GATE VALVES FOR FIRE - PROTECTION SERVICE

UL 262 ISBN 0-7629-0952-8

Gate Valves for Fire-Protection Service

N G E S H S I M I M H i S h , S T D e c L i c R y C O B M d C H A e 8 a d N T E : 0 0 o o l w n K U A 7 - 3 o D B y 0 0 s 2 2 a 3 / W U s e / 1 1 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA U L C O P Y R IG IG H T IA L – N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO IO N O R D I S T R IB IB U T I O N W I T H O U T P E R M I S S IO IO N F R O M U L

N G E S H S I M I M H i S h , S T D e c L i c R y C O B M d C H A e 8 a d N T E : 0 0 o o l w n K U A 7 - 3 o D B y 0 0 s 2 2 a 3 / W U s e / 1 1 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA U L C O P Y R IG IG H T IA L – N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO IO N O R D I S T R IB IB U T I O N W I T H O U T P E R M I S S IO IO N F R O M U L

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FEBRUARY 26, 2004 − UL 262

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Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook, IL 60062-2096 UL Standard for Safety for Gate Valves for Fire-Protection Service, UL 262 Eighth Edition, Dated February 26, 2004 Summary of Topics This new edition of UL 262 is a periodic re-issuance to ensure that UL’s Standards remain up to date with regard to format and editorial issues such as numbering, pagination, and cross referencing. The requirements are substantially in accordance with UL’s Bulletin(s) on this subject dated December 3, 2003 . The bulletin(s) is now obsolete and may be discarded. As indicated on the title page (page1), this UL Standard for Safety has been adopted by the Department of Defense. The master for this Standard at UL’s Northbrook Office is the official document insofar as it relates to a UL service and the compliance of a product with respect to the requirements for that product and service, or if there are questions regarding the accuracy of this Standard. UL’s Standards for Safety are copyrighted by UL. Neither a printed copy of a Standard, nor the distribution diskette for a Standard-on-Diskette and the file for the Standard on the distribution diskette should be altered in any way. All of UL’s Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. Revisions of UL Standards for Safety are issued from time to time. A UL Standard for Safety is current only if it incorporates the most recently adopted revisions.

N G E H UL provides this Standard ″ as is″ without warranty of any kind, either expressed or implied, including but S I not limited to, the implied warranties of merchantability or fitness for any purpose. I M H i S In no event will UL be liable for any special, incidental, consequential, indirect or similar h damages, including loss of profits, lost savings, loss of data, or any other damages arising out of the use of D or the , S e T c inability to use this Standard, even if UL or an authorized UL representative has been advised i L of the R Oprice paid for possibility of such damage. In no event shall UL’s liability for any damage ever y exceed the C B this Standard, regardless of the form of the claim. M d C H A e E 0 8 a d of Nits TStandards. o : However, this UL will attempt to answer support requests concerning electronic l versions 3 A n support service is offered on a reasonable efforts basis only, may not be able to resolve every o wand yUL K U support request. UL supports the electronic versions of D its Standards only 0 if 7 they are used under the 0 B s conditions and operating systems for which it is a intended. / 2 policies may change from eUL’s support 3 s W time-to-time without notification. n t o r U : 8 / 1 e F file 9types and formats, delivery methods and u m presentation, UL reserves the right to change the c format, 3 0 without prior notice. formats, and the like of both its printed Standards D o and electronic 1E 2 U L C O P Y R IG H T D M A T E R IA L – N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L

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FEBRUARY 26, 2004 − UL 262

Purchasers of the electronic versions of UL’s Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgement (including reasonable attorney’s fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchaser’s computer system. If a single-user version electronic Standard was purchased, one copy of this Standard may be stored on the hard disk of a single personal computer, or on a single LAN file-server or the permanent storage device of a multiple-user computer in such a manner that this Standard may only be accessed by one user at a time and for which there is no possibility of multiple concurrent access. If a multiple-user version electronic Standard was purchased, one copy of the Standard may be stored on a single LAN file-server, or on the permanent storage device of a multiple-user computer, or on an Intranet server. The number of concurrent users shall not exceed the number of users authorized. Electronic Standards are intended for on-line use, such as for viewing the requirements of a Standard, conducting a word search, and the like. Only one copy of the Standard may be printed from each single-user version of an electronic Standard. Only one copy of the Standard may be printed for each authorized user of a multiple-user version of an electronic Standard. Because of differences in the computer/software/printer setup used by UL and those of electronic Standards purchasers, the printed copy obtained by a purchaser may not look exactly like the on-line screen view or the printed Standard. An employee of an organization purchasing a UL Standard can make a copy of the page or pages being viewed for their own fair and/or practical internal use. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, figures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a ″ SUPERSEDED REQUIREMENTS″ notice. A change in an effective date is indicated by a note following the affected item, and giving both the previous effective date and the new date the requirement becomes effective. New product submittals made prior to a specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective date, unless the applicant specifically requests that the product be judged under the current requirements. However, if the applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Listing and Follow-Up Services after the effective date, and understanding of this should be signified in writing.

