BS 5157-1989 Steel gate (parallel slide) valves.pdf
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1、BRITISH STANDARD BS 5157:1989 Specification for Steel gate (parallel slide) valves UDC 621.646.5:669.14:001.4:620.1 BS 5157:1989 This British Standard, having been prepared under the direction of the Piping Systems Components Standards Committee, was published under the authority of the Board of BSI
2、 and comes into effect on 31 July 1989 BSI 04-1999 First published December 1974 First revision July 1989 The following BSI references relate to the work on this standard: Committee reference PSE/7 Draft for comment 87/72143 DC ISBN 0 580 17297 X Committees responsible for this British Standard The
3、preparation of this British Standard was entrusted by the Piping Systems Components Standards Committee (PSE/-) to Technical Committee PSE/7, upon which the following bodies were represented: Amalgamated Union of Engineering Workers Associated Offices Technical Committee Association of Bronze and Br
4、ass Founders Association of Building Component Manufacturers Ltd. British Chemical Engineering Contractors Association British Compressed Gases Association British Foundry Association British Gas plc British Maritime Technology British Shipbuilders British Valve and Actuator Manufacturers Associatio
5、n Ltd. Chartered Institution of Building Services Engineers Copper Development Association Copper Tube Fittings Manufacturers Association Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Energy Industries Council Engineering Equipment and Mate
6、rials Users Association GAMBICA (BEAMA Ltd.) Health and Safety Executive Institute of British Foundrymen Institution of Chemical Engineers Institution of Gas Engineers Institution of Mechanical Engineers Institution of Water and Environmental Management (IWEM) Society of British Gas Industries Steel
7、 Casting Research and Trade Association Water Authorities Association Water Companies Association The following body was also represented in the drafting of the standard, through sub-committees: Combustion Engineering Association Amendments issued since publication Amd. No.Date of issueComments BS 5
8、157:1989 BSI 04-1999i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 1.1Scope1 1.2Definitions1 1.3Valve patterns1 1.4Size ranges1 1.5Nominal pressure (PN) and Class designation1 1.6Pressure/temperature ratings2 Section 2. Body ends 2.1Flanged body ends4 2.2Butt
9、-weld body ends4 Section 3. Design 3.1Bodies6 3.2By-pass6 3.3Body to bonnet connection6 3.4Stems6 3.5Operation6 3.6Bolting6 3.7Seats6 3.8Disks7 3.9Stem glands7 3.10Yokes7 3.11End connections7 Section 4. Materials 4.1Pressure containing shell8 4.2Disks and body seats8 4.3Facings for disk, body seat a
10、nd body8 4.4Stems8 4.5Stem glands, body seals and gaskets8 4.6Bolting8 4.7Handwheel8 Section 5. Testing 5.1Production pressure testing9 5.2Test certificate9 5.3Manufacturers certificate9 Section 6. Marking 6.1General10 6.2Body markings10 6.3Identification plate markings10 6.4Material symbols10 6.5Om
11、ission of markings10 Section 7. Preparation for storage and transportation 7.1General11 7.2Body ends11 7.3Disk position11 BS 5157:1989 ii BSI 04-1999 Page Appendix A Information to be supplied by purchaser12 Appendix B Weld-end preparations13 Appendix C Approximate diameters of body end ports14 Appe
12、ndix D Typical steel gate (parallel slide) valves15 Figure 1 Weld-end preparation13 Figure 2 Venturi pattern with eyelet15 Figure 3 Full bore pattern without eyelet16 Figure 4 Pressure seal and bolted bonnet assemblies17 Table 1 Pressure/temperature ratings for Special Class butt-weld end valves: ma
13、terial carbon steel2 Table 2 Pressure/temperature ratings for Special Class butt-weld end valves: material carbon molybdenum steel2 Table 3 Pressure/temperature ratings for Special Class butt-weld end valves: material 1 % chromium % molybdenum steel and 1 % chromium % molybdenum steel2 Table 4 Press
14、ure/temperature ratings for Special Class butt-weld end valves: material 2 % chromium 1 % molybdenum steel3 Table 5 Face-to-face dimensions and tolerances for flanged end valves with raised faces4 Table 6 End-to-end dimensions and tolerances for valves with body ends flanged to BS 1560-3.1 having ri
15、ng-joint faces5 Table 7 End-to-end dimensions and tolerances for butt-weld end valves5 Table 8 Drain tapping sizes6 Table 9 Materials for body, bonnet and stuffing box8 Table 10 Test durations9 Table 11 Trim material identification symbols10 Table 12 Weld-end preparation13 Table 13 Approximate diame
16、ters of body end ports14 Publications referred toInside back cover BS 5157:1989 BSI 04-1999iii Foreword This British Standard has been prepared under the direction of the Piping Systems Components Standards Committee and constitutes the revision of BS 5157:1974 which is withdrawn. At the time of pub
17、lication of this British Standard, no corresponding international standard exists. In carrying out this revision, the types and ranges of valves covered have been changed. The essential differences between this British Standard and BS5157:1974 are: a) valves having butt-weld ends are included for th
18、e first time; b) valves having nominal pressure (PN) designations are limited to PN 16, PN 25 and PN 40 in accordance with BS 4504-3.1 and international philosophy on pressure designation; c) valves of Class 400 designation have been omitted; d) tolerances on face-to-face and end-to-end dimensions h
19、ave been changed to obtain a practical compromise between European and American practices and this will become the practice for future British Standards for valves; e) the materials given for the body, bonnet and stuffing box have been updated and are now a requirement; f) production pressure testin
20、g requirements are now specified in detail by reference to BS 6755-1 and the test durations are generally longer. Assessed capability. Users of this British Standard are advised to consider the desirability of assessment and registration of a suppliers quality systems against the appropriate Part of
21、 BS 5750 by a third party certification body. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligati
22、ons. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the
23、inside front cover. iv blank BS 5157:1989 BSI 04-19991 Section 1.General 1.1 Scope This British Standard specifies requirements for flanged end and butt-weld end carbon, carbon molybdenum and chromium molybdenum steel gate valves of the parallel slide type having hard metal, nickel alloy or stainles
24、s steel facings. It covers valves of pressure designations PN 16, PN 25 and PN 40 with ends flanged in accordance with the appropriate tables of BS 4504-3.1 and Class 150, Class 300 and Class 600 designated valves with butt-weld ends and with ends flanged in accordance with the appropriate tables of
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