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BRITISH STANDARDBS 5155:1984Incorporating Amendment Nos.1 and 2Specification forButterfly valvesUDC 621.646.25BS 5155:1984This British Standard,having been prepared under the direction of the Mechanical Engineering Standards Committee,was published under the authority of the Board of BSI and comes into effect on31 July 1984 BSI 12-1998First published November 1974 First revision July 1984The following BSI references relate to the work on this standard:Committee reference MEE/191 Draft for comment 81/72473 DCISBN 0 580 13800 3Committees responsible for this British StandardThe preparation of this British Standard was entrusted by the Mechanical Engineering Standards Committee(MEE/-)to Technical Committee MEE/191 upon which the following bodies were represented:Amalgamated Union of Engineering WorkersAssociated Offices Technical CommitteeAssociation of Bronze and Brass FoundersAssociation of Hydraulic Equipment ManufacturersBritish Chemical Engineering Contractors AssociationBritish Compressed Gases AssociationBritish Gas CorporationBritish Ship Research AssociationBritish ShipbuildersBritish Valve Manufacturers Association Ltd.Copper Development AssociationCopper Tube Fittings Manufacturers AssociationCouncil of Ironfoundry AssociationsElectricity Supply Industry in England and WalesEnergy Industries CouncilEngineering Equipment and Materials Users AssociationGAMBICAGeneral Council of British ShippingGreater London CouncilHealth and Safety ExecutiveInstitute of British FoundrymenInstitution of Chemical EngineersInstitution of Gas EngineersInstitution of Mechanical EngineersInstitution of Water Engineers and ScientistsNational Coal BoardSociety of British Gas IndustriesSTC Water Regulations and Fittings SchemeSteel Casting Research and Trade AssociationWater Companies AssociationCoopted membersThe following body was also represented in the drafting of the standard:Institution of Civil EngineersAmendments issued since publicationAmd.No.Date of issueComments5919March 19886990May 1992Indicated by a sideline in the marginw w w.b z f x w.c o mBS 5155:1984 BSI 12-1998iContentsPageCommittees responsibleInside front coverForewordiiiSection 1.General1Scope12Definitions 13Types14Nominal size range25Nominal and Class pressure designations26Pressure/temperature ratings27Dimensions and tolerances of body ends3Section 2.Design and operation8Design69Operation6Section 3.Materials10Materials8Section 4.Testing11Pressure test requirements912Pressure testing913Fire type-tested designs914Anti-static designs915Test certificate9Section 5.Marking16General1017Body marking1018Body or identification plate marking1019Material symbols10Section 6.Preparation for storage and transportation20General1121Disk position1122Body ends11Section 7.Manufacturers certificate23Manufacturers certificate12Appendix A Information to be supplied by purchaser13Appendix B Effect of non-metallic materials on water quality13Figure 1 Butterfly valve:double flanged type1Figure 2 Butterfly valve:single flange wafer type2Figure 3 Butterfly valve:flangeless wafer type2Figure 4 Butterfly valve:U-section wafer type2Table 1 DN sizes for PN designated valves and nominal pipe sizes for Class designated valves3Table 2 Pressure/temperature ratings3Table 3 Pressure/temperature ratings for class 125 cast iron valves3Table 4 Flange dimensions3Table 5 Dimensions of Class 125 flanges4Table 6 Face-to-face dimensions5Table 7 Tolerances on face-to-face dimensions5Table 8 Basic materials8w w w.b z f x w.c o mBS 5155:1984ii BSI 12-1998PageTable 9 Applicability of pressure tests9Table 10 Maximum permissible seat leakage rates9Table 11 Table deleted9Publications referred toInside back coverw w w.b z f x w.c o mBS 5155:1984 BSI 12-1998iiiForewordThis revision of BS 5155 has been prepared under the direction of the Mechanical Standards Committee.It is one of a series of revised standards for valves that are designed to meet the majority of national requirements and to assist both manufacturers and users.This revision reflects current manufacturing practice,deletes the PN 2.5 pressure designation but extends the pressure range to include Class 300.It supersedes the 1974 edition