N G E S H I I M H i S Copyright © 2004 Underwriters Laboratories Inc. h , S T D e This Standard consists of pages dated as shown in the following checklist: i c L R y C O B Page M Date d C H A e E 0 8 a d . T : 26, 2004 1-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l . . o . . . . . . . . N . . . . . . . February 3 A n o w y K U 0 7 D s e B / 2 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L


February 26, 2004 1 UL 262 Standard for Gate Valves for Fire-Protection Service The first edition was covered by two standards titled Outside Screw and Yoke Gate Valves and Inside Screw Valves for Underground Work, numbered UL 262B and UL 262A, respectively. The second edition was titled Outside Screw and Yoke Gate Valves and numbered UL 262B. First Edition – March, 1931 Second Edition – August, 1950 Third Edition – June, 1966 Fourth Edition – May, 1973 Fifth Edition – April, 1980 Sixth Edition – November, 1988 Seventh Edition – May, 1994 Eighth Edition February 26, 2004 The Department of Defense (DoD) has adopted UL 262 on August 10, 1989 . The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. An effective date included as a note immediately following certain requirements is one established by Underwriters Laboratories Inc.

N G E S H I I M H i S h ISBN 0-7629-0952-8 , S T D e i c L COPYRIGHT © 1980, 2004 UNDERWRITERS LABORATORIES INC. R y C O B M d C H A e a d N T E : 0 8 o l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T

Revisions of this Standard will be made by issuing revised or additional pages bearing their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements.

N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L

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GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262

FEBRUARY 26, 2004

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N G E S H I I M H i S h , S T D e i c L R y C O B M d C H A e a d N T E : 0 8 o l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L


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CONTENTS

FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6. INTRODUCTION 1 2 3 4

Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Units of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 Undated References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

CONSTRUCTION 5 Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 6 Rated Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 7 Bodies and Bonnets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 8 Valve Operation Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 9 Gates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 10 Seating Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 11 Stems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 12 Stuffing Boxes and Stem Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 13 Handwheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 14 Wrench Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 15 Indicator Post Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 PERFORMANCE 16 17 18 19 20

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Metallic Materials Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 10-Day Moist Ammonia Air Stress Cracking Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Elastomeric Parts (Except Gaskets) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Tests on Organic Coating Materials for Seating Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 20.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 20.2 Air oven exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 20.3 Water immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 20.4 Sodium chloride immersion ....................................................18 20.5 Potassium biphthalate immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 20.6 Sodium carbonate immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 20.7 Impact test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Resilient Seat Material Securement Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Resilient Seat Cycling Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Stuffing Box Repacking Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 Leakage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 Friction Loss Test for Valves Having Reduced Waterways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Mechanical Strength Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Hydrostatic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

N G E S H I I M H i S h 21 , S T D e 22 i c L R 23 y C O B 24 M d C H A e 25 a d N T E : 0 8 o 26 l 27 w n K U A 7 - 3 o D B y 0 0 s 2 MANUFACTURING AND PRODUCTION TESTS a W U s e / 1 3 / t n . r 28 General . . . . . . . . . . . . . . . . . . . . . . . e . . . . . . . . . o . . . . . . . . . : . 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23 F m 9 3 c u o 0 2 D 1E D M A T E R IA L – U L C O P Y R IG H T N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L

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MARKING 29 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24



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FOREWORD A. This Standard contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below and in the Scope section of this Standard. These requirements are based upon sound engineering principles, research, records of tests and field experience, and an appreciation of the problems of manufacture, installation, and use derived from consultation with and information obtained from manufacturers, users, inspection authorities, and others having specialized experience. They are subject to revision as further experience and investigation may show is necessary or desirable. B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued coverage of the manufacturer’s product. C. A product which complies with the text of this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, it is found to have other features which impair the level of safety contemplated by these requirements. D. A product employing materials or having forms of construction which conflict with specific requirements of the Standard cannot be judged to comply with the Standard. A product employing materials or having forms of construction not addressed by this Standard may be examined and tested according to the intent of the requirements and, if found to meet the intent of this Standard, may be judged to comply with the Standard. E. UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of UL represent its professional judgment given with due consideration to the necessary limitations of practical operation and state of the art at the time the Standard is processed. UL shall not be responsible to anyone for the use of or reliance upon this Standard by anyone. UL shall not incur any obligation or liability for damages, including consequential damages, arising out of or in connection with the use, interpretation of, or reliance upon this Standard. F. Many tests required by the Standards of UL are inherently hazardous and adequate safeguards for personnel and property shall be employed in conducting such tests.



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INTRODUCTION 1 Scope 1.1 These requirements cover gate valves intended for installation in piping systems supplying water for fire-protection service. Gate valves covered by these requirements are of the outside-screw-and-yoke type or of the nonrising stem type, the latter for installation either above or below ground. 1.2 The gate valves covered by these requirements are intended for installation and use in accordance with the Standards for: a) Low Expansion Foam , NFPA 11; b) Installation of Sprinkler Systems, NFPA 13; c) Installation of Standpipe and Hose Systems, NFPA 14; d) Water Spray Fixed Systems for Fire Protection, NFPA 15; e) Deluge Foam-Water Sprinkler and Foam-Water Spray Systems, NFPA 16; f) Installation of Centrifugal Fire Pumps, NFPA 20; g) Water Tanks for Private Fire Protection, NFPA 22; and h) Installation of Private Fire Service Mains and Their Appurtenances, NFPA 24. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.2 A component is not required to comply with a specific requirement that:

N G E S H I b) Is superseded by a requirement in this standard. I M H i S of 2.3 A component shall be used in accordance with its rating established for the intended conditions h use. , S T D e i c L R Ocapabilities. 2.4 Specific components are incomplete in construction features or restricted in y performance C B Such components are intended for use only under limited conditions, such M not Htemperatures A C e das certain exceeding specified limits, and shall be used only under those specific d conditions. a N T E : 0 8 o l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or


