1、ANSI/AWWA C500-09(Revision of ANSI/AWWA C500-02)AW WA StandardEffective date: Oct. 1, 2009.First edition approved by AWWA Board of Directors Jan 30, 1984.This edition approved Jan. 25, 2009.Approved by American National Standards Institute Aug. 13, 2009.6666 West Quincy Avenue Advocacy Denver, CO 80
2、235-3098 Communications T 800.926.7337 Conferences www.awwa.org Education and TrainingScience and TechnologySectionsSMThe Authoritative Resource on Safe WaterMetal-Seated Gate Valves for Water Supply Servicec500-09.indd i 8/31/2009 11:47:52 AMiiAWWA StandardThis document is an American Water Works A
3、ssociation (AWWA) standard. It is not a specifi cation. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifi -cations. The AWWA standards usually contain options that must be evaluated by the user of the s
4、tandard. Until each optional feature is specifi ed by the user, the product or service is not fully defi ned. AWWA publication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certify, or approve any product. The use of AWWA standards is entirely volu
5、ntary. This standard does not supersede or take precedence over or displace any applicable law, regulation, or codes of any governmental authority. AWWA standards are intended to represent a consensus of the water supply industry that the product described will provide satisfactory service. When AWW
6、A revises or withdraws this standard, an offi cial notice of action will be placed on the fi rst page of the classifi ed advertising section of Journal AWWA. The action becomes effective on the fi rst day of the month following the month of Journal AWWA publication of the offi cial notice.American N
7、ational StandardAn American National Standard implies a consensus of those substantially concerned with its scope and provisions. An Ameri-can National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does n
8、ot in any respect preclude anyone, whether that person has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic review, and users are cautioned to obtai
9、n the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility in advertis-ing and promotional materials or on tags or labels that the goods are produced in conformity with particular American National Standards. CA
10、UTION NOTICE: The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn at any time. ANSI procedures require that action be taken to reaffi rm, revi
11、se, or withdraw this standard no later than fi ve years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036; (21
12、2) 642-4900.All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information or retrieval system, except in the form of brief excerpts or quotations for review purposes, without
13、 the written permission of the publisher.Copyright 2009 by American Water Works AssociationPrinted in USAc500-09.indd Sec1:ii 8/31/2009 11:48:01 AMiiiCommittee PersonnelTh e AWWA Standards Committee on Gate Valves and Swing Check Valves, which reviewed and approved this standard, had the following p
14、ersonnel at the time of approval:Joseph J. Gemin, Co-ChairRobert L. Gardner, Co-ChairGeneral Interest MembersJ.M. Assouline,*CH2M HILL, Englewood, Colo. (AWWA)M.D. Bennett, Mentor, Ohio (AWWA)R.L. Claudy Jr., Orlando Utilities Commission, Orlando, Fla. (AWWA)K.G. Clegg, CH2M HILL, Corvallis, Ore. (A
15、WWA)D. Die enbach, Malcolm Pirnie Inc., Phoenix, Ariz. (AWWA)J.J. Gemin, Earth Tech (Canada) Inc., Kitchener, Ont. (AWWA)M.C. Johnson, Utah State University, Water Research Laboratory, Logan, Utah (AWWA)G.E. Laverick, Underwriters Laboratories Inc., Northbrook, Ill. (UL)T.J. McCandless,Standards Eng
16、ineer Liaison, AWWA, Denver, Colo. (AWWA)P.I. McGrath Jr., Birmingham, Ala. (AWWA)T.R. Volz, URS Corporation, Denver, Colo. (AWWA)M.P. Yoke, Anniston, Ala. (AWWA)Producer MembersJ.V. Ballun, Val-Matic Valve Flax or Hemp.MSSSP-9Spot Facing for Bronze, Iron, and Steel Flanges.MSSSP-60Connecting Flange
17、 Joint Between Tapping Sleeves and Tap-ping Valves.SAE AS-568Aerospace Size Standard for O-rings.SECTION 3: DEFINITIONSIn this standard, the following defi nitions shall apply:1. Antiseize compound: A compound that enables nondestructive assembly and disassembly of threaded components.2. Cosmetic de
18、fect: A blemish that has no e ect on the ability of a component to meet the structural design and production test requirements of this standard. If the blemish or the activity of plugging, welding, grinding, or repairing the blemish causes the component to fail these requirements, the blemish shall
19、be considered a structural defect.* Federal Specifi cation available from Naval Publications and Forms Center, 5801 Tabor Ave., Philadelphia, PA 19120. Manufacturers Standardization Society of the Valve and Fittings Industry Inc., 127 Park Street N.E., Vienna, VA 22180. Aerospace Standard available
