 10434:2020(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references 3 Terms and definitions 4 Pressure/temperatureratings Design .4 5 5.1 Body wall thickness 4 5.2 Bonnet wall thickness ..5 5.3 Body dimensions .6 5.3.1 Flanged ends .6 5.3.2 Butt-welding ends. .7 5.3.3 Body seats.. ..9 5.4 Bonnet dimensions. .10 5.5 Bonnet-to-body joint. .11 5.6 Gate .12 5.7 Yoke. .13 5.8 Stem and stem nut. .13 5.9 Packing and packing box .15 ..16 5.10 Bolting. 5.11 Operation .16 5.12 Auxiliary connections. ..17 6 Materials .19 6.1 Materials other than trim materials .19 6.2 Trim materials. .20 6.3 Welding for fabrication and repair .22 7 Testing,inspectionandexamination .23 7.1 Pressure tests. 23 7.1.1 General. 23 7.1.2 Shell test 23 7.1.3 Closure tightness test. 23 7.1.4 Optionalbackseattightnesstest .25 7.1.5 Optional closure tightnesstest. 25 7.1.6 Fugitive emission testing 25 7.2 Inspection 26 7.2.1 Extent of inspection. 26 7.2.2 Site inspection. 26 7.3 Examination. 26 7.4 Supplementary examination .26 8 Marking .26 8.1 Legibility .26 8.2 .27 Bodymarking 8.3 Ring joint marking. .27 8.4 Identificationplatemarking. .27 8.5 Special markingforunidirectional valves .27 9 Preparationfor despatch .28 AnnexA (informative)Informationtobe specifiedbythepurchaser .29 .31 AnnexB(informative)Identificationofvalveterms AnnexC(informative)Valvematerialcombinations .34 @ IS0 2020 -All rights reserved ii