which is withdrawn.The satisfactory performance of any valve depends on design,manufacture,correct installation and maintenance;this standard specifies requirements for design and manufacture but not installation or maintenance.Guidance on the installation and use of valves is given in BS 6683.This standard does allow options to the standard product,the preferred option being indicated by a note to the appropriate clause.Particular requirements should be indicated by the purchaser,as stated in appendix A,otherwise the manufacturer will supply the product in accordance with the preferred option(s)in respect of the following:a)means of operation;b)direction of operating effort to close;c)trim materials;d)flanged ends drilled.Throughout this standard all pressure ratings specified are gauge pressures.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 obligations.Summary of pages This document comprises a front cover,an inside front cover,pages i to iv,pages 1 to 14,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 inside front cover.w w w.b z f x w.c o mivblankw w w.b z f x w.c o mBS 5155:1984 BSI 12-19981Section 1.General1 ScopeThis British Standard specifies requirements for size,rating,design,materials,marking and preparation for transport and storage for double flanged and wafer type butterfly valves with nominal pressure up to PN 40 and Class 300,in the normal size(DN)range DN 40 to DN 2000 and 11/2 in to 24 in respectively.It also specifies test requirements for pressure testing,fire-tested designs and anti-static designs,and gives methods of test for pressure testing.This standard does not cover the installation of butterfly valves.Strict compliance with the instructions of the manufacturer is necessary.NOTEThe titles of the publications referred to in this standard are listed on the inside back cover.2 DefinitionsFor the purposes of this British Standard the following definitions apply.2.1 face-to-face dimensionsthe distance between the two planes perpendicular to the body axis located at the extremities of the body end ports.Where a liner extends over the end faces and acts as a gasket,the face-to-face dimension is inclusive of the double thickness of the liner(e.g.the thickness over each face)when in the installed(pressed)condition2.2 double flangeda valve having flanged ends for connection to pipe flanges by individual bolting2.3 wafera valve primarily intended for clamping between pipe flanges using through boltingNOTESome types may be suitable for individual bolting(see clause 3).2.4 nominal pressure(PN)nominal pressure(PN)is a numerical designation which is a convenient round number for reference purposesall equipment of the same nominal size(DN)designated by the same PN number shall have compatible mating dimensionsNOTE 1The maximum allowable working pressure depends upon materials,design and working temperatures and shall be selected from the“pressure/temperature rating”tables in the appropriate standards.NOTE 2It is designated by PN followed by the appropriate reference number.NOTE 3This definition is in accordance with ISO 7268.2.5 nominal size(DN)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 convenient round number for reference purposes and is only loosely related to manufacturing dimensionsNOTE 1Nominal size is designated by DN followed by a number.NOTE 2This definition is in accordance with ISO 6708.2.6 tight shut-off valvea valve having no visible leakage past the disk in the closed position under test conditions2.7 low-leakage-rate valvea valve which has a specified maximum leakage rate past the disk in the closed position2.8 regulating valvea valve intended for regulating purposes,and which may have a clearance between the disk and the body in the closed position3 TypesValves shall be one of the following types,as shown in Figure 1 to Figure 4,with metal or resilient seatings or linings:a)double flanged;b)wafer:1)single flange;2)flangeless;3)U-section.NOTEThe type of valve required should be specified by the purchaser in accordance with item a)of appendix A.Figure 1 Butterfly valve:double flanged typew w w.b z f x w.c o mBS 5155:19842 BSI 12-19984 Nominal size rangeThe nominal sizes(DN)for PN designated valves and the