BS 5158-1989 Specification for cast iron plug valves《铸铁旋塞阀规范》.pdf

1、BRITISH STANDARD BS5158:1989 Specification for Cast iron plug valves UDC621.646.6034:669.13.018.29BS5158:1989 This British Standard, having been prepared under the directionof the Piping Systems Components Standards Policy Committee, was published underthe authority of the Boardand comes into effect

2、 on 29September1989 BSI 03-1999 First published October1974 First revision The following BSI references relate to the work on this standard: Committee reference PSE/7 Draft for comment88/71221 DC ISBN 0 580 17347 X Committees responsible for this British Standard The preparation of this British Stan

3、dard was entrusted by the Piping Systems Components Standards Policy 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 Brass Founders Association

4、of Building Component Manufacturers Ltd. British Chemical Engineering Contractors Association British Compressed Gases Association British Foundry Association British Gas plc British Maritime Technology British Plumbing Fittings Manufacturers Association British Shipbuilders British Valve and Actuat

5、or Manufacturers Association Chartered Institution of Building Services Engineers Copper Development Association Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Energy Industries Council Engineering Equipment and Materials Users Association G

6、AMBICA (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 Casting Research and Tra

7、de Association Water Authorities Association Water Companies Association The following body was also represented in the drafting of the standard, through subcommittees and panels: Scottish Council Development and Industry Amendments issued since publication Amd. No. Date of issue CommentsBS5158:1989

8、 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Definitions 1 3 Valve patterns 2 4 Nominal sizes 2 5 Pressure designation 2 6 Pressure/temperature ratings 2 7 Dimensions 2 Section 2. Design and materials 8 Design 4 9 Operation 5 10 Ma

9、terials 5 Section 3. Testing 11 Pressure testing 7 12 Anti-static testing 7 13 Manufacturers certificate 7 Section 4. Marking 14 General 8 Section 5. Preparation for storage and transportation 15 General 9 16 Body ends 9 Appendix A Information to be specified by purchaser 10 Appendix B Typical plug

10、valve constructions 10 Figure 1 Location of tappings 4 Figure 2 Lubricated plug valve. Parallel plug 11 Figure 3 Lubricated plug valve. Taper plug (simple gland) 12 Figure 4 Lubricated plug valve. Taper plug (compound gland) 13 Figure 5 Soft seated plug valve 14 Table 1 Nominal size of valves and pr

11、essure designation 2 Table 2 Minimum pressure/temperature soft seat ratings 3 Table 3 Minimum outside diameters of sealing faces for parallelthreadedvalves 3 Table 4 Body tappings 4 Table 5 Typical material symbols 8 Publications referred to Inside back coverBS5158:1989 ii BSI 03-1999 Foreword This

12、revision of BS5158 has been prepared under the direction of the Piping Systems Components Standards Policy Committee and supersedes BS5158:1974 which is withdrawn. The opportunity has been taken in carrying out this revision to introduce internationally agreed pressure/temperature ratings, based on

13、the definition of nominal pressure (PN) given in ISO7268, published by the International Organization for Standardization (ISO), covering ratings previously given in German (DIN) and American (ANSI) standards. However, in this revision the use of PN has been limited to valves with flanges designated

14、 PN10, PN16 and PN25 in accordance with BS4504-3.2. For valves with flanges complying with BS1560-3.2, Class ratings have been retained. This revision also takes account of the latest agreements in ISO/TC153/SC1, ValvesDesign, construction, marking and testing, and ISO/TC5/SC10, Metallic flanges and

15、 their joints. On this basis the terminology and definitions in this standard are in accordance with those given in ISO standards and the minimum bore dimensions conform to those agreed in ISO/TC153/SC1. However, at the time of publication of this British Standard no corresponding international stan

16、dard exists. The main differences between this British Standard and BS5158:1974 are as follows. a) Only cast iron bodied plug valves are covered (steel bodied plug valves are now covered only in BS5353). b) Nominal sizes DN10 for flanged-end valves and for threaded-end valves have been omitted. c) C

