1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 262 Gate Valves for Fire-Protection ServiceUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FO
2、R FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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: Revise Markings in 29.2 and 29.5; Add Alternate Stem Mate
3、rials in Revised 11.1, New 11.1.1, and New Section 20A; Revise 7.5 to Allow for Alternate End Connections. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new and revised requirements are substantially in acco
4、rdance with Proposal(s) on this subject dated August 26, 2015, September 16, 2015, and September 23, 2015. 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 oth
5、erwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential
6、, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability
7、for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasona
8、ble attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. NOVEMBER 5, 2015 UL 262 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 5,
9、2015 UL 262 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL February 26, 2004 (Title Page Reprinted: November 5, 2015) 1 UL 262 Standard for Gate Valves for Fire-Protection Service The rst edition was covered by two s
10、tandards 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
11、, 1966 Fourth Edition May, 1973 Fifth Edition April, 1980 Sixth Edition November, 1988 Seventh Edition May, 1994 Eighth Edition February 26, 2004 This UL Standard for Safety consists of the Eighth Edition including revisions through November 5, 2015. The Department of Defense (DoD) has adopted UL 26
12、2 on August 10, 1989. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Colla
13、borative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole an
14、d exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 5, 2015 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTH
15、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 Components 7 3 Units of Measurement .8 4 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 .
16、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 General 15 17 Metallic Materials Test .15 18 10-Day Moist Ammonia Air Stress Cracking Test .15 19 Elastomeric Parts (Except Gaskets) Test 16 20 Tests on Organic Coati
17、ng 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 20A Comparative Corrosion Tests for Stems 19 20A.1 General 19 20A
18、.2 Moist carbon dioxide-sulfur dioxide air mixture 19 20A.3 Salt spray 20 21 Resilient Seat Material Securement Test 20 22 Resilient Seat Cycling Test 20 23 Stuffing Box Repacking Test .20 24 Leakage Test .20A 25 Friction Loss Test for Valves Having Reduced Waterways .21 26 Mechanical Strength Test
19、21 27 Hydrostatic Tests .23 MANUFACTURING AND PRODUCTION TESTS 28 General 23 NOVEMBER 5, 2015 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARKING 29 General 24 FEBRUARY 26, 2004 GATE VALV
20、ES FOR FIRE-PROTECTION SERVICE - UL 262 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 26, 2004 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 5 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION
21、 OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 5, 2008 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover gate valves intended for installatio
22、n in piping systems supplying water for re-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
23、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
24、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 s
25、tandard shall comply with the requirements for that component. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirem
26、ent in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited condition
27、s, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. FEBRUARY 26, 2004 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units o
28、f 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 late
29、st 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
30、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 m
31、etal 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 st
32、raightway 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. Exception: A gate valve providing a waterway h
33、aving a diameter less than the diameter of the mating pipe is acceptable, if the valve incorporating such a waterway complies with the requirements of the Friction 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
34、, rigidity, and resistance to 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 any nature that make it unt for the intended use. A casting shall not be plugged or lled, but may be impregnated
35、to remove porosity. FEBRUARY 26, 2004 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.4 Guides shall be cast integrally with the body. If the gate can be assembled in other than the intende
36、d 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 anges, ange pipe joints, grooves, and threaded body openings shall conform to the following standards, as applicable or to other national standards th
37、at apply where the valve is intended to be installed: a) Fittings,34 8inches, (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 Fl
38、anges 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 (12
39、06 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 par
40、ts. 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 specied in Table 2 of the Standard Specicat
41、ion for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength, ASTM A307, when the valve is pressurized at the test pressure specied 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
42、out to a line dened 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 out of the center line of the O ring or gasket. NOVEMBER 5, 2015 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED F
43、OR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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 ange (see Secti
44、on 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 eld 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
45、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
46、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 sur
47、face 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 11.1 A stem shall be made of
48、 material having strength and resistance to corrosion at least equivalent to bronze or Series 300 stainless steel. 11.1.1 Other materials are permitted to be used when evaluated for strength at least equivalent to bronze and evaluated for corrosion resistance as specied in the Comparative Corrosion
49、Test, Section 20A. 11.2 Stem threads shall be Acme, modied 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 when the gate is seated. 11.4 A stem nut shall be of material having strength, wear resistance, and corrosion resistance at least equivalent to bronze. NOVEMBER 5, 2015 GATE VALVES FOR FIRE-PROTECTION SERVICE - UL 262 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERM