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3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 5 Sizes 5.1 A gate valve of the outside-screw-and-yoke type shall be constructed for use with standard pipe of trade size 1/2 inch or larger. A gate valve of the nonrising stem type shall be constructed for use with standard pipe of trade size 2-1/2 inches or larger. 5.2 Valve sizes refer to the nominal diameter of the waterway through the inlet and outlet connections and to the pipe size for which the connections are intended. Exception: A 1/2 inch size valve may consist of a 3/4 inch valve assembly having 1/2 inch pipe threads tapped in the metal of the body. 6 Rated Pressure 6.1 A gate valve shall be constructed for a minimum rated pressure of: a) 175 psig (1206 kPa) for sizes 12 inches (305 mm) or smaller; and b) 150 psig (1034 kPa) for sizes 14 inches (355 mm) or larger. 7 Bodies and Bonnets

N G E S H I M H I Exception: A gate valve providing a waterway having a diameter less than the diameter of the S mating pipe is acceptable, if the valve incorporating such a waterway complies with the requirements h i of the S Friction Loss Test for Valves Having Reduced Waterways, Section 25. e , T D c i L R 7.2 The body and bonnet of a valve shall be made of materials having strength, rigidity, O and resistance y B H C M to corrosion at least equivalent to cast iron or bronze. d d e T E C 0 8 A a o A : defects of any 7.3 A casting shall be smooth and free from scale, lumps, cracks, l blisters, sand N holes, 3and n nature that make it unfit for the intended use. A casting shall not be or filled, but may be o w y K Uplugged 7 impregnated to remove porosity. D s e B / 2 0 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T 7.1 The body of a valve shall be of the straightway type and shall provide, when the gate is fully open, a waterway diameter equal to or greater than the inside diameter of a mating pipe. The diameter measurement is to be made at points away from projecting lugs used for the seat ring assembly.



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7.4 Guides shall be cast integrally with the body. If the gate can be assembled in other than the intended manner, the guides shall be of unequal width, or other equivalent means shall be provided to facilitate correct assembly. 7.5 The dimensions of all flanges, flange pipe joints, grooves, and threaded body openings shall conform to the following standards, as applicable: a) Fittings, 3 – 48 inches, (76.2 – 1219 mm) for Water and Other Liquids, Gray Iron and Ductile Iron, ANSI/AWWA C110/A21.10. b) Rubber Gasket Joints for Ductile-Iron and Gray-Iron Pressure Pipe and Fittings, ANSI/ AWWA C111/A21.11. c) Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250, and 800, ANSI/ASME B16.1. d) Forged Steel Fittings, Socket Welding and Threaded, ANSI/ASME B16.11. e) Steel Pipe Flanges for Waterworks Service, 4 – 144 Inches (101.6 – 3657.6 mm), ANSI/ AWWA C207, for valves having a maximum rated pressure of 175 psig (1206 kPa); Pipe Flanges and Flanged Fittings, Steel Nickel Alloy and Other Special Alloys, ANSI/ASME B16.5, for valves having a maximum rated pressure greater than 175 psig (1206 kPa). 7.6 The body and the bonnet of a valve shall be fastened together in a manner that permits access to the internal parts. 7.7 An outside-screw-and-yoke valve shall be constructed so that the hand cannot be jammed between a yoke and the handwheel. 7.8 The load on any bolt, exclusive of the force required to compress the gasket, shall not exceed the minimum tensile strength specified in Table 2 of the Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength, ASTM A307, when the valve is pressurized to five times the rated pressure for 6-inch (152-mm) or smaller valves and to four times the rated pressure for 8-inch (203-mm) or larger size valves. The area of the application of pressure is to be calculated as follows:

N G E S H I I M H b) If an ″ O″ ring seal or ring gasket is used, the area of force application is that extending out i S of the center line of the ″ O″ ring or gasket. h , S T D e i c L R y C O B M d C H A e a d N T E : 0 8 o l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T a) If a full-face gasket is used, the area of force application is that extending out to a line defined by the inner edge of the bolts.


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8 Valve Operation Feature 8.1 An outside-screw-and-yoke valve shall be provided with a handwheel to facilitate operation. 8.2 A nonrising stem valve shall be provided with a wrench nut (see Section 14, Wrench Nuts). A flange (see Section 15, Indicator Post Flanges) for connection to an indicator post shall also be provided unless the valve is intended for connection to a roadway box in a field installation. 9 Gates 9.1 The gate for a valve shall be of cast iron or other material having at least equivalent corrosion resistance. 9.2 The central part of a gate for a valve larger than 1 inch (25.4 mm) shall be recessed. 9.3 Any cast iron surface of a gate shall be so constructed as to clear the body seat ring in all positions. 9.4 For a cast iron gate for an iron-bodied valve, guides or links shall be provided to reduce the risk of the gate-ring seating surfaces rubbing on the body or bonnet during operation. 10 Seating Surfaces 10.1 For a valve having a metal-to-metal seating surface, all seating surfaces of the gate and body shall be of bronze or material having at least equivalent corrosion resistance; 10.2 A seating surface that is contacted by a resilient material shall: a) Be made of bronze or other metal having at least equivalent corrosion resistance, or b) Have a protective organic coating complying with Tests on Organic Coating Materials for Seating Surfaces, Section 20. 11 Stems

N G E S H I 11.2 Stem threads shall be Acme, modified Acme, half ″ V,″ or square. I M H i Swhen 11.3 The connection between a stem and its gate shall be aligned so that the stem is not bound h the gate is seated. , S T D e i c L R O at least 11.4 A stem nut shall be of material having strength, wear resistance, and corrosion y resistance C B equivalent to bronze. M d C H A e 8 a d enter T Ethe stem 0 o : 11.5 The stem of a nonrising stem valve shall, when the valve is closed, nut a distance N l 3 A n equal to at least 1-1/4 (31.75 mm) times the outside diameter w stem. U 7 o of the K D s e B y / 2 0 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T 11.1 A stem shall be made of material having strength and resistance to corrosion at least equivalent to bronze.



