ASMEB16.34-2025 (Revision of ASME B16.34-2020) Valves - Flanged Threaded, and Welding End ANAMERICANNATIONALSTANDARD The American Society of Mechanical Engineers ASME B16.34-2025 (Revision of ASME B16.34-2020) Valves Flanged Threaded, and Welding End AN AMERICAN NATIONAL STANDARD The American Society of 312 Mechanical Engineers Two Park Avenue · New York, NY: 10016 USA Date of Issuance: May 30, 2025 The next edition of this Standard is scheduled for publication in 2028 This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The standards committee that approved the code or standard was balanced to ensure that individuals from competent and review and comment, which provided an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor does ASME assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. industryendorsementofthis codeorstandard. procedures and policies, which precludes the issuance of interpretations by individuals. The endnotes and preamble in this document (if any) are part of this American National Standard. ASME Collective Membership Mark 2 Al rights reserved."ASME" and the above ASME symbols are registered trademarks of The American Society of Mechanical Engineers. No part digital, or mechanical, now known or hereafter invented, without the express written permission of AsME. No works derived from this document orany contenttherein maybe created withoutthe express written permission of ASME.Using this documentorany contenttherein prohibited. TheAmerican Society of Mechanical Engineers Two Park Avenue, NewYork, NY 10016-5990 Copyright @ 2025 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Printed in U.S.A CONTENTS Foreword vi Committee Roster x Correspondence With the B16 Committee xi Introduction xili Summary of Changes xiv List of Changes in Record Number Order xxi 1 General 1 2 Pressure-Temperature Ratings 2 3 NominalPipe Size 4 4 Marking 4 5 Materials 5 6 Dimensions 6 7 Pressure Testing 12 8 Requirements for Special Class Valves 13 Mandatory Appendices 1 Radiography Examination: Procedure and Acceptance Standards 195 II Magnetic ParticleExamination:Procedureand AcceptanceStandards 197 III LiquidPenetrantExamination:Procedure andAcceptanceStandards. 198 IV UltrasonicExamination:ProcedureandAcceptanceStandards 199 V RequirementsforLimitedClassValves. 200 VI BasisEquationsforMinimumWallThickness 203 VII References 205 Nonmandatory Appendices A Relationship Between Nominal Pipe Size and Inside Diameter 209 B Method Used for Establishing Pressure-Temperature Ratings 211 c Quality System Program . 219 D Low-Temperature Applications . 220 Figures 1 Method of Designating Location of Auxiliary Connections When Specified 16 2 Butterfly Valve Body . 17 3 Thread Length for Auxiliary Connections . 18 4 Bosses for Auxiliary Connections 18 5 Socket Welding for Auxiliary Connections 19 6 Butt Welding for Auxiliary Connections 19 7 Gate Body (Pressure Seal Bonnet) 20 ii 20 8 YPatternGlobeBody(Pressure Seal Bonnet) 9 Angle Body (Pressure Seal Bonnet): Bonnet Same As Y Pattern Globe 21 10 Elbow Down (Pressure Seal Bonnet) 21 11 Gate Body (Flanged Bonnet) . : 22 12 Globe Body (Flanged Bonnet) 22 13 Butterfly Body .... 23 14 Plug Body ...... 23 15 Conduit Gate Body (Pressure Seal Bonnet) 24 16 Dished Cover ..... 24 17 Flat Cover... 24 18 Top Entry Ball Valve .. . 25 19 Swing Check. 25 V-1 Limited Class Stress AreaLimits 201 Tables 1 Material Specification List: Applicable ASTM Specifications 26 2-1.1 Ratings for Group 1.1 Materials SI Units .... 34 2-1.1C Ratings for Group 1.1 Materials - U.S. Customar