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1、BRITISH STANDARDBS 5433:1976Incorporating Amendment Nos.1 and 2Specification forUnderground stopvalves for water servicesUDC 696.117:621.646.651CONFIRMED DECEMBER 2007BS 5433:1976This British Standard,having been prepared under thedirection of the Sanitary Appliances Standards Committee,was publishe
2、d under the authority of the Executive Board on30 November 1976 BSI 08-1999The following BSI references relate to the work on this standard:Committee reference SEB/2Draft for comment 73/13411 DCISBN 0 580 09630 0Cooperating organizationsThe Sanitary Appliances Standards Committee,under whose supervi
3、sion this British Standard was prepared,consists of representatives from the following Government departments and scientific and industrial organizations:British Bath Manufacturers Association*Institution of Public Health EngineersBritish Plastics Federation*Metal Sink Manufacturers AssociationCounc
4、il of British Ceramic SanitarywareMinistry of DefenceManufacturers*National Brassfoundry Association*Department of the Environment*National Federation of Builders andEnvironmental Health Officers AssociationPlumbers Merchants*Greater London Council*National Water Council*Institute of Plumbing*Royal
5、Institute of British ArchitectsInstitution of Heating and VentilatingRoyal Institute of Public Health and HygieneEngineers*Royal Society of Health*Institution of Municipal Engineers*Water Companies Association*The Government department and scientific and industrial organizations marked with an aster
6、isk in the above list,together with the following,were directly represented on the committee entrusted with the preparation of this British Standard:Association of Manufacturers of DomesticHeating and Ventilating ContractorsElectrical AppliancesAssociationBritish Gas CorporationInstitute of British
7、FoundrymenBritish Non-ferrous Metals TechnologyInstitution of Gas EngineersCentreInstitution of Water Engineers andBritish Valve Manufacturers AssociationScientistsCopper Ball Manufacturers AssociationNational Association of Plumbing,HeatingCopper Development Associationand Mechanical Services Contr
8、actorsCopper Tube Fittings ManufacturersSociety of British Gas IndustriesAssociationSouth London ConsortiumDepartment of the Environment,BuildingThames Water Authority MetropolitanResearch EstablishmentWater DivisionDepartment of Prices and ConsumerIndividual expertsProtectionAmendments issued since
9、 publicationAmd.No.Date of issueComments3570December 19814596September 1984Indicated by a sideline in the marginBS 5433:1976 BSI 08-1999iContentsPageCooperating organizationsInside front coverForewordiiiSection 1.General1Scope12References13Definitions14Illustrations15Nominal size16 Marking1Section 2
10、.Dimensions,testing and materials7Dimensions18Testing19Materials1Section 3.Workmanship10Castings311Forgings312Machining313Thickness of parts3Section 4.Design and construction14Waterway315Seat416Screw threads417Head seal418Washer plate419Bodies and heads520Method of attaching crutch or square head521
11、Clearance between crutch and stuffing box522Joint washers523Seat washers524Glands and gland packings525Union connections526Hexagonal shoulders6Figure 1 Underground stopvalve3Figure 2 Dimensions of underground stopvalve bodies8Figure 3 Dimensions of heads and glands10Figure 4 Square heads13Figure 5 D
12、imensions of crutches,spindles,washers and washer plates14Figure 6 Dimensions of ends,tail pipes and nuts18Table 1 Materials2Table 2 Head seal features5Table 3 Dimensions of underground stopvalve bodies7Table 4 Dimensions of heads and glands9Table 5 Dimensions of square heads,crutches,spindles washe
13、rs andwasher plates11Table 6 BS Whitworth threads(external)on spindles for engagement with head threads(internal)limits andtolerances:free class15Table 7 BS Whitworth threads(internal)on heads for engagement with spindle threads(external)limits and tolerances:normal class15BS 5433:1976ii BSI 08-1999
14、PageTable 8 BS Whitworth form screw threads(external)on heads for engagement with body threads(internal)limits and tolerances:medium class15Table 9 BS Whitworth form screw threads(internal)on bodies for engagement with head threads(external)limits and tolerances:medium class16Table 10 BS Whitworth f
15、orm screw threads(external)on glands for engagement with stuffing box threads(internal)limits and tolerances:medium class16Table 11 BS Whitworth form screw threads(internal)in stuffing box for engagement with gland threads(external)limits and tolerances:medium class16Table 12 Parallel spigot and con
16、e end tail pipes forunderground stopvalves17Publications referred toInside back coverBS 5433:1976 BSI 08-1999iiiForewordThis British Standard has been prepared under the authority of the Sanitary Appliances Standards Committee.The original idea for a British Standard for special stopvalves arose fro