FEBRUARY 26, 2004


11

11.6 A 5-inch (127-mm) or larger outside-screw-and-yoke valve shall be provided with a bronze washer between the yoke and the handwheel, unless the construction of the stem nut does not permit the yoke and handwheel to come into contact. 11.7 The stem of a nonrising stem valve shall be attached to the wrench nut by means such as a square-tapered end or pinning the nut to the stem. If the stem is not provided with a square taper, the means of attachment shall be constructed of material having corrosion resistance at least equivalent to brass, bronze, or stainless steel. 12 Stuffing Boxes and Stem Seals 12.1 A valve shall include a stuffing box, or other means for sealing, to prevent leakage at the valve stem. 12.2 A stuffing box, when used, shall be provided with a removable, shouldered, unthreaded follower gland retained by bolts or studs. Bolts or studs employed for retaining a gland for a stuffing box may be of bronze, iron, or steel, but shall in all cases engage nuts or other threaded sections of bronze or other equivalent corrosion resistant material. 12.3 The width of the annular recess in a stuffing box between the stem and the inner wall shall be not less than 22 percent of the diameter of the stem, and in no case less than 1/8 inch (3.2 mm). 12.4 A stem seal employing formed rubber rings shall be constructed to include at least two rings. The bolts and nuts for o-ring type stem seals shall be made of stainless steel, bronze, iron, steel, or other material. 13 Handwheels 13.1 A handwheel shall be constructed to be readily grasped by the hands. 13.2 An arrow showing the direction to turn the handwheel to open the valve, with the word ″ OPEN″ at the feather end or in a break in the shaft, shall be cast on the handwheel and be easily readable. See Figure 13.1. Thisisgeneratedtextforfigtxt.


12


FEBRUARY 26, 2004

Figure 13.1 Handwheel detail

13.3 The arrow shall be not less than 1-1/4-inches (32-mm) long for a valve of 2-1/2-inch (64-mm) size and smaller; 2-1/2-inches (64-mm) long for a valve of 3, 4, and 5 inch (76, 102, and 127 mm) size; and 4 inches (102 mm) long for a valve of 6 inch size and larger. If the shaft is broken to admit the word ″ OPEN,″ the sum of the parts of the arrow shall have a length at least three-fourths as long as that specified for the unbroken arrow. 13.4 The outside diameter of a handwheel shall be not less than the sizes specified in Table 13.1.

N G E S H I I M Nominal valve size Diameter of handwheel H i S (mm) Inches (mm) h S D ,(67) e (12.7, 19) 2-5/8 i c (67) L T (25.4) 2-5/8 R y C O (32) 3 (76) B M H d (38.1) 3-1/4 (83) A C e d T E 0(89) 8 (51) 3-1/2 a o : N l (64) 4-3/8 (121) U A 7 - 3 (152) w n (76) 6 K o D B7 y 0 (89) (178) 0 s 2 a / e (102) (203) W U s 8 / 1 3 t (127) 10 (254) 8 e n F o r : (152) 11 (279) m 9 u 3 c (330) o(203) 0 13 2 D 1E D M A T E R IA L – U L C O P Y R IG H T Table 13.1 Minimum handwheel diameters

Inches 1/2, 3/4 1 1-1/4 1-1/2 2 2-1/2 3 3-1/2 4 5 6 8

N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W13.1 ITH OUT PE MIS S IO N F R O M U L Table Continued onRNext Page


FEBRUARY 26, 2004


13

Table 13.1 Continued Nominal valve size

Diameter of handwheel

Inches

(mm)

Inches

(mm)

10

(254)

15

(381)

12

(305)

16

(406)

14

(356)

17

(432)

16

( 406)

18

(457)

14 Wrench Nuts 14.1 The wrench nut for a nonrising stem valve shall be made of material having strength and resistance to corrosion at least equivalent to cast iron. It shall be fitted to the end of the stem and shall be secured by a means such as a nut, pin, key, or cap screw. 14.2 A wrench nut shall be 1-15/16-inches (49-mm) square at the top and 2-inches (51-mm) square at the base of a section 1-3/4-inches (45-mm) high. The nut shall include a flanged base upon which shall be cast an arrow at least 2-inches (51-mm) long, showing the direction of opening and the word ″ OPEN ″ in distinct letters at least 1/2 inch (12.7 mm) high. See Figure 14.1. Thisisgeneratedtextforfigtxt.

Figure 14.1 Wrench nut


14


FEBRUARY 26, 2004

15 Indicator Post Flanges 15.1 A nonrising stem type valve intended for connection to an indicator post shall have a flange cast on the bonnet for attaching an indicator post to the valve, or have an intermediate annular flange of standard dimensions arranged for bolting to a supporting flange cast integral with the bonnet. 15.2 The flange intended for connection to an indicator post shall be circular or square and shall have the major dimensions and bolt-hole locations as shown in Figure 15.1. The flange shall be of material having the strength, rigidity, and resistance to corrosion equivalent to 5/8 inch (15.9 mm) thick cast iron and shall be drilled for four 5/8 inch (15.9 mm) bolts. Thisisgeneratedtextforfigtxt.

