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1、BRITISH STANDARD CONFIRMED NOVEMBER 1997 BS 5151:1974 Incorporating Amendment Nos. 1 and 2 Specification for Cast iron gate (parallel slide) valves for general purposes UDC 621.646.5:669.13 BS 5151:1974 This British Standard, having been approved by the Mechanical Engineering Industry Standards Comm
2、ittee, was published under the authority of the Executive Board on 10 September 1974 BSI 09-1999 First published as BS 3948, January 1962 First revision November 1965 Second revision as BS 5151, September 1974 The following BSI references relate to the work on this standard: Committee reference MEE/
3、81 Draft for comment 72/34132 DC ISBN 0 580 08069 2 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial or
4、ganizations: Associated Offices Technical Committee*Department of Industry National Association of Consulting EngineersEngineering Laboratory Association of Hydraulic Equipment Department of Trade Manufacturers Ltd.Electricity Supply Industry in England and Association of Mining Electrical and Wales
5、* Mechanical EngineersEngineering Equipment Users Association* British Compressed Air Society*Federation of Manufacturers of Construction British Electrical and Allied Manufacturers Equipment and Cranes AssociationInstitution of Gas Engineers* British Gas Corporation*Institution of Heating and Venti
6、lating British Gear Manufacturers AssociationEngineers* British Internal Combustion Engine Institution of Mechanical Engineers* Manufacturers AssociationInstitution of Plant Engineers British Mechanical Engineering Institution of Production Engineers* ConfederationLondon Transport Executive British
7、Pump Manufacturers AssociationMachine Tool Trades Association British Steel CorporationMinistry of Defence* British Steel Industry*Ministry of Defence, Army Department* Crown Agents for Oversea Governments and National Coal Board AdministrationsProcess Plant Association Department of Employment (HM
8、Factory Railway Industry Association of Great Inspectorate)*Britain Department of the Environment*Royal Institute of British Architects Department of Industry Mechanical Telecommunication Engineering and EngineeringManufacturing Association The organizations marked with an asterisk in the above list
9、, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Bronze and Brass Founders British Chemical Engineering Contractors Institute of Quality Assurance AssociationInstitution of Chemical Engineers British Ind
10、ustrial Measuring and Control Institution of Civil Engineers Apparatus Manufacturers AssociationInstitution of Municipal Engineers British Ship Research AssociationInstitution of Water Engineers British Valve Manufacturers Association Ltd.Metropolitan Water Board CBMPENational Brassfoundry Associati
11、on Chemical Industries Association Ltd.Oil Companies Materials Association Greater London CouncilSociety of British Gas Industries Institute of British FoundrymenWater Companies Association Institute of Marine Engineers Amendments issued since publication Amd. No.Date of issueComments 2317August 197
12、7 3926June 1982Indicated by a sideline in the margin BS 5151:1974 BSI 09-1999i Contents Page Co-operating organizationsInside front cover Forewordiii Section 1. General 1Scope1 2References1 3Terminology and definitions1 4Types1 5Nominal sizes1 6Nominal pressure1 7Pressure/temperature ratings1 Sectio
13、n 2. Body ends 8Flanged body ends2 Section 3. Design and manufacture 9Bodies2 10Body to bonnet connection2 11Stems3 12Operation3 13Bolting3 14Seats3 15Disks3 16Stem sealing3 17Yokes3 Section 4. Materials 18Choice of materials4 19Trim4 Section 5. Testing and inspection 20Testing5 21Test certificate5
14、22Inspection5 23Witnessing of tests5 24Certificate of conformity5 Section 6. Preparation for despatch 25After testing5 26Disk position5 27Body ends6 Section 7. Marking 28General6 29Body markings6 30Identification plate markings6 31Body or identification plate marking6 32Material symbols6 33Additiona
15、l markings6 34Omission of markings6 Section 8. Valves for use in ANSI flanged piping systems 35Requirements6 Section 9. Enquiry or order information 36Information to be supplied7 BS 5151:1974 ii BSI 09-1999 Page Appendix A Cast iron gate (parallel slide) valves for general purposes with ANSI Class 1
16、25 flanges8 Table 1 Pressure/temperature rating1 Table 2 Face-to-face dimensions2 Table 3 Dimensions of body end ports and seat bores2 Table 4 Basic materials4 Table 5 Test durations5 Table 6 Dimensions of ANSI Class 125 flanges8 Table 7 Pressure/temperature ratings for Class 125 valves9 Table 8 Tes
17、t pressure (gauge) for Class 125 valves9 Publications referred toInside back cover BS 5151:1974 BSI 09-1999iii Foreword This British Standard was first published as BS 3948 in 1962 and revised in 1965. This major revision, prepared under the authority of the Mechanical Engineering Industry Standards
