【阀门标准】BS 1968-1953 Specification for floats for ballvalves (copper).pdf
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1、BRITISH STANDARDBS 1968:1953Incorporating Amendment Nos.1 and 2Specification forFloats for ballvalves(copper)CONFIRMED DECEMBER 2007BS 1968:1953This British Standard,having been approved by the Sanitary Appliances Industry Standards Committee and endorsed by the Chairman of the Building Divisional C
2、ouncil,was published under the authority of the General Council on 8 May 1953 BSI 10-1999ISBN 0 580 35579 9Co-operating organizationsThe Sanitary Appliances Industry Standards Committee,under whose supervision this British Standard was prepared,consists of representatives from the following Governme
3、nt departments and scientific and industrial organizations:AdmiraltyMetal Sink Manufacturers AssociationBritish Bath Manufacturers AssociationMinistry of Housing and Local Government*British Ironfounders Association*Ministry of Works*British Plastics FederationNational Brassfoundry Association*Briti
4、sh Sanitary Earthenware ManufacturersNational Federation of Building TradesAssociationEmployersBritish Sanitary Fireclay AssociationNational General Export Merchants GroupBritish Waterworks Association*Royal Institute of British Architects*D.S.I.R.Building Research Station*Royal Institute of Charter
5、ed SurveyorsFlushing Cistern Makers Association*Royal Sanitary Institute*Institute of Plumbers*Sanitary Inspectors AssociationInstitution of Municipal Engineers*Scottish Federation of Plumbers and DomesticInstitution of Sanitary EngineersEngineers(Employers)AssociationsLondon County CouncilWater Com
6、panies Association*The Government departments and scientific and industrial organizations marked with an asterisk in the above list,together with the following,were directly represented on the committee entrusted with the preparation of this British Standard:Associated Master Plumbers and DomesticCr
7、own Agents for the ColoniesEngineersDistributors of Builders Supplies Joint CouncilAssociation of Heating,Ventilating andElectric Water Heater ManufacturersDomestic Engineering EmployersAssociationBritish Electrical Development AssociationInstitute of British FoundrymenBritish Electrical and Allied
8、ManufacturersInstitution of Gas EngineersAssociationInstitution of Heating and VentilatingBritish Non-Ferrous Metals ResearchEngineersAssociationInstitution of Water EngineersBuilding Industries National CouncilLondon Chamber of CommerceB.W.A.Licensees AssociationMetropolitan Water BoardCopper Ball
9、Manufacturers AssociationSociety of British Gas IndustriesCopper Tube Fittings ManufacturersUrban District Councils AssociationAssociationAmendments issued since publicationAmd.No.Date of issueComments3220November 19584667September 1962Indicated by a sideline in the marginw w w.b z f x w.c o mBS 196
10、8:1953 BSI 10-1999iContentsPageCo-operating organizationsInside front coverForewordii1Scope12Definitions13General14Materials15Jointing of copper floats16Floats other than spherical27Bosses and fitments28Tolerances29Tests210Marking2Appendix Information to be supplied by the purchaser3Table 1 Spherica
11、l copper floats4Table 2 Classification of bosses for use withclasses A,B and C floats5Table 3a Bosses for classes A and C floats withsoldered and brazed joints6Table 3b Bosses for class B floats with solderless joints7Table 4 Weight of boss for classes A and C floats andof boss and fitments for clas
12、s B floats8Table 5 Assembled weight of spherical copper floatsincluding solder or other jointing material8w w w.b z f x w.c o mBS 1968:1953ii BSI 10-1999ForewordThis standard makes reference to the following British Standards:BS 84,Screw threads of Whitworth form.BS 218,Brass bars and sections(suita
13、ble for forging)and drop forgings.BS 219,Soft solders.BS 427,Tables of diamond pyramid hardness numbers.BS 899,Cold rolled copper sheets and strip(half-hard and annealed)for general purposes.BS 1212,Ballvalves(“Portsmouth”type)excluding floats.BS 1400,Copper alloy ingots and castings.BS 1845,Filler
14、alloys for brazing(silver solders and brazing solders).This British Standard specifies requirements for copper floats for use with ballvalves and has been issued to facilitate the manufacture as separate items,to be purchasable as such of floats suitable for ballvalves complying with the requirement
15、s of BS 1212,“Ballvalves(“Portsmouth”type)”and other types of ballvalve requiring floats of this description.Reference should be made to BS 1212 for permissible alternative types of float for use with ballvalves complying with that specification.For information regarding the correct size of float to
16、 use for a particular size of ballvalve,or range of pressure,where the leverage exerted is not less than that specified in BS 1212,reference should be made to Table 2 of this standard and also to BS 1212.A British Standard does not purport to include all the necessary provisions of a contract.Users
17、of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover,an inside front cover,pages i and ii,pages 1 to 8,an inside back cover and a back cove
18、r.This standard has been updated(see copyright date)and may have had amendments incorporated.This will be indicated in the amendment table on the inside front cover.w w w.b z f x w.c o mBS 1968:1953 BSI 10-199911 ScopeThis British Standard specifies requirements for a range of spherical copper float
19、sof 41/2,5,6,7,8,9,10,11 and 12 inches nominal diameter suitable for attachment to the ballvalves specified in BS 1212 and to ballvalves the leverage of which for the same bore of seat is not less than that specified in BS 1212,in the following classes:Class A.Floats of all sizes with soldered joint
20、s.Class B.Floats of all sizes with solderless joints.Class C.Floats of all sizes with brazed,welded or silver-soldered joints.Performance requirements relating to floats of a shape other than spherical are also included.2 DefinitionsFor the purposes of this British Standard the following definitions
21、 shall apply:2.1 volumethe volume of water in cubic inches,taken to the nearest cubic inch,displaced when the shell(float with no boss)is completely immersed2.2 free-floating,volumethe volume of water in cubic inches,taken to the nearest cubic inch,displaced when the shell(float with no boss)is rest
22、ing on water2.3 useful volumehalf the volume(see definition 2.1 above)less the free-floating volume(see definition 2.2 above)taken to the nearest cubic inch2.4 lifting effortthe useful volume(see definition 2.3 above)converted into weight in pounds at the rate of 0.036 lb.per cubic inch(Shown calcul
23、ated in Table 1 for the minimum weight of shell.)2.5 maximum immersed operating depththe point at which the volume(see definition 2.1 above)is equally above and below the surface of the water2.6 diameter of spherical floatsthe average outside diameter of the shell measured at two axes at right angle
24、s to each other and clear of the jointing seam3 GeneralThe shells of copper floats shall comply with the requirements of Clauses 4,5,6,8,9 and 10,and shall be of the dimensions and weights given in Table 1.They shall be fitted with bosses complying with the requirements of Clause 7 and Table 2,Table
25、 3a,Table 3b and Table 4.The complete float shall comply with the weight requirements ofTable 5 and shall not be artificially loaded for this purpose.After manufacture,the copper used for floats shall be left in a planished,condition and shall have a minimum Vickers hardness(HV)of 70 at any one poin
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