Gate Valves for Fire-Protection Service

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UL COPYRIGHTED MATERIAL –NOT AUTHORIZED FOR FURTHER REPRODUCTION OR

DISTRIBUTION WITHOUT PERMISSION FROM UL

UL 262

Gate Valves for Fire-ProtectionService

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UL Standard for Safety for Gate Valves for Fire-Protection Service, UL 262

Eighth Edition, Dated February 26, 2004

Summary of Topics

This revision of UL 262 is being issued to correct a typographic error.

Text that has been changed in any manner or impacted by UL’s electronic publishing system is markedwith a vertical line in the margin. Changes in requirements are marked with a vertical line in the marginand are followed by an effective date note indicating the date of publication or the date on which thechanged requirement becomes effective.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwisewithout prior permission of UL.

UL provides this Standard ″as is″ without warranty of any kind, either expressed or implied, including butnot limited to, the implied warranties of merchantability or fitness for any purpose.

In no event will UL be liable for any special, incidental, consequential, indirect or similar damages,including loss of profits, lost savings, loss of data, or any other damages arising out of the use of or theinability to use this Standard, even if UL or an authorized UL representative has been advised of thepossibility of such damage. In no event shall UL’s liability for any damage ever exceed the price paid forthis Standard, regardless of the form of the claim.

Users of the electronic versions of UL’s Standards for Safety agree to defend, indemnify, and hold ULharmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonableattorney’s fees) resulting from any error or deviation introduced while purchaser is storing an electronicStandard on the purchaser’s computer system.

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 theaffected item. The prior text for requirements that have been revised and that have a future effective dateare located after the Standard, and are preceded by a ″SUPERSEDED REQUIREMENTS″ notice.

OCTOBER 21, 2011 − UL 262 tr1

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OCTOBER 21, 2011 − UL 262tr2

No Text on This Page

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February 26, 2004(Title Page Reprinted: October 21, 2011)

1

UL 262

Standard for Gate Valves for Fire-Protection Service

The first edition was covered by two standards titled Outside Screw and YokeGate Valves and Inside Screw Valves for Underground Work, numbered UL 262Band UL 262A, respectively.

The second edition was titled Outside Screw and Yoke Gate Valves andnumbered UL 262B.

First Edition – March, 1931Second Edition – August, 1950

Third Edition – June, 1966Fourth Edition – May, 1973Fifth Edition – April, 1980

Sixth Edition – November, 1988Seventh Edition – May, 1994

Eighth Edition

February 26, 2004

This UL Standard for Safety consists of the Eighth Edition including revisionsthrough October 21, 2011.

The Department of Defense (DoD) has adopted UL 262 on August 10, 1989 . Thepublication of revised pages or a new edition of this Standard will not invalidatethe DoD adoption.

Comments or proposals for revisions on any part of the Standard may besubmitted to UL at any time. Proposals should be submitted via a ProposalRequest in UL’s On-Line Collaborative Standards Development System (CSDS)at http://csds.ul.com.

UL’s Standards for Safety are copyrighted by UL. Neither a printed nor electroniccopy of a Standard should be altered in any way. All of UL’s Standards and allcopyrights, ownerships, and rights regarding those Standards shall remain thesole and exclusive property of UL.

COPYRIGHT © 2011 UNDERWRITERS LABORATORIES INC.

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JUNE 5, 2008GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 2622


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CONTENTS

INTRODUCTION

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73 Units of Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84 Undated References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

CONSTRUCTION

5 Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86 Rated Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87 Bodies and Bonnets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88 Valve Operation Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109 Gates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1010 Seating Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1011 Stems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1012 Stuffing Boxes and Stem Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1113 Handwheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1114 Wrench Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1315 Indicator Post Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

PERFORMANCE

16 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1517 Metallic Materials Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1518 10-Day Moist Ammonia Air Stress Cracking Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1519 Elastomeric Parts (Except Gaskets) Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1620 Tests on Organic Coating Materials for Seating Surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