20、from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096.c500-09.indd 4 8/31/2009 11:48:02 AMMETAL-SEATED GATE VALVES FOR WATER SUPPLY SERVICE 53. Flanged joint: Th e fl anged and bolted joint as detailed in ANSI/ AWWA C110/A21.10 or ASME B16.1, class 125, or Sec. 4.4.3.2 of this standar
21、d.4. Hub-end (bell-and-spigot) joint: Th e poured or caulked joint as described in Sec. 4.4.3.1.5. Manufacturer: Th e party that manufactures, fabricates, or pro-duces materials or products.6. Mechanical joint: Th e gasketed and bolted joint as described in ANSI/ AWWA C111/A21.11.7. NPS: Nominal pip
22、e size.8. Purchaser: Th e person, company, or organization that purchases any materials or work to be performed.9. Push-on joint: Th e single rubber gasket joint as described in ANSI/ AWWA C111/A21.11.10. Structural defect: A fl aw that causes a component to fail the struc-tural design or test requi
23、rements of this standard. Th is includes, but is not limited to, imperfections that result in leakage through the walls of a casting, failure to meet minimum wall thickness requirement, or failure to meet production tests.11. Supplier: Th e party that supplies materials or services. A supplier may o
24、r may not be the manufacturer.12. Tapping valves: A special gate valve designed with end connec-tions and an unobstructed waterway to provide proper alignment and positioning of a tapping sleeve, valve, and machine for tapping pipe dry or under pressure.SECTION 4: REQUIREMENTSSec. 4.1 Data to Be Sup
25、pliedIf requested by the purchaser, the manufacturer or supplier shall provide the following information when supplying metal-seated gate valves.4.1.1 Catalog data. Th e manufacturer shall supply catalog data, includ-ing illustrations and a parts list that identifi es the materials used for various
26、parts. Th e information shall be in su cient detail to serve as a guide in the assembly and disassembly of the valve and for ordering repair parts.4.1.2 Weight information. Th e manufacturer shall provide a statement of the net assembled weight for each size of valve exclusive of joint accessories.c
27、500-09.indd 5 8/31/2009 11:48:02 AM6 AWWA C500-094.1.3 Assembly drawings. Th e manufacturer shall submit to the purchaser one set of drawings showing the principal dimensions, construction details, and materials used for all parts of the valve. Work shall be done and valves shall be provided in acco
28、rdance with these drawings after the drawings have been reviewed and accepted by the purchaser.Sec. 4.2 Materials4.2.1 General. Materials shall comply with the requirements of the Safe Drinking Water Act and other federal requirements. Materials used in valves pro-duced according to this standard sh
29、all conform to the requirements stipulated in the following sections.4.2.2 Permeation. Th e selection of materials is critical for water service and distribution piping in locations where there is likelihood the pipe will be exposed to signifi cant concentrations of pollutants consisting of low-mole
30、cular-weight petro-leum products or organic solvents or their vapors. Research has documented that pipe materials such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement and elastomers, such as those used in jointing gaskets and packing glands, are subject to permeation by lower-
31、molecular-weight organic solvents or petroleum products. If a water pipe must pass through such a contaminated area or an area subject to contamination, consult with the manufacturer regarding permeation of pipe walls, jointing materials, etc., before selecting materials for use in that area.4.2.3 D
32、issimilar metals. In the presence of an electrolyte, direct contact between metals of dissimilar corrosion resistance may result in galvanic corrosion of the more active, less corrosion-resistant material. When dissimilar metals must be used for internal parts, the rate of corrosion shall be reduced
33、 as much as practi-cal through the selection of materials that exhibit similar resistance to corrosion, by placing a dielectric material between the metals, or by applying a dielectric coating. When contact between dissimilar metals cannot be avoided, the assembly shall be designed so that the resul
34、ting corrosion will be minimized and will not adversely a ect water quality or result in malfunctioning or premature failure of the assembly.4.2.4 Mechanical and chemical properties. Th e requirements of ASME, ASTM, AWWA, or other standards to which references are made in this text shall govern the
35、mechanical and chemical characteristics of the valve components. Whenever valve components are made in conformance with AWWA, ASME, ASTM, or other standards that include test requirements or testing procedures, the manufacturer or supplier shall comply with these requirements or procedures. c500-09.