Figure 15.1 Indicator post flange

N G E S H I I M H S i h 15.3 The flange intended for connection to an indicator post shall be provided with at least two holes, S 2 , each having a minimum area of 0.19 square inches (127 mm ), for drainage of the indicator The e post. T Dfield c i L drain holes may be constructed to allow plugging if a watertight construction is required for specific R O y installations. B H C M d d e T E C 0 8 A a : N l o A 3 n o w y K U 0 7 D s e B / 2 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L


FEBRUARY 26, 2004


15

PERFORMANCE 16 General 16.1 Representative samples of each size gate valve shall be subjected to the tests described in these requirements. Test bars of metal used in castings and additional samples of parts constructed of nonmetallic materials, such as rubber seal rings, are required for physical and chemical tests. 17 Metallic Materials Test 17.1 Specimen bars of metals used shall be prepared from the same heat or run of metal used in making the bodies and bonnets of valve samples submitted for investigation and test. The specimen bars shall conform to the minimum physical property requirements of the latest edition of the applicable ASTM or nationally recognized specifications. 18 10-Day Moist Ammonia Air Stress Cracking Test 18.1 After being subjected to the conditions described in 18.2 – 18.4, a brass part containing more than 15 percent zinc when examined using 25X magnification shall: a) Show no evidence of cracking; or b) Comply with the Leakage Test, in Section 24, if there is evidence of cracking. 18.2 Each test sample is to be subjected to the physical stresses normally imposed on or within a part as the result of assembly with other components. Such stresses are to be applied to the sample prior to and maintained during the test. Samples with threads, intended to be used for installing the product in the field, are to have the threads engaged and tightened to the torque specified in Table 18.1. Teflon tape or pipe compound are not to be used on the treads. Table 18.1 Torque requirements for threaded connections Nominal thread size

Torque

N G E 1 (25.4) 1200 (135.6) S H I 1-1/4 (32) 1450 (163.8) I M H 1-1/2 (38) 1550 (175.1) i S 2 (51) 1650 (186.4) h 2-1/2 (64) 1750 (197.7) , S T D e 3 (76) 1800 i c (203.4) L R y C O 18.3 Three samples are to be degreased and then continuously exposed in a B set position for ten days to M H d A C e a moist ammonia-air mixture maintained in a glass chamber approximately by E 12 by 12 inches (305 by d 12 T 8 a 0 305 by 305 mm) having a glass cover. o : N l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T Inches

(mm)

Pound-inches

(N·m)


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FEBRUARY 26, 2004

18.4 Approximately 600 ml of aqueous ammonia having a specific gravity of 0.94 is to be maintained at the bottom of the glass chamber below the samples. The samples are to be positioned 1-1/2 inches (38.1 mm) above the aqueous ammonia solution and supported by an inert tray. The moist ammonia-air mixture in the chamber is to be maintained at atmospheric pressure and at a temperature of 93°F (34°C). 19 Elastomeric Parts (Except Gaskets) Test 19.1 An elastomeric part used to provide a seal shall have the following properties when tested as specified in the Standard for Gaskets and Seals, UL 157: a) For silicone rubber (having poly-organo-siloxane as its constituent characteristic), a minimum tensile strength of 500 psi (3.4 MPa) and a minimum ultimate elongation of 100 percent. b) For natural rubber and synthetic rubber other than silicone rubber, a minimum tensile strength of 1500 psi (10.3 MPa) and minimum ultimate elongation of 150 percent; or a minimum tensile strength of 2200 psi (15.2 MPa) and a minimum ultimate elongation of 100 percent. c) Those properties relating to maximum tensile set; minimum tensile strength and elongation after oven aging; and hardness after oven aging, all as specified in UL 157. The maximum service temperature used to determine the oven time and temperature for oven aging is considered to be 60°C (140°F). 19.2 The Standard for Gaskets and Seals, UL 157, provides for the testing of either finished elastomeric parts or sheet or slab material. Sheet or slab material is to be tested when the elastomeric parts are O-rings having diameters of less than 1 inch (25.4 mm). The material tested is to be the same as that used in the product, regardless of whether finished elastomeric parts or sheet or slab material is tested. 20 Tests on Organic Coating Materials for Seating Surfaces 20.1 General 20.1.1 Organic coating material used as a seating surface shall show no signs of disbondment or blistering when tested as specified in 20.2 – 20.6, shall show no evidence of base metal corrosion outside the scribed area when tested as specified in 20.3, and shall show no signs of cracking when tested as specified in 20.7.1. For these purposes, ″ cracking″ does not include surface crazing.

N G E S H I I M H i S h , S T D e i c L R y C O B M d C H A e a d N T E : 0 8 o l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T



FEBRUARY 26, 2004


17

20.2 Air oven exposure 20.2.1 Four specimens of combined coating material/base material, each measuring 4 by 4 inches (102 by 102 mm), are to be used for this test. The thickness of the coating material and base material are to be equivalent to the thickness used in valve construction. The specimens are to be prepared in a manner that duplicates valve seat construction (surface roughness, application procedure, and the like). 20.2.2 The specimens are to be subjected to air-oven aging at 100 temperature determined in 20.2.4, as appropriate, for 180 days.