17、m a proposal by the then British Waterworks Association(now National Water Council)who had carried out an investigation among their members into the use and behaviour of valves based on BS 1010:1959 when used underground.Experience of the exacting conditions and lack of accessibility in situations w
18、here they were installed led to the recommendation for a stronger valve with special design features to match the operating conditions.The dimensions given are those considered necessary to ensure the production of valves of nominal size to 2 suitable for underground water services.It is recommended
19、 that the body of the valve and the metal components be based on gunmetals and bronzes for strength and that attention be given to resistance against dezincification.There is provision for alternative methods of operation by means of either a crutch-type handle or a square top.Provision is made for
20、minimum opening torque so as to prevent the possibility of the head screwing out of the body when the stopvalve is being opened or turned with a key.BS 1010:1959 has been retained and retitled“Part 1:Imperial units”.Above-ground stopvalves are now included in the metric version BS 1010-2:1973.In thi
21、s standard,dimensions are expressed in metric terms except that pipe thread designations accord with BS 2779.Requirements for methods of testing suitability of materials for use in contact with water for domestic purposes will form the subject of a separate standard to be prepared under the directio
22、n of the Environment and Pollution Standards Committee(EPC/-).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
23、legal obligations.Summary of pagesThis 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
24、the inside front cover.ivblankBS 5433:1976 BSI 08-19991Section 1.General1 ScopeThis British Standard applies to copper alloy screwdown stopvalves of nominal sizes from to 2 for installation on underground water service pipes.The nominal size is that corresponding to the pipe size of the thread at th
25、e end connection.It includes stopvalves with ends screwed internally or externally or arranged in accordance with clause 25,and fitted with a crutch or with a square head.2 ReferencesThe titles of the publications referred to in this standard are listed on the inside back cover.3 DefinitionFor the p
26、urpose of this British Standard the following definition applies,together with any which are relevant in BS 2591-1.screwdown stopvalvesany valve in which a disc carrying a renewablenon-metallic washer is lifted from and lowered onto the body seat by a spindle whose axis is perpendicular to the face
27、of the body seat and having suitable means of connection for insertion in a pipeline.The use of the word valve or stopvalve herein shall be taken to mean an underground stopvalve4 IllustrationsIllustrations of typical stopvalves showing the component parts are given in Figure 1 to Figure 6.These ill
28、ustrations are not intended to indicate design.5 Nominal sizeStopvalves shall be designated by their nominal sizes;their dimensions shall be as specified inTable 3 to Table 12.6 MarkingStopvalves shall be legibly and permanently marked with the following information.On the headwork and body:a)manufa
29、cturers name or mark;b)the number of this British Standard,i.e.BS 5433.On the body:c)nominal size;d)direction of flow.Section 2.Dimensions,testing and materials7 DimensionsDimensions for screw threads shall comply with those specified in Table 6 to Table 11.Other dimensions for valve bodies and comp
30、onents shall be as specified in Table 3,Table 4 and Table 5.Dimensions for parallel spigot and cone end tail pipes shall be as specified in Table 12.8 TestingEvery stopvalve shall be tested in the assembled condition both in the fully closed position(seat test)and in the fully open position(body tes
31、t).In both cases the test shall consist of either a hydraulic test at not less than 21 bar1)or a pneumatic test at not less than 5 bar while the stopvalve is completely immersed in water.Alternatively,the body test may be carried out with the valve reversed and in the closed position.The valve being
32、 tested shall neither leak nor sweat during tests.9 Materials9.1 Composition.The preferred metallic materials for the component parts of underground stopvalves are those listed in Table 1.9.2 Alternative materials.Other metallic materials may be used provided that they are not less suitable than tho
33、se listed in Table 1,not more susceptible to corrosion,completely immune to dezincification and are not of lower mechanical strength.9.3 Materials in contact with supply water.The materials which are in contact with supply water,including“O”-rings,gland packings,seat washers and lubricants used in t
34、he construction,shall not constitute a toxic hazard and shall not foster microbiological growth or give rise to taste,odour,cloudiness or discoloration of the water.Attention is drawn to National Water Council requirements in this respect.1)1 bar=105 N/m2=100 kPa.BS 5433:19762 BSI 08-1999Table 1 Mat
