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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 BS 5157:1974 are: a) valves having butt-weld ends are included for t
18、he 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
19、have 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 testi
20、ng 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 o
21、f 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 obligat
22、ions. 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 stainl
24、ess 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
25、of BS 1560-3.1 for nominal sizes DN 40 to DN 600 and NPS 1 to 24 inclusive. NOTE 1The information to be supplied by the purchaser at the time of enquiry/order is given in Appendix A. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 1.2 Definition
26、s For the purposes of this British Standard the following definitions apply. 1.2.1 nominal size (DN) (for PN designated valves) a numerical designation of size which is common to all components in a piping system other than components designated by outside diameters or by thread size. It is a conven
27、ient round number for reference purposes and is only loosely related to manufacturing dimensions NOTE 1Nominal size is designated by the letters DN followed by the appropriate number. NOTE 2This definition is identical with that given in ISO 6708. 1.2.2 nominal pipe size (NPS) (for Class designated
28、valves) a designation of size, in inches, which is common to all components in a piping system other than those components designated by outside diameter. It is a convenient number for reference purposes and it is normally only loosely related to manufacturing dimensions NOTE 1Nominal pipe size is d
29、esignated by the letters NPS followed by a number. NOTE 2NPS is used only in association with the Class system. 1.2.3 nominal pressure (PN) a numerical designation which is a convenient rounded number for reference purposes all equipment of the same nominal size (DN) designated by the same PN number
30、 shall have compatible mating dimensions NOTE 1The maximum permissible working pressure depends on materials, design and working temperatures and should be selected from the tables of pressure/temperature ratings given in the appropriate standard. NOTE 2Nominal pressure is designated by the letters
31、PN followed by the appropriate reference number. NOTE 3This definition is identical with that given in ISO 7268. 1.2.4 class a numerical designation for reference purposes NOTE 1The maximum allowable working pressure depends on materials, design and design temperature and should be selected from the
32、 tables of pressure/temperature ratings given in the appropriate standards. NOTE 2Class is designated by the word Class followed by the appropriate reference number. 1.2.5 special Class a term applied to Class designated butt-weld end valves which have specified quality requirements for body/bonnet
33、castings (see 4.1.1), or in the case of forged valve bodies are limited in size to NPS 5(DN 125) 1.2.6 face-to-face dimension (for flanged valves, excluding ring joint flanged valves) the distance, expressed in millimetres, between the connecting end facings upon which the gaskets are actually compr
34、essed 1.2.7 end-to-end dimension (for valves with butt-weld ends or ring joint flanges). the distance, expressed in millimetres, between the extremities of the connecting ends 1.3 Valve patterns Valves shall be full bore pattern or venturi pattern. NOTEIf a particular pattern is required the purchas
35、er should state the requirement on the enquiry and/or order (see Appendix A). 1.4 Size ranges Valves shall be one of the following sizes selected from the appropriate size range. PN designated range DN 40, DN 50, DN 65, DN 80, DN 100, DN 125, DN 150, DN 200, DN 250, DN 300, DN 350, DN 400, DN 450, D
36、N 500, DN 600 Class designated range 1 NPS, 2 NPS, 2 NPS, 3 NPS, 4NPS, 5 NPS, 6 NPS, 8 NPS, 10 NPS, 12 NPS, 14 NPS, 16 NPS, 18 NPS, 20 NPS, 24 NPS 1.5 Nominal pressure (PN) and Class designation Valves flanged in accordance with BS 4504-3.1 shall be designated by nominal pressure (PN) as follows: PN