±1°C

(212

±2°F),

or at the

20.2.3 Following the exposure, the test specimens are to be visually examined for any evidence of disbondment or blistering of the coating. 20.2.4 If a coating material does not withstand the temperature specified in 20.2.2 without excessive deterioration, an air-oven aging test at a lower temperature for a longer period of time is to be applied. If a coating material is capable of withstanding a higher temperature than that specified in 20.2.2 without excessive deterioration, an air-oven aging test at a higher temperature for a shorter period of time, but not less than 30 days, is to be applied. The duration of exposure is to be calculated from the following equation: D = (184,000)e -0.0693t in which: D is the test duration in days, and t is the test temperature in °C 20.3 Water immersion 20.3.1 Four specimens of combined coating material/base material, each measuring 4 by 4 inches (102 by 102 mm), are to be used for this test. The thickness of the coating material and base material are to be equivalent to the thickness used in valve construction. The specimens are to be prepared in a manner that duplicates valve seat construction (surface roughness, application procedure, and the like).

G N E 20.3.2 On each specimen an ″ X ″ is to be scribed with a sharp instrument through the coating material S H to the base material surface with each scribe 3 ±0.25 inch (76 ±6 mm) long. The scribed test specimens I I M then are to be immersed in distilled water at a temperature of 70 ±1°C (158 ±2°F) for 90 days. H i S h 20.3.3 Following the exposure, the test specimens are to be visually examined for any S evidence of , e disbondment or blistering of the coating or any corrosion of base metal outside of the scribed areas. T D c i L R O y B H C M d d e T E C 0 8 A a : N l o A 3 n o w y K U 0 7 D s e B / 2 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L

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FEBRUARY 26, 2004

20.4 Sodium chloride immersion 20.4.1 Four specimens of combined coating material/base material, each measuring 4 by 4 inches (102 by 102 mm), are to be used for this test. The thickness of the coating material and base material are to be equivalent to the thickness used in valve construction. The specimens are to be prepared in a manner that duplicates valve seat construction (surface roughness, application procedure, and the like). 20.4.2 The test specimens are to be immersed in sodium chloride solution (2 percent by weight) at a temperature of 70 ±1°C (158 ±2°F) for 90 days. 20.4.3 Following the exposure, the test specimens are to be visually examined for any evidence of disbondment or blistering of the coating. 20.5 Potassium biphthalate immersion 20.5.1 Four specimens of combined coating material/base material, each measuring 4 by 4 inches (102 by 102 mm), are to be used for this test. The thickness of the coating material and base material are to be equivalent to the thickness used in valve construction. The specimens are to be prepared in a manner that duplicates valve seat construction (surface roughness, application procedure, and the like). 20.5.2 The test specimens are to be immersed in potassium biphthalate solution (pH=4) at a temperature of 70 ±1°C (158 ±2°F) for 90 days. 20.5.3 Following the exposure, the test specimens are to be visually examined for any evidence of disbondment or blistering of the coating. 20.6 Sodium carbonate immersion 20.6.1 Four specimens of combined coating material/base material, each measuring 4 by 4 inches (102 by 102 mm), are to be used for this test. The thickness of the coating material and base material are to be equivalent to the thickness used in valve construction. The specimens are to be prepared in a manner that duplicates valve seat construction (surface roughness, application procedure, and the like). 20.6.2 The test specimens are to be immersed in sodium carbonate solution (pH=10) at a temperature of 70 ±1°C (158 ±2°F) for 90 days.

N G E H 20.6.3 Following the exposure, the test specimens are to be visually examined for any evidence of S I disbondment or blistering of the coating. I M H i S h , S T D e i c L R y C O B M d C H A e a d N T E : 0 8 o l w n K U A 7 - 3 o D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T N O T A U T H O R I Z E D F O R F U R T H E R R E P R O D U C T IO N O R D I S T R IB U T I O N W I T H O U T P E R M I S S IO N F R O M U L


FEBRUARY 26, 2004


19

20.7 Impact test 20.7.1 Three specimens of combined coating material/base material as described in 20.2.1, or three samples of the actual part from the valve, are to be tested. The impact apparatus described in the Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact), ASTM D2794, is to be used for this test. Each specimen is to be subjected to an impact of 20 inch-pounds (2.3 J) using the 0.50 inch (12.7 mm) diameter hemispherical head. Following the impact the specimens are to be visually examined, without magnification, for any evidence of coating cracking. 21 Resilient Seat Material Securement Test 21.1 Resilient seat material of a gate valve shall withstand without separation, tearing, or permanent distortion the waterflow described in 21.2. 21.2 A representative size valve, in the approximately half open position, is to be subjected to a waterflow velocity of 15 feet per second (4.6 m/s) for 1 hour. Following the waterflow, the valve is to be visually examined for separation, tearing, or permanent distortion of the resilient material from the base metal. 21.3 The flow at 15 feet per second (4.6 m/s), as required in 21.2, is based upon the open area in Schedule 40 pipe of the same nominal size as the valve. 22 Resilient Seat Cycling Test 22.1 A gate valve incorporating a resilient seat material shall comply with the Leakage Test, Section 24, following the cycling described in 22.2. 22.2 The valve is to be subjected to 1000 cycles of operation at a maximum rate of 6 cycles of operation per minute, and in all instances the cycles are to be at a rate less than that at which water hammer damage could occur. A cycle of operation is to consist of valve operation from the fully-closed to the fully-open to the fully-closed positions. The valve is to be cycled using a hydrostatic pressure differential, equivalent to the valve rated pressure, applied across the valve gate when the valve is in the closed position. 23 Stuffing Box Repacking Test

N G E S H I I M H 23.2 The valve is to be connected to a hydrostatic pressure source and be wide open at rated pressure. S iwith The valve is then to be repacked and one seal ring replaced, in order to determine compliance the h S requirements in 23.1. e , T D c i R O L y B H C M d d e T E C 0 8 A a : N l o A 3 n o w y K U 0 7 D s e B / 2 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T 23.1 A valve shall permit repacking of the stuffing box or replacement of at least one seal ring when the valve is wide open and at rated pressure.