35、erials 1234567892Basic material formSand castingsNon-forging stockForging stock3Stopvalve component partsMaterial specificationBS 1452 grade 12Cast ironBS 1400 LG1GunmetalBS 1400 LG2GunmetalBS 1400 LG4GunmetalBS 1400 LG2Continuous castgunmetalBS 2874 PB 102PhosphorbronzeBS 2872 CA 104Aluminium bronz
36、e4BodyXXX5HeadXXXXXX6Gland nominal size and#onlyXXX7nominal size 1 and overXXXXXX8Spindlenominal size and#onlyXXXX9nominal size 1 and overXXXXX10CrutchXXXXX11Washer plateXXXXXX12NutXXX13Square headXXXXXXX14Union nuts,compression nuts and tail pipesXXXXXX15Seating washerVulcanized synthetic rubber co
37、mplying with the requirements of clause 6 of BS 3457:197316Head seal“O”-ringRubber complying with the requirements of BS 249417Gland packingSee clause 2418Pinning wire for square headBS 2874,CZ 121 or CZ 122BS 5433:1976 BSI 08-19993Section 3.Workmanship10 CastingsCastings shall be in all respects so
38、und and good,free from laps,blow holes and pitting,and both the external and internal surfaces shall be clean,smooth and free from sand.They shall be neatly dressed and no casting shall be burned,plugged,stopped or patched.11 ForgingsAll forged components shall be sound,solid without laminations,smo
39、oth and well finished and shall comply with the requirements of BS 3885.12 MachiningThe bodies,heads,spindles and other parts shall be truly machined so that,when assembled,the parts are axial and parallel with surfaces smoothly finished with the limits of the size given in the tables applicable to
40、the various components.13 Thickness of partsExcept where there are definite dimensions given which provide for a lesser thickness,no part of any component of a valve shall be of less thickness than that shown in Table 3,line 4.Minimum thicknesses for unions are given in Table 12;see also clause 25.S
41、ection 4.Design and construction14 WaterwayExcept where otherwise stated,the area of waterway throughout the body of a valve shall be not less than the area of a circle of diameter equal to the bore of the seating.The dimensions of the waterway through the unions of a valve shall be not less than th
42、ose stated inTable 12 for the purposes specified in the table,or alternatively if the union ends are for copper tube the dimensions shall be not less than is specified for the appropriate size of union in BS 864-2.Figure 1 Underground stopvalveBS 5433:19764 BSI 08-199915 SeatThe seat of a valve shal
43、l be flat and solid with the body and shall fully support the washer.The bore of the seat shall be rounded to a radius of not less than 0.5 mm and not more than 0.8 mm.The minimum thickness of metal supporting the seat shall be as given in Table 3,line 3.16 Screw threads16.1 General.Unless otherwise
44、 specified,all threads shall be of Whitworth or metric form and right-handed.The external thread on spindles and the corresponding internal thread in heads shall be as detailed in Table 6 and Table 7.All special threads on component parts shall be made to the diameters and pitches specified inTable
45、6 to Table 11 of this standard and shall comply with the requirements of BS 84 so far as it is applicable.16.2 Inlet and outlet.Except where otherwise specified in this standard,inlets and outlets of valves shall:a)for a pipe thread of the same nominal size as the valve,either:1)comply with the requ
46、irements of class B of Table 3M or Table 3 of BS 2779:1973,for external threads;or2)comply with the requirements of Table 4M or Table 4 of BS 2779:1973,for internal threads;orb)for union ends,comply with the dimensions specified in Table 12;orc)either:1)be tapped or screwed(taper pipe thread)to comp
47、ly with the requirements of BS 21;or2)be tapped or screwed to comply with the requirements of BS 61;or3)comply with the requirements of clause 25.16.3 Spindle thread.The length of the spindle thread shall be such that,when the washer plate is resting on the seating without any washer,a length of the
48、 thread equal to not less than 70%of the external diameter of the threaded portion of the spindle shall be in full engagement with the internal thread of the head.16.4 Head thread.The spindle thread in the head(internal)shall be so formed that when the spindle is screwed into the head to its fully o
49、pen position,the end of the spindle projects beyond the face of the head at least 0.8 mm in nominal sizes up to 1 and at least 1.6 mm in larger sizes so that the top of the washer plate shall be clear of the bottom of the head when the valve is fully open.A recess shall be formed at the top of the t
50、hread equal in depth to the depth of thread and in length not greater than the dimensions given in Table 4,line 5.17 Head sealThe head seal shall be as shown in Figure 1,i.e.using toroidal sealing rings and chamfer-type seal,and shall comply with the following requirements.a)The housing dimensions a