20.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1620.2 Air oven exposure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1720.3 Water immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1720.4 Sodium chloride immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1820.5 Potassium biphthalate immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1820.6 Sodium carbonate immersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1820.7 Impact test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

21 Resilient Seat Material Securement Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1922 Resilient Seat Cycling Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1923 Stuffing Box Repacking Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2024 Leakage Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2025 Friction Loss Test for Valves Having Reduced Waterways . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2126 Mechanical Strength Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2127 Hydrostatic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

MANUFACTURING AND PRODUCTION TESTS

28 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

JUNE 5, 2008 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 3

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MARKING

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

FEBRUARY 26, 2004GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 2624

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FEBRUARY 26, 2004 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 5


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INTRODUCTION

1 Scope

1.1 These requirements cover gate valves intended for installation in piping systems supplying water forfire-protection service. Gate valves covered by these requirements are of the outside-screw-and-yoke typeor 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 accordancewith 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 therequirements for that component.

2.2 A component is not required to comply with a specific requirement that:

a) Involves a feature or characteristic not required in the application of the component in theproduct covered by this standard, or

b) Is superseded by a requirement in this standard.

2.3 A component shall be used in accordance with its rating established for the intended conditions ofuse.

2.4 Specific components are incomplete in construction features or restricted in performance capabilities.Such components are intended for use only under limited conditions, such as certain temperatures notexceeding specified limits, and shall be used only under those specific conditions.


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3 Units of Measurement

3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.

4 Undated References

4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted 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 oftrade size 1/2 inch or larger. A gate valve of the nonrising stem type shall be constructed for use withstandard 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 andto 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 threadstapped 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

7.1 The body of a valve shall be of the straightway type and shall provide, when the gate is fully open, awaterway diameter equal to or greater than the inside diameter of a mating pipe. The diametermeasurement is to be made at points away from projecting lugs used for the seat ring assembly.

Exception: A gate valve providing a waterway having a diameter less than the diameter of the matingpipe is acceptable, if the valve incorporating such a waterway complies with the requirements of theFriction Loss Test for Valves Having Reduced Waterways, Section 25.

7.2 The body and bonnet of a valve shall be made of materials having strength, rigidity, and resistanceto corrosion at least equivalent to cast iron or bronze.

7.3 A casting shall be smooth and free from scale, lumps, cracks, blisters, sand holes, and defects of anynature that make it unfit for the intended use. A casting shall not be plugged or filled, but may beimpregnated to remove porosity.


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7.4 Guides shall be cast integrally with the body. If the gate can be assembled in other than the intendedmanner, the guides shall be of unequal width, or other equivalent means shall be provided to facilitatecorrect assembly.

7.5 The dimensions of all flanges, flange pipe joints, grooves, and threaded body openings shall conformto the following standards, as applicable:

a) Fittings, 3 – 48 inches, (76.2 – 1219 mm) for Water and Other Liquids, Gray Iron and DuctileIron, 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/ASMEB16.1.

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); PipeFlanges 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 theinternal parts.

7.7 An outside-screw-and-yoke valve shall be constructed so that the hand cannot be jammed betweena yoke and the handwheel.

7.8 The load on any bolt, exclusive of the force required to compress the gasket, shall not exceed theminimum tensile strength specified in Table 2 of the Standard Specification for Carbon Steel Bolts andStuds, 60,000 psi Tensile Strength, ASTM A307, when the valve is pressurized at the test pressurespecified in 27.1. The area of the application of pressure is to be calculated as follows:

a) If a full-face gasket is used, the area of force application is that extending out to a linedefined by the inner edge of the bolts.

b) If an ″O″ ring seal or ring gasket is used, the area of force application is that extending outof the center line of the ″O″ ring or gasket.

7.8 revised October 21, 2011

OCTOBER 21, 2011 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 9

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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 unlessthe 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 corrosionresistance.