17、ast iron plug valves designated Class150, Class250 and Class300 have been included for the first time. d) Pressure/temperature ratings of body materials have been revised to align with BS1560-3.2 and BS4504-3.2, as appropriate, and minimum pressure/temperature ratings for soft seat materials have be

18、en included for the first time. e) More details are specified for design and operation requirements. f) Anti-static requirements are given for soft seated and lined valves. g) A greater choice of materials is available for the pressure-containing shell and some requirements are given for trim compon

19、ents. h) Production pressure testing is now in accordance with BS6755-1. The minimum pressure/temperature seat ratings given in this standard for soft seated valves are based on the use of PTFE without fillers, of virgin material completely free of reclaimed processed material for the valve seats, b

20、ut attention is drawn to the use of alternative seat materials that could give higher pressure/temperature ratings. Pressure/temperature ratings of the soft seated valve are dependent on both the body rating and the pressure capability of the seats. Seat pressure capability will be limited by the st

21、rength of the seat material, particularly by the loss of strength which may occur at elevated temperatures. The applicable valve pressure rating at any temperature will, therefore, be limited by either the body rating or the seat rating. Throughout this British Standard those dimensions shown in par

22、entheses are non-preferred. The non-preferred sizes are given for replacement of existing valves; they are not recommended for new pipework systems. Attention is drawn to BS5353 which specifies steel plug valves for more arduous duties than valves covered by this standard and to BS6683 for guidance

23、on the installation of valves.BS5158:1989 BSI 03-1999 iii Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled wi

24、th assessment of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certification schemes will be forwarded by BSI to the association of Certification Bodies. If a third party certification scheme does not already exist, users should c

25、onsider approaching an appropriate body from the list of Association members. 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 con

26、fer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to14, 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

27、the amendment table on theinside front cover.iv blankBS5158:1989 BSI 03-1999 1 Section 1. General 1 Scope This British Standard specifies the requirements for valve seat and body pressure/temperature ratings and for the design, including materials, dimensions, operation, performance, testing and mar

28、king of lubricated, and soft seated and lined cast iron plug valves having anti-static requirements. It applies to short, regular and venturi pattern valves. The range of valves covered by this standard is given in Table 1 (see also clause4). NOTE 1The information to be supplied by the purchaser at

29、the time of the enquiry and/or order is given inAppendix A. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purpose of this British Standard, the following definitions apply. 2.1 face-to-face dimension (for flanged-end valv

30、es) the distance, expressed in millimetres, between the two planes perpendicular to the valve axis located at the extremities of the body end ports 2.2 anti-static design a feature which may be inherent or incorporated in the design of the valve that ensures electrical continuity between the plug, s

31、tem and the body of the valve 2.3 nominal size (DN) a numerical designation of size which is common to all components in a piping system other than those components designated by outside diameter or by thread size. It is a convenient round number for reference purposes and it is normally only loosel

32、y related to manufacturing dimensions NOTE 1Nominal size is designated by the letters DN followed by a number. NOTE 2.This definition is identical with that given in ISO6708. 2.4 nominal pipe size (NPS) a designation of size in inches which is common to all components in a piping system other than t

33、hose 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 designated by the letters NPS followed by a number. NOTE 2NPS is used only in association with the Class rat

34、ing system. 2.5 thread size (TS) a fractional designation of size independent of any unitary system that is used to identify threaded connections in valves (see BS21) 2.6 nominal pressure (PN) a numerical designation which is a convenient rounded number for reference purposes all the equipment of th

35、e same nominal size (DN) designated by the same PN number shall have compatible mating dimensions NOTE 1The maximum allowable working pressure depends on materials, design and working temperatures, and should be selected from the tables of pressure/temperature ratings given in the appropriate standa

36、rds. NOTE 2Nominal pressure is designated by the letters PN followed by the appropriate reference number. NOTE 3This definition is identical with that given in ISO7268. 2.7 class a numerical designation for reference purposes NOTE 1The maximum allowable working pressure depends on materials, design

37、and design temperature and should be selected from the tables of pressure/temperature ratings given in the appropriate standards. NOTE 2Class is designated by the word Class followed by the appropriate reference number. 2.8 lubricated plug valve a valve having the mating surfaces of the plug and bod

