ISO INTERNATIONAL STANDARD 4437-4 Second edition 2022-11 Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) 一 Part 4: Valves Systemes de canalisations en plastique pour la distribution des combustibles gazeux Polyéthylene (PE) - Partie 4: Robinets Reference number IS0 4437-4:2022(E) [so IS02022 IS0 4437-4:2022(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2022 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 on or ISo's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2022 - All rights reserved