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 ofthe 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 shallbe 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 forSeating Surfaces, Section 20.

11 Stems

11.1 A stem shall be made of material having strength and resistance to corrosion at least equivalent tobronze.

11.2 Stem threads shall be Acme, modified Acme, half ″V,″ or square.

11.3 The connection between a stem and its gate shall be aligned so that the stem is not bound whenthe gate is seated.

11.4 A stem nut shall be of material having strength, wear resistance, and corrosion resistance at leastequivalent to bronze.

11.5 The stem of a nonrising stem valve shall, when the valve is closed, enter the stem nut a distanceequal to at least 1-1/4 (31.75 mm) times the outside diameter of the stem.


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11.6 A 5-inch (127-mm) or larger outside-screw-and-yoke valve shall be provided with a bronze washerbetween the yoke and the handwheel, unless the construction of the stem nut does not permit the yokeand 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 asquare-tapered end or pinning the nut to the stem. If the stem is not provided with a square taper, themeans of attachment shall be constructed of material having corrosion resistance at least equivalent tobrass, 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 followergland retained by bolts or studs. Bolts or studs employed for retaining a gland for a stuffing box may beof bronze, iron, or steel, but shall in all cases engage nuts or other threaded sections of bronze or otherequivalent corrosion resistant material.

12.3 The width of the annular recess in a stuffing box between the stem and the inner wall shall be notless 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. Thebolts and nuts for o-ring type stem seals shall be made of stainless steel, bronze, iron, steel, or othermaterial.

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″ atthe feather end or in a break in the shaft, shall be cast on the handwheel and be easily readable. SeeFigure 13.1.

This is generated text for figtxt.


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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) sizeand smaller; 2-1/2-inches (64-mm) long for a valve of 3, 4, and 5 inch (76, 102, and 127 mm) size; and 4inches (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 theunbroken arrow.

13.4 The outside diameter of a handwheel shall be not less than the sizes specified in Table 13.1.

Table 13.1Minimum handwheel diameters

Nominal valve size Diameter of handwheel

Inches (mm) Inches (mm)

1/2, 3/4 (12.7, 19) 2-5/8 (67)

1 (25.4) 2-5/8 (67)

1-1/4 (32) 3 (76)

1-1/2 (38.1) 3-1/4 (83)

2 (51) 3-1/2 (89)

2-1/2 (64) 4-3/8 (121)

3 (76) 6 (152)

3-1/2 (89) 7 (178)

4 (102) 8 (203)

5 (127) 10 (254)

6 (152) 11 (279)

8 (203) 13 (330)

Figure 13.1Handwheel detail


Table 13.1 Continued on Next Page

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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 resistanceto corrosion at least equivalent to cast iron. It shall be fitted to the end of the stem and shall be securedby 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 atthe base of a section 1-3/4-inches (45-mm) high. The nut shall include a flanged base upon which shallbe 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.


Figure 14.1Wrench nut


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15 Indicator Post Flanges

15.1 A nonrising stem type valve intended for connection to an indicator post shall have a flange cast onthe bonnet for attaching an indicator post to the valve, or have an intermediate annular flange of standarddimensions 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 havethe major dimensions and bolt-hole locations as shown in Figure 15.1. The flange shall be of materialhaving the strength, rigidity, and resistance to corrosion equivalent to 5/8 inch (15.9 mm) thick cast ironand shall be drilled for four 5/8 inch (15.9 mm) bolts.


15.3 The flange intended for connection to an indicator post shall be provided with at least two holes,each having a minimum area of 0.19 square inches (127 mm2 ), for drainage of the indicator post. Thedrain holes may be constructed to allow plugging if a watertight construction is required for specific fieldinstallations.