18、 Committee, is in metric units. It is one of a series of new and revised standards in metric units for general purpose valves which have a new series of consecutive numbers. There are no International or European Standards in this field, but account has been taken of all relevant proposals under con
19、sideration in the ISO Technical Committee and CEN1) Working Group concerned with general purpose valves. The standard is based on the use of flanges complying with the requirements of BS 4504 “Flanges and bolting for pipes, valves and fittings. Metric series” but, by use of Appendix A, the appropria
20、te modifications can be made when using ANSI Class 125 flanges. 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 f
21、rom legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 10, 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 amend
22、ment table on the inside front cover. 1) European Committee for Standardization iv blank BS 5151:1974 BSI 09-19991 Section 1. General 1 Scope This British Standard specifies requirements for flanged body end cast iron gate valves of the parallel slide type, copper alloy faced, nickel alloy faced and
23、 stainless steel faced, for general purposes. It covers valves of nominal pressure (PN) designations of 10 bar2) to 25 bar with ends flanged in accordance with the appropriate tables of BS 4504, nominal sizes (DN) 40 to 1 000 inclusive. However, when valves are required for use in ANSI (BS 1560) fla
24、nged systems, reference should be made to clause 34 and Appendix A. Where there is an appropriate application standard or code of practice it is the responsibility of the purchaser to ensure that its requirements are complied with; for example, attention is drawn to BS 806 and BS 759. 2 References T
25、he titles of the British Standards referred to in this standard are listed on the inside back cover. 3 Terminology and definitions For the purposes of this British Standard the terminology and definitions given in BS 2591-1 are generally applicable. The following definition also applies: face-to-fac
26、e dimension the distance between the two planes perpendicular to the valve axis located at the extremities of the body end ports 4 Types Valves shall be of one of the following types: a) rising stem; b) non-rising stem. 5 Nominal sizes The range of nominal sizes (DN) shall be as follows: 6 Nominal p
27、ressure Valves shall be designated by nominal pressure (PN), defined as the maximum permissible gauge working pressure (bar) at 20 C, as follows: PN 10, PN 16 and PN 25 7 Pressure/temperature ratings 7.1 The valves specified in this standard shall have maximum ratings for liquid, gas and steam as de
28、tailed in Table 1. 7.2 Restrictions on temperature may be placed by the manufacturer on valves in accordance with this standard by reason of valve type, trim materials or other factors, in which case valves shall be marked with the limiting temperature see clause 30 b). All valves, however, shall be
29、 suitable for continuous use at their PN designation within the temperature range of 10 C to 65 C. Table 1 Pressure/temperature rating 2) 1 bar = 105 N/m2 = 102 kPa. 40506580100125150200250 300 350400450500600700800900 1 000 1234567 Nominal pressure PN BS 4504 table number Maximum permissible gauge
30、working pressures at temperatures (C) of: 10 to 120150180200220 barabarabarabarabara 1010/11109.28.588 1616/111614.813.91313 2525/11252321.22019 NOTEIntermediate values can be obtained by linear interpolation. a 1 bar = 105 N/m2= 102 kPa. BS 5151:1974 2 BSI 09-1999 Section 2. Body ends 8 Flanged bod
31、y ends 8.1 Flange dimensions shall comply with the relevant requirements of BS 4504. 8.2 Flanges shall be at right angles to the axis of the bore and concentric with the bore. Flanges shall be drilled unless otherwise specified and the bolt holes shall be “off centres”. 8.3 The face-to-face dimensio
32、ns shall be as detailed in Table 2. Table 2 Face-to-face dimensions 8.4 The tolerances on the face-to-face dimensions detailed in Table 2 shall be as follows: Section 3. Design and manufacture 9 Bodies 9.1 Body end ports. The body end ports shall be circular. Table 3 gives approximate values for gui
33、dance only for the bore dimensions at the body end ports. 9.2 Seat bores. Seat bores shall be circular and not less than the dimensions given in Table 3, but any lugs required to facilitate the fitting of seat rings may intrude into the bore. Table 3 Dimensions of body end ports and seat bores 10 Bo
34、dy to bonnet connection The attachment of the bonnet to the body shall be adequate to withstand the appropriate test pressures, service conditions, and the mechanical loads encountered in operation. Valves shall have bolted connections. 123 Nominal sizeFace-to-face dimensions for nominal pressure of