38、y separated from each other by a pressurized, renewable film of lubricant/sealant (seeFigure 2,Figure 3 andFigure 4) 2.9 soft seated plug valve a non-lubricated valve having soft seats of a low frictional material fitted between the body and plug (seeFigure 5) 2.10 lined plug valve a valve having a

39、fully moulded, bonded or keyed non-removable lining on all internal wetted surfaces that may be lubricated or non-lubricated 2.11 short plug valve a valve having face-to-face dimensions corresponding with wedge gate valves complying with BS2080 2.12 regular plug valve a valve generally having plug p

40、orts of greater area than short or venturi valvesBS5158:1989 2 BSI 03-1999 2.13 venturi plug valve a valve having reduced plug port area and a body throat approximating to a venturi 3 Valve patterns Valves shall be short, regular or venturi pattern. NOTEIn Classes125 and150, PN10 and PN16 the ventur

41、i and regular pattern are available only in the long series of end-to-end dimensions in accordance with BS2080. In all other cases short, venturi and regular pattern valves have the same end-to-end dimensions. 4 Nominal sizes Valves shall be of nominal sizes (DN) or nominal pipe sizes (NPS) or threa

42、d sizes (TS) according to type of end fitting as given inTable 1 5 Pressure designation Pressure designation of valves shall be as given inTable 1. Table 1 Nominal size of valves and pressure designation 6 Pressure/temperature ratings NOTE 1The pressure/temperature ratings of the linings of lined va

43、lves are outside the scope of this standard. NOTE 2Since the maximum or minimum operating temperature may be limited by the grade of lubricant/sealant used in the valve, attention is drawn to10.11. 6.1 Soft seated valves Minimum pressure/temperature seat ratings of soft seated valves shall be as giv

44、en inTable 2. With the exception of the soft seats and primary seals, all valve components shall be capable of withstanding the pressure/temperature ratings as specified in BS1560-3.2 or BS4504-3.2, as appropriate. 6.2 Metal seated valves Pressure/temperature ratings of metal seated valves shall be

45、as specified in BS1560-3.2 or BS4504-3.2, as appropriate. 7 Dimensions 7.1 Flanged-end valves 7.1.1 Flange dimensions shall comply with BS1560-3.2 for Class designated valves or BS4504-3.2 for PN designated valves. NOTESeeTable 1 for PN/Class relationship. 7.1.2 Face-to-face dimensions shall comply

46、with BS2080. Valves having flanges complying with BS4504-3.2 and pressure ratings (PN) as given inTable 1 shall have the same face-to-face dimensions as the corresponding Class designated valves (seeTable 1). 7.2 Threaded-end valves 7.2.1 Valve ends shall have internal taper threads complying with A

47、NSI/ASMEB1.20.1 or internal taper or parallel threads complying with BS21. 7.2.2 End faces of valves with parallel threaded ends shall be at right angles to the thread axis. The minimum outside diameter of the sealing faces shall comply withTable 3. 7.3 Bolting 7.3.1 Bolting threads shall be in acco

48、rdance with the following ISO metric or unified inch standards, as appropriate. 7.3.2 When used, valve body/cover bolting shall be of minimum size M10() in). Nominal size of valve Pressure designation DN NPS or TS Class 125and150 PN10, PN16 Class 250and300 PN25 15 AB AB 20 AB AB 25 1 AB AB (32) (1)

49、AB AB 40 1 AB AB 50 2 AB AB (65) (2) AB AB 80 3 AB AB 100 4 AB AB 150 6 A A 200 8 A A 250 10 A A 300 12 A A 350 14 A A 400 16 A A 450 18 A A 500 20 A A 600 24 A A NOTE 1A=flanged ends only, B=threaded ends only. NOTE 2Non-preferred sizes are shown in parentheses (seeforeword). metric inch BS3692 BS1768 (below in) BS4190 BS1769 BS4439 BS2693-1 BS4882 BS4882BS5158:1989 BSI 03-1999 3 Table 2 Minimum pressure/temperature soft seat ratings Table 3 Minimum outside diameters of sealing faces for parallel threaded valves Nominal size of valve DN