Figure 15.1Indicator post flange


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PERFORMANCE

16 General

16.1 Representative samples of each size gate valve shall be subjected to the tests described in theserequirements. Test bars of metal used in castings and additional samples of parts constructed ofnonmetallic 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 makingthe bodies and bonnets of valve samples submitted for investigation and test. The specimen bars shallconform to the minimum physical property requirements of the latest edition of the applicable ASTM ornationally 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 than15 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 asthe result of assembly with other components. Such stresses are to be applied to the sample prior to andmaintained 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 pipecompound are not to be used on the treads.

Table 18.1Torque requirements for threaded connections

Nominal thread size Torque

Inches (mm) Pound-inches (N·m)

1 (25.4) 1200 (135.6)

1-1/4 (32) 1450 (163.8)

1-1/2 (38) 1550 (175.1)

2 (51) 1650 (186.4)

2-1/2 (64) 1750 (197.7)

3 (76) 1800 (203.4)

18.3 Three samples are to be degreased and then continuously exposed in a set position for ten days toa moist ammonia-air mixture maintained in a glass chamber approximately 12 by 12 by 12 inches (305 by305 by 305 mm) having a glass cover.


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18.4 Approximately 600 ml of aqueous ammonia having a specific gravity of 0.94 is to be maintained atthe bottom of the glass chamber below the samples. The samples are to be positioned 1-1/2 inches (38.1mm) above the aqueous ammonia solution and supported by an inert tray. The moist ammonia-air mixturein 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 asspecified in the Standard for Gaskets and Seals, UL 157:

a) For silicone rubber (having poly-organo-siloxane as its constituent characteristic), a minimumtensile 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 tensilestrength of 1500 psi (10.3 MPa) and minimum ultimate elongation of 150 percent; or a minimumtensile 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 elongationafter oven aging; and hardness after oven aging, all as specified in UL 157. The maximumservice temperature used to determine the oven time and temperature for oven aging isconsidered to be 60°C (140°F).

19.2 The Standard for Gaskets and Seals, UL 157, provides for the testing of either finished elastomericparts or sheet or slab material. Sheet or slab material is to be tested when the elastomeric parts areO-rings having diameters of less than 1 inch (25.4 mm). The material tested is to be the same as that usedin 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 orblistering when tested as specified in 20.2 – 20.6, shall show no evidence of base metal corrosion outsidethe scribed area when tested as specified in 20.3, and shall show no signs of cracking when tested asspecified in 20.7.1. For these purposes, ″cracking″ does not include surface crazing.


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20.2 Air oven exposure

20.2.1 Four specimens of combined coating material/base material, each measuring 4 by 4 inches (102by 102 mm), are to be used for this test. The thickness of the coating material and base material are tobe equivalent to the thickness used in valve construction. The specimens are to be prepared in a mannerthat 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 ±1°C (212 ±2°F), or at thetemperature determined in 20.2.4, as appropriate, for 180 days.

20.2.3 Following the exposure, the test specimens are to be visually examined for any evidence ofdisbondment or blistering of the coating.

20.2.4 If a coating material does not withstand the temperature specified in 20.2.2 without excessivedeterioration, an air-oven aging test at a lower temperature for a longer period of time is to be applied. Ifa coating material is capable of withstanding a higher temperature than that specified in 20.2.2 withoutexcessive deterioration, an air-oven aging test at a higher temperature for a shorter period of time, but notless than 30 days, is to be applied. The duration of exposure is to be calculated from the followingequation:

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


20.3.2 On each specimen an ″X ″ is to be scribed with a sharp instrument through the coating materialto the base material surface with each scribe 3 ±0.25 inch (76 ±6 mm) long. The scribed test specimensthen are to be immersed in distilled water at a temperature of 70 ±1°C (158 ±2°F) for 90 days.

20.3.3 Following the exposure, the test specimens are to be visually examined for any evidence ofdisbondment or blistering of the coating or any corrosion of base metal outside of the scribed areas.


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20.4 Sodium chloride immersion


20.4.2 The test specimens are to be immersed in sodium chloride solution (2 percent by weight) at atemperature of 70 ±1°C (158 ±2°F) for 90 days.