37、 16, PN 25 and PN 40. BS 5157:1989 2 BSI 04-1999 Valves flanged in accordance with BS 1560-3.1 or with butt-weld ends shall be designated by Class as follows: Class 150, Class 300 and Class 600. 1.6 Pressure/temperature ratings 1.6.1 The pressure/temperature ratings applicable to valves designated b
38、y PN shall be as specified in BS 4504-3.1 for the particular body/bonnet material. 1.6.2 The pressure/temperature ratings applicable to flanged and butt-weld valves designated by Class (except for Special Class valves) shall be as specified in BS 1560-3.1 for the particular body/bonnet material. 1.6
39、.3 The pressure/temperature ratings applicable to Special Class butt-weld end valves shall be as given in Table 1 to Table 4, as appropriate, for the particular body/bonnet material. NOTERestrictions on temperature may be placed by the manufacturer on valves complying with this standard due to valve
40、 type, trim materials or other factors, in which case valves are marked with the limiting temperature see 6.3 d). Table 1 Pressure/temperature ratings for Special Class butt-weld end valves: material carbon steel Table 2 Pressure/temperature ratings for Special Class butt-weld end valves: material c
41、arbon molybdenum steel Table 3 Pressure/temperature ratings for Special Class butt-weld end valves: material 1 % chromium % molybdenum steel and 1 % chromium % molybdenum steel TemperatureMaximum permissible working pressure Class 150Class 300Class 600 C 29 to 38 50 100 150 200 250 300 350 375 400 4
42、25 450 475 500 bara 20.0 20.0 20.0 20.0 20.0 20.0 19.1 18.4 18.1 16.5 13.8 9.6 6.5 4.2 bara 51.7 51.7 51.7 51.7 51.7 51.7 49.9 48.1 47.2 43.1 35.9 25.0 16.9 11.0 bara 103.4 103.4 103.4 103.4 103.4 103.4 99.7 96.3 94.5 86.3 71.9 50.1 33.9 22.0 NOTE 1For temperature limitations on specific materials s
43、ee Table 9. NOTE 2Intermediate values may be obtained by linear interpolation. a 1 bar = 105 N/m2 = 105 Pa. TemperatureMaximum permissible working pressure Class 150Class 300Class 600 C 29 to 38 50 100 150 200 250 300 350 375 400 425 450 475 500 bar 18.4 18.4 18.4 18.4 18.4 18.4 18.4 18.4 18.4 18.4
44、18.4 18.0 16.1 11.5 bar 47.9 47.9 47.9 47.9 47.9 47.9 47.9 47.9 47.9 47.9 47.9 46.9 42.1 30.1 bar 95.8 95.8 95.8 95.8 95.8 95.8 95.8 95.8 95.8 95.8 95.8 93.8 84.2 60.2 NOTE 1For temperature limitations on specific materials see Table 9. NOTE 2Intermediate values may be obtained by linear interpolati
45、on. TemperatureMaximum permissible working pressure Class 150Class 300Class 600 C 29 to 38 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 bar 20.0 20.0 20.0 20.0 20.0 20.0 20.0 18.8 18.1 17.5 16.8 16.2 15.2 13.3 9.7 6.1 4.1 2.8 bar 51.7 51.7 51.7 51.7 51.7 51.7 51.7 49.2 47.3 45.
46、7 43.9 42.3 39.6 34.7 25.3 16.0 10.6 7.4 bar 103.4 103.4 103.4 103.4 103.4 103.4 103.4 98.3 94.7 91.5 87.7 84.5 79.1 69.5 50.7 31.9 21.2 14.7 NOTE 1Consideration should be given to the possibility of excessive oxidation (scaling) at temperatures above 566 C. NOTE 2For temperature limitations on spec
47、ific materials see Table 9. NOTE 3Intermediate values may be obtained by linear interpolation. BS 5157:1989 BSI 04-19993 Table 4 Pressure/temperature ratings for Special Class butt-weld end valves: material 2 % chromium 1 % molybdenum steel TemperatureMaximum permissible working pressure Class 150Cl
48、ass 300Class 600 C 29 to 38 50 100 150 200 250 300 350 375 400 425 450 475 500 525 550 575 600 bar 20.0 20.0 20.0 20.0 20.0 19.5 19.5 19.5 19.4 19.3 19.0 18.1 16.4 13.7 10.5 7.8 5.6 3.7 bar 51.7 51.7 51.7 51.7 51.7 51.0 50.8 50.8 50.5 50.2 49.7 47.2 42.8 35.7 27.4 20.5 14.6 9.5 bar 103.4 103.4 103.4
49、 103.4 103.4 102.0 101.7 101.5 101.0 100.4 99.4 94.3 85.5 71.4 54.8 40.9 29.3 19.1 NOTE 1Consideration should be given to the possibility of excessive oxidation (scaling) at temperatures above 566 C. NOTE 2For temperature limitations on specific materials see Table 9. NOTE 3Intermediate values may be obtained by linear interpolation. BS 5157:1989 4 BSI 04-1999 Section 2. Body ends 2.1 Flanged body ends 2.1.1 Flange dimensions and facing types shall comply with BS 4504-3.1 for PN designated valves or