36、indd 6 8/31/2009 11:48:02 AMMETAL-SEATED GATE VALVES FOR WATER SUPPLY SERVICE 7Th e records of all tests shall, if required by the purchasers documents, be made available to the purchaser.4.2.4.1 Gray iron. Gray iron shall equal or exceed the requirement of ASTM A126 class B.4.2.4.2 Ductile iron. Du
37、ctile iron shall conform to one of the following standards: ASTM A395 or ASTM A536.4.2.4.3 Copper alloys. Copper alloys used in valves shall comply with the following:4.2.4.3.1 Copper-alloy valve components shall be made to ASTM-recog-nized alloy specifi cations with Unifi ed Numbering System for Me
38、tals and Alloys (UNS) designations. Copper alloys are not limited to those specifi ed in this stan-dard. Copper alloys, however, must meet the performance requirements of this standard, including, but not limited to, minimum yield strength, chemical require-ments, and corrosion resistance.4.2.4.3.2
39、Any copper alloy used in the cold-worked condition shall be capable of passing the mercurous nitrate test in accordance with ASTM B154 to minimize susceptibility to stress corrosion.4.2.4.3.3 Waters in some areas have promoted corrosion in the form of dezincifi cation or dealuminization of copper al
40、loy. Th e manufacturer should be notifi ed if this condition exists. Copper alloys that contain more than 16 percent zinc shall not be used in such waters. If aluminum bronze is used, the alloys shall be inhibited against dealuminization.4.2.4.3.4 Copper alloys that contain more than 16 percent zinc
41、 shall not contain less than 57 percent copper.4.2.4.3.5 Copper alloys that contain 16 percent or less zinc shall not con-tain less than 79 percent copper.4.2.4.3.6 Valve components manufactured from some grades of manga-nese, bronze, or some other materials are subject to stress corrosion. Th e man
42、ufac-turer shall design the valve and select materials to minimize stress corrosion.4.2.4.4 Carbon steel. Carbon-steel castings shall conform to the require-ments of ASTM A27 grade U60-30 or equal.4.2.4.5 Stainless steel. Stainless steel used in valves shall comply with the following:4.2.4.5.1 Stain
43、less-steel components shall conform to the requirements of ASTM A276, ASTM A473, ASTM A582, or ASTM A743/A743M.c500-09.indd 7 8/31/2009 11:48:02 AM8 AWWA C500-094.2.4.5.2 Th e chemical composition of stainless-steel valve components shall contain not less than 15 percent chromium or more than 0.25 p
44、ercent carbon and shall be processed to reduce the formation of chromium carbides.4.2.4.5.3 Stainless-steel valve components, when used, shall be made to ASTM-recognized alloy specifi cations with metal and alloys in the UNS. Stain-less-steel alloys are not limited to those specifi ed herein. All st
45、ainless-steel alloys, however, must meet the performance requirements of this standard, including, but not limited to, minimum yield strength and chemical requirements.4.2.4.5.4 After fi nal forming and machining, exogenous iron shall be removed from fi nished stainless-steel components that come in
46、 contact with potable water, or those components shall be passivated in accordance with ASTM A380. All other stainless-steel components shall be cleaned and descaled per the manufacturers requirements.4.2.4.6 Elastomers. Elastomers shall comply with the following:4.2.4.6.1 Rubber shall be resistant
47、to microbiological attack, copper poi-soning, and ozone attack.4.2.4.6.2 Rubber compounds shall contain no more than 8 ppm (parts per million) of copper ion and shall include copper inhibitors to prevent copper degra-dation of the rubber material.4.2.4.6.3 Rubber compounds shall be capable of withst
48、anding an ozone resistance test when tested in accordance with ASTM D1149. Th e tests shall be conducted on the unstressed samples for 70 hr at 104F (40C) with an ozone con-centration of 50 pphm (parts per hundred million), and there shall be no visible cracking in the surfaces of the test samples a
49、fter tests.4.2.4.6.4 Rubber compounds shall have a maximum compression set value of 20 percent when tested in accordance with ASTM D395 method B for 22 hr at 158F (70C).4.2.4.6.5 Rubber compounds shall contain no more than 1.5 parts of wax per 100 parts of rubber hydrocarbon and shall have less than a 2 percent volume increase when tested in accordance with ASTM D471 after being immersed in distilled water at 73.4F 2F (23C 1C) for 70 hr. Reclaimed rubber shall not be used.4.2.4.6.6 Rubber compounds shall be free from vegetable oils, vegetable-oil deriva