20.5 Potassium biphthalate immersion


20.5.2 The test specimens are to be immersed in potassium biphthalate solution (pH=4) at a temperatureof 70 ±1°C (158 ±2°F) for 90 days.


20.6 Sodium carbonate immersion


20.6.2 The test specimens are to be immersed in sodium carbonate solution (pH=10) at a temperature of70 ±1°C (158 ±2°F) for 90 days.



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20.7 Impact test

20.7.1 Three specimens of combined coating material/base material as described in 20.2.1, or threesamples of the actual part from the valve, are to be tested. The impact apparatus described in theStandard 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 0.625 inch (15.9 mm) diameter hemispherical head. Following the impact the specimensare to be visually examined, without magnification, for any evidence of coating cracking. If a crack isdetected visually, without the aid of magnification, a Holiday test is to be performed to ascertain whetherthe crack propagates to the substrate. NACE Standard RP0188 Discontinuity (Holiday) Testing of NewProtective Coatings on Conductive Substrates is to be used for this test.

20.7.1 revised October 11, 2011

21 Resilient Seat Material Securement Test

21.1 Resilient seat material of a gate valve shall withstand without separation, tearing, or permanentdistortion the waterflow described in 21.2.

21.2 A representative size valve, in the approximately half open position, is to be subjected to a waterflowvelocity of 15 feet per second (4.6 m/s) for 1 hour. Following the waterflow, the valve is to be visuallyexamined 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 inSchedule 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 operationper minute, and in all instances the cycles are to be at a rate less than that at which water hammerdamage could occur. A cycle of operation is to consist of valve operation from the fully-closed to thefully-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 closedposition.

OCTOBER 11, 2011 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 19

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23 Stuffing Box Repacking Test

23.1 A valve shall permit repacking of the stuffing box or replacement of at least one seal ring when thevalve is wide open and at rated pressure.

23.2 The valve is to be connected to a hydrostatic pressure source and be wide open at rated pressure.The valve is then to be repacked and one seal ring replaced, in order to determine compliance with therequirements in 23.1.

24 Leakage Test

24.1 A metal-to-metal seated gate valve shall withstand, without leakage at joints, an internal hydrostaticpressure of two times the rated pressure of the valve applied for 1 minute. The valve seat, stuffing box orstem seal shall not leak at a rate exceeding 1 fluid ounce (29.6 ml) per hour per inch of nominal valvesize at two times the rated pressure of the valve applied for 1 minute.

24.1 revised June 5, 2008

24.1.1 A resilient seated gate valve shall withstand, without leakage at joints, at the seat, or at the stuffingbox or seal provided for the stem, an internal hydrostatic pressure of 1-1/2 times the rated pressure of thevalve applied for 1 minute.

24.1.1 added June 5, 2008

24.2 The torque values specified in Table 24.1 are the maximum values to be used to close a valve forthe tests described in 24.1 and 24.1.1.


Table 24.1Maximum valve closing torque values

Nominal valve size Torque

Inches a (mm) Foot-pounds b (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)

a1 inch = 25.4 mmb1 foot-pound = 1.36 N·m

24.3 For a double-disc gate valve, the hydrostatic pressure is to be applied between the valve discs. Fora solid-wedge gate valve, the hydrostatic pressure is to be applied between one end and the closed gate,the opposite end and the closed gate, and finally, in the bonnet with the gate opened.