20


FEBRUARY 26, 2004

24 Leakage Test 24.1 A gate valve shall withstand, without leakage at joints, at the valve seat, or at the stuffing box or seal provided for the stem, an internal hydrostatic pressure of two times the rated pressure of the valve applied for 1 minute, or a pneumatic pressure at the valve’s rated working pressure applied for 1 minute. Exception: Slight leakage for a hydrostatically tested valve that does not exceed 1 fluid ounce (29.6 ml) per hour per inch of nominal valve size for a metal-to-metal gate seat or for a stem seal is acceptable. Slight leakage for a pneumatically tested valve past a metal-to-metal gate seat that does not exceed 0.1 cubic feet (2.83 dm 3 ) of air [at one atmosphere (101.3 kPa pressure) and 70°F (21.1°C)] per hour per inch (mm) of nominal valve size is acceptable. If such leakage does occur, the test is to be repeated three times to verify that such leakage does not exceed the specified acceptable amount during any of the repeated tests. 24.2 The torque values specified in Table 24.1 are the maximum values to be used to close a valve. Table 24.1 Maximum valve closing torque values Nominal valve size

Torque

Inches a

(mm)

Foot-poundsb

(N·m)

1/2, 3/4

(12.7, 19)

6

(8.16)

1

(25.4)

7

(9.52)

1-1/4

31.75)

8

(10.88)

1-1/2

(38)

9

(12.24)

2

(51)

20

(27.2)

2-1/2

(63.5)

28

(38.08)

3

(76.2)

52

(70.72)

4

(101.6)

75

(102)

6

(152)

110

(149.6)

8

(203)

150

(204)

10

(254)

185

(251.6)

12

(305)

225

(306)

14

(355)

225

(306)

16

(407)

275

(374)

N G E S H 1 inch = 25.4 mm I I M 1 foot-pound = 1.36 N·m H S i h 24.3 For a double-disc gate valve, the hydrostatic pressure is to be applied between the valve discs. For Sclosed , a solid-wedge gate valve, the hydrostatic pressure is to be applied between one end and the e T Dgate, c i the opposite end and the closed gate, and finally, in the bonnet with the gate opened. R O L y B H C M d d e T E C 0 8 A a : N l o A 3 n o w y K U 0 7 D s e B / 2 0 a W U s / 1 3 t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T a b



FEBRUARY 26, 2004


21

25 Friction Loss Test for Valves Having Reduced Waterways 25.1 A gate valve with a waterway having a diameter less than the nominal diameter of the mating pipe shall demonstrate a head loss not exceeding 0.5 psi (3.4 kPa) at a flow rate of 15 feet per second (4.6 m/s). 25.2 The flow at 15 feet per second (4.6 m/s), referred to in 25.1, is based upon the open area in Schedule 40 steel pipe of the same nominal size as the valve. 25.3 A sample gate valve is to be installed in its intended position in a test piping system and the valve is to be fully opened. The test piping system is to be equipped with a calibrated means by which selected rates of flow can be established. A differential gauge is to be connected to piezometer fittings located upstream and downstream from the test valve by means of which the head loss between the two piezometer fittings is to be measured. Flow velocities are to be established below, above, and at 15 feet per second (4.6 m/s) to derive a least-square, full logarithmic regression curve, from which the head loss at 15 feet per second is to be determined. 25.4 The sample valve then is to be removed from the test piping and the head loss for test piping located between the piezometer fittings is to be determined at a flow rate of 15 feet per second (4.6 m/s) in the same manner as described in 25.3. The head loss for the gate valve results from subtracting the loss through the piping alone from the loss through the piping and valve. 26 Mechanical Strength Test 26.1 A valve assembly shall withstand, without malfunction of any internal or external valve part which would affect the operability or strength of the valve, such as a handwheel, yoke, bonnet, stem assembly and seat seal, a torque applied at the handwheel or wrench nut as specified in Table 26.1 or 26.2, whichever is applicable. 26.2 The test torque is to be applied through the handwheel or wrench nut and measured from the center of the handwheel or wrench nut by a torque wrench or equivalent device. The torque value specified in Table 26.1 is to be applied to the sample valve: a) In the closed position in the direction tending to further close the valve; and


b) In the open position in the direction tending to further open the valve.