35、: DNPN 10/16PN 25 mmmm 40165190 50178216 65190241 80203283 100229305 125254381 150267403 200292419 250330457 300356502 350381572 400406610 450432660 500457711 600508787 700620 800680 900740 1 000760 Face-to-face dimensionsTolerance mmmm Above0 up to and including 200 1 Above 200 up to and including
36、400 2 Above 400 up to and including 600 3 Above 600 up to and including 787 4 1234 Nominal sizeBore dimensions for PN ratings of: DNPN 10PN 16PN 25 mmmmmm 40404040 50505050 65656565 80808080 100100100100 125125125125 150150150150 200200200200 250250250250 300300300300 350350335335 400400385385 45045
37、0440430 500500490485 600600590585 700700690 800800792 900900891 1 0001 000989 BS 5151:1974 BSI 09-19993 11 Stems Stems, or spindles, shall be of one of the following types: a) inside screw, having the actuating thread within the pressure containing components; or b) outside screw, having the actuati
38、ng thread outside the pressure containing components. The actuating thread should preferably be of the trapezoidal form, but the square form is acceptable. 12 Operation 12.1 Means. Unless otherwise specified, valves shall be designed to be directly operated by a handwheel. 12.2 Direction. Unless oth
39、erwise specified, manually operated valves shall be closed by turning the handwheel in a clockwise direction when facing the handwheel. 12.3 Handwheels. Handwheels shall be marked CLOSE or SHUT with an arrow to indicate the direction of closure. In addition, handwheels may be marked OPEN with an arr
40、ow to indicate the anti-clockwise direction of opening. Alternatively, these markings may be shown on a plate secured below the handwheel nut. Handwheels shall be fitted in such a way that, whilst held securely, they may be removed and replaced when necessary. The design of the handwheel, or the met
41、hod of handwheel to stem attachment, shall be such as to permit the fitting by the purchaser of a 1.5 mm thick service nameplate. 12.4 Indicators. When specified by the purchaser an indicator shall be provided. The marking shall show both OPEN and SHUT positions. 12.5 Chainwheel operation. If chainw
42、heel operation is required, the type of chainwheel shall be specified in the order which shall also specify any chain to be supplied. 12.6 Gear operation. If gear operation is required, the type of gearing and its arrangement shall be specified in the enquiry and order. 12.7 Actuator operation. If a
43、ctuator operation is required, the details of the actuator and its power supply together with the design maximum pressure differential across the valve shall be specified in the enquiry and order. The dimensions of the actuator attachment flange shall comply with the requirements of BS . . . . “Flan
44、ge attachment dimensions of actuators to general purpose valves” (in course of preparation). 13 Bolting Bolting threads shall be in accordance with ISO metric or Unified inch standards. The dimensions and finish of bolting shall comply with the requirements of the following British Standards as may
45、be appropriate: Metric: BS 3692, BS 4190, BS 4439, BS 4882. Inch: BS 1768 (below in), BS 1769, BS 2693-1, BS 2708, BS 4882. IMPORTANT NOTE For the period up to and including 31 December 1976, the following sentence A applies. From 1 January 1977, the following sentence B applies: A. Bolting with whi
46、tworth form threads complying with BS 916, BS 1083 or BS 2693-1 or bolting with other head forms otherwise complying with the requirements of the specified standards is not precluded. B. Bolting with other head forms otherwise complying with the requirements of the specified standards is not preclud
47、ed. 14 Seats Body seat rings shall be so fitted as to avoid their becoming loose in service. Threaded seat rings shall be designed to facilitate removal. 15 Disks Disks shall be guided to ensure alignment relative to the body seats and the stem. The guides may be external to the body. 16 Stem sealin
48、g Valves shall be provided with means for sealing the stem. Glands, when fitted, of DN 40 valves may be screwed or bolted. Glands of valves above DN 40 shall be bolted. 17 Yokes Yokes may be integral with, or separate from, the bonnet. Adequate provision shall be made for lubrication. BS 5151:1974 4
49、 BSI 09-1999 Section 4. Materials 18 Choice of materials This standard is based on materials specified in Table 4. Unless otherwise agreed, the manufacturer has the option of selecting materials listed in Table 4 or using other materials, providing they are at least as suitable in all relevant respects. 19 Trim Where valves are required with a particular trim, this shall be specified by the purchaser and in this case the materials used shall be subject to agreement between the manufacturer and the purchaser. Table 4 Basic mat