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JUNE 5, 2008 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 20A

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JUNE 5, 2008GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 26220B


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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 pipeshall demonstrate a head loss not exceeding 0.5 psi (3.4 kPa) at a flow rate of 15 feet per second (4.6m/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 inSchedule 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 valveis to be fully opened. The test piping system is to be equipped with a calibrated means by which selectedrates of flow can be established. A differential gauge is to be connected to piezometer fittings locatedupstream and downstream from the test valve by means of which the head loss between the twopiezometer fittings is to be measured. Flow velocities are to be established below, above, and at 15 feetper second (4.6 m/s) to derive a least-square, full logarithmic regression curve, from which the head lossat 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 locatedbetween the piezometer fittings is to be determined at a flow rate of 15 feet per second (4.6 m/s) in thesame manner as described in 25.3. The head loss for the gate valve results from subtracting the lossthrough 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 whichwould affect the operability or strength of the valve, such as a handwheel, yoke, bonnet, stem assemblyand 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 centerof the handwheel or wrench nut by a torque wrench or equivalent device. The torque value specified inTable 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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Table 26.1Torque values for outside-screw-and-yoke valves

Outside-screw-and-yoke valve, handwheel diameter Torque

Inches a (mm) Foot-pounds b,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 mmb 1 foot-pound = 1.36 N·mc Torque values for valves having handwheel diameters not specified herein are to be interpolated or extrapolated from thegiven values.

Table 26.2Torque values for nonrising stem valves

Nonrising stem valve size Torque

(nominal) inches a (mm) Foot-pounds b (N·m)

2-1/2 (64) 125 (170)

3 (76) 160 (217.6)

3-1/2 (89) 190 (258.4)

4 (102) 260 (353.6)

5 (127) 290 (394.4)

6 (152) 325 (442)

8 (203) 450 (510)

10 (254) 640 (870.4)

12 (305) 760 (1033.6)

14 (355) 900 (1224)

16 (407) 1040 (1414.4)

a 1 inch = 25.4 mmb 1 foot-pound = 1.36 N·m


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26.3 Following application of the torque, the valve is to be visually examined to determine thatmalfunction 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 of 4 times therated pressure applied for 5 minutes. During this test, the valve is to be in the open position.


Table 27.1 deleted June 5, 2008

27.2 For resilient seated valves the hydrostatic test is to be repeated on the valve with the gate closedand pressure applied to one side of the gate for 1 minute. For this test, leakage at the seat shall bepermitted. The test pressure is to be two times the rated working pressure. Following this exposure, thevalve is to be opened and reseated, and there shall be no leakage, as demonstrated by the valvecomplying 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 thenecessary production control, inspection, and tests.

28.2 The program shall include at least factory testing each valve for body and seat leakage. The bodyleakage test is to be conducted hydrostatically at twice rated working pressure applied to all internal partswith the valve open and pressure exerted on both sides of the gate and maintained for a minimum of 15seconds. There shall be no leakage through the body or permanent distortion. The seat leakage test is tobe conducted hydrostatically at 1-1/2 times rated working pressure or pneumatically at rated workingpressure. The pressure is to be applied between one end and the closed gate or, for double-disc gatevalves, between the valve discs and maintained for a minimum of 15 seconds. 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 perinch of nominal valve size. If tested pneumatically, there shall be no leakage past a metal-to-metal gateseat in excess of 0.1 cubic foot (2.83 dm3) of air [at one atmosphere 14.69 psi (101.3 kPa) pressure and70°F (21.1°C)] per hour per inch of nominal valve size. There shall be no leakage past a gate with, or incontact with, a resilient seat.


JUNE 5, 2008 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 23

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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 bemarked with the following year as the date of manufacture. Valves produced in the first sixmonths 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 bodyor bonnet casting in the form of cast letters and figures at least 3/8 inch (9.5 mm) high for valves 4 inchsize and smaller, and at least 1/2-inch (12.7-mm) high for valves larger than 4 inches, and raised at least0.030 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 inaccordance with 29.2 or stamped on a flat space provided for the purpose using the letter height requiredin 29.2.

29.4 The markings required by 29.1 (a) – (e) can be cast in the valve body or bonnet in accordance with29.2 or can be placed on an etched or stamped metal nameplate permanently mounted on the valve orbonnet 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 distinctivemarking to identify it as the product of a particular factory.


Documents

Gate Valves for Fire-Protection Service