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FEBRUARY 26, 2004

Table 26.1 Torque values for outside-screw-and-yoke valves Outside-screw-and-yoke valve, handwheel diameter Inchesa

(mm)

Torque Foot-poundsb,c

(N·m)

2-5/8

(67)

15

(20.4)

3

(76)

25

(34)

3-1/4

(82)

32

(43.52)

3-1/2

(89)

41

(55.76)

4

(102)

60

(81.6)

4-3/8

(121)

70

(95.2)

5

(127)

90

(122.4)

6

(152)

125

(170)

7

(178)

160

(217.6)

8

(203)

190

(258.4)

10

(254)

260

(353.6)

11

(279)

290

(394.4)

12

(305)

325

(442)

13

(330)

375

(510)

14

(355)

450

(612)

15

(381)

540

(734.4)

16

(407)

640

(870.4)

17

(432)

760

(1033.6)

18

(457)

900

(1224)

a

1 inch = 25.4 mm

b

1 foot-pound = 1.36 N·m

c

Torque values for valves having handwheel diameters not specified herein are to be interpolated or extrapolated from the given values.

Table 26.2 Torque values for nonrising stem valves Nonrising stem valve size (nominal) inchesa 2-1/2 3 3-1/2 4 5 6 8 10 12 14 16 a

1 inch = 25.4 mm

b

1 foot-pound = 1.36 N·m

Torque

N G E (64) 125 (170) S H I (76) 160 (217.6) I M H (89) 190 (258.4) i S (102) 260 (353.6) h (127) 290 (394.4) , S T D e (152) 325 i c (442) L R (203) 450 O y C(510) B (254) 640 (870.4) M d C H (1033.6) A e (305) 760 8 a d N T E : (1224) 0 o (355) 900 l (407) 1040 U A 7 - 3(1414.4) w n o K D B y 0 0 s 2 a W U s e / 1 3 / t 8 e n F o r : m 9 u 3 c 0 D o 1E 2D M A T E R IA L – U L C O P Y R IG H T (mm)

Foot-poundsb

(N·m)



FEBRUARY 26, 2004


23

26.3 Following application of the torque, the valve is to be visually examined to determine that malfunction of parts, such as stripping of threads, cracking, shearing, and the like, has not occurred. Following this exposure, the valve is to be reseated, and shall comply with the Leakage Test, Section 24. 27 Hydrostatic Tests 27.1 An assembled valve shall withstand, without rupture, an internal hydrostatic pressure as specified in Table 27.1, applied for 1 minute. During this test, the valve is to be in the open position. Table 27.1 Hydrostatic test pressures Valve size (nominal) inches

(mm)

Multiple of rated pressure

1/2 – 6

(13 – 152)

5X

8 and larger

(203)

4X

27.2 If a valve was pneumatically tested for leakage as described in Leakage Test, Section 24, the hydrostatic test then is to be repeated on the valve with the gate closed and pressure applied to one side of the gate for 1 minute. For this test, the valve may include special provisions to prevent leakage past the seat. The test pressure is to be two times the rated working pressure. Following this exposure, the valve is to be opened and reseated, and there shall be no leakage, as demonstrated by the valve complying with the Leakage Test, Section 24. MANUFACTURING AND PRODUCTION TESTS 28 General 28.1 To verify compliance with these requirements in production, the manufacturer shall provide the necessary production control, inspection, and tests. 28.2 The program shall include at least factory testing each valve for body and seat leakage. The body leakage test is to be conducted hydrostatically at twice rated working pressure applied to all internal parts with the valve open and pressure exerted on both sides of the gate and maintained for a minimum of 15 seconds. There shall be no leakage through the body or permanent distortion. The seat leakage test is to be conducted hydrostatically at twice rated working pressure or pneumatically at rated working pressure. The pressure is to be applied between one end and the closed gate or, for double-disc gate valves, between the valve discs and maintained for a minimum of 15 seconds. If tested pneumatically, the valve seat is to be fully submerged in water. If tested hydrostatically, there shall be no leakage past a metal-to-metal gate seat in excess of 1 fluid ounce (29.6 ml) per hour per inch of nominal valve size. If tested pneumatically, there shall be no leakage past a metal-to-metal gate seat in excess of 0.1 cubic foot (2.83 dm3) of air [at one atmosphere 14.69 psi (101.3 kPa) pressure and 70°F (21.1°C)] per hour per inch of nominal valve size. There shall be no leakage past a gate with, or in contact with, a resilient seat.



24


FEBRUARY 26, 2004

MARKING 29 General 29.1 A gate valve shall be marked with the following: a) Manufacturer’s or private labeler’s name or identifying symbol; b) Nominal size of valve; c) Distinctive model number, catalog designation, or the equivalent; d) Rated pressure; and e) Year of manufacture. Valves produced in the last three months of a calendar year may be marked with the following year as the date of manufacture. Valves produced in the first six months of a calendar year may be marked with the previous year as the date of manufacture. 29.2 Except as specified in 29.4, the markings required by 29.1 (a) – (d) shall be included on the body or bonnet casting in the form of cast letters and figures at least 3/8 inch (9.5 mm) high for valves 4 inch size and smaller, and at least 1/2-inch (12.7-mm) high for valves larger than 4 inches, and raised at least 0.030 inch (0.76 mm) from the body or bonnet. 29.3 Except as specified in 29.4, the year of manufacture required by 29.1(e) shall be cast in letters in accordance with 29.2 or stamped on a flat space provided for the purpose using the letter height required in 29.2. 29.4 The markings required by 29.1 (a) – (e) can be cast in the valve body or bonnet in accordance with 29.2 or can be placed on an etched or stamped metal nameplate permanently mounted on the valve or bonnet using letters a minimum of 3/16-inch (4.8-mm) high and 0.005-inch (0.13-mm) deep. 29.5 If a manufacturer produces valves at more than one factory, each valve shall have a distinctive marking to identify it as the product of a particular factory.



GATE VALVES FOR FIRE - PROTECTION SERVICE

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