nominal pipe sizes for Class designated valves shall be as given in Table 1.NOTEThe valve size required should be specified by the purchaser in accordance with item b)of appendix A.5 Nominal and Class pressure designationsNOTEThe pressure designation required for a valve should be specified by the purchaser in accordance with item c)ofappendix A.5.1 Nominal pressure(PN)designations.The nominal pressure(PN)designations for valves specified by nominal size DN shall be:PN 6,PN 10,PN 16,PN 25,PN 40.5.2 Class pressure designations.The Class pressure designations for valves specified by nominal pipe size shall be:Class 125,Class 150,Class 300.NOTEThe Class designations of valves are numbers representing the primary service values of the valves in lb/in2.6 Pressure/temperature ratingsThe pressure/temperature ratings shall be as given in Table 2 or Table 3 except where restrictions on upper temperature are placed by the manufacturer on valves by reason of valve type,trim materials or other factors.In this case valves shall be marked with the limiting temperature(see item c)of clause 18).NOTEThe service conditions under which a valve is to be used should be specified by the purchaser in accordance with item d)of appendix A.Figure 2 Butterfly valve:single flange wafer typeFigure 3 Butterfly valve:flangeless wafer typeFigure 4 Butterfly valve:U-section wafer typew w w.b z f x w.c o mBS 5155:1984 BSI 12-19983Table 1 DN sizes for PN designated valves and nominal pipe sizes for Class designated valvesTable 2 Pressure/temperature ratings7 Dimensions and tolerances of body ends7.1 Double flanged body ends7.1.1 Dimensions.Flange dimensions shall be as given in Table 4 or Table 5 except where threaded holes are required by the design of the valve(see note 2 of 8.2.1).NOTEFlanges may be supplied undrilled if specified by purchaser(see item e)of appendix A).7.1.2 Face-to-face dimensions.The face-to-face dimensions shall be in accordance with Table 6.NOTEFace-to-face dimensions should be specified by the purchaser in accordance with item f)of appendix A.7.1.3 Tolerances on face-to-face dimensions.Tolerances on face-to-face dimensions shall be in accordance with Table 7.7.2 Wafer body ends7.2.1 Dimensions.Body ends shall be capable of mating with connecting flanges complying with the requirements of 7.1.1.7.2.2 Face-to-face dimensions.The face-to-face dimensions shall be in accordance with Table 6.7.2.3 Tolerances on face-to-face dimensions.Tolerances on face-to-face dimensions shall be in accordance with Table 7.Table 3 Pressure/temperature ratings for Class 125 cast iron valvesTable 4 Flange dimensionsDNNominal pipe sizesin4011/25026521/28031004125515062008250103001235014400164501850020600247008009001 0001 2001 4001 6001 8002 000Nominal/Class pressure designationsPressure/temperature ratingsPN 6,PN 10,PN 16,PN 25,PN 40BS 4504-1PN 6,PN 10,PN 16,PN 25,PN 40BS 4504-2Class 150 and Class 300BS 1560-2Class 125(cast iron)Table 3TemperatureMaximum permissible gauge working pressures for nominal sizeup to and including 12 in14 in and aboveCbarabara 10 to 6613.810.39313.19.310712.49.012112.18.613511.78.314911.47.616310.77.217710.36.919110.02049.7NOTEIntermediate values may be obtained by linear interpolation.a 1 bar=105 N/m2=102 kPa.Nominal/Class pressure designationsFlange dimensionsPN 6,PN 10,PN 16,PN 25,PN 40BS 4504-1PN 6,PN 10,PN 16,PN 25,PN 40BS 4504-2Class 150 and Class 300BS 1560-2Class 125(cast iron)Table 5w w w.b z f x w.c o mBS 5155:19844 BSI 12-1998Table 5 Dimensions of Class 125 flanges1234567Nominal size of valveDiameter of flangeMinimum thickness of flangeDiameter of bolt circleNumber of boltsDiameter of bolt holesDNinmmmmmmmmin4012714.398.4415.950215215.9120.6419.0(65)a(21/2)a17817.5139.7419.080319019.0152.4419.0100422923.8190.5819.0125525423.8215.9822.2150627925.4241.3822.2200834328.6298.4822.22501040630.2362.01225.413001248331.8431.81225.413501453334.9476.21228.64001659736.5539.81628.64501863539.7577.81631.85002069842.9635.02031.86002481347.6749.32034.9a This size has been retained only for the purpose of replacing existing valves.Its use for new construction on piping systems using BS 1560-2 flanges should be avoided.1125834343434787878118118114114138w w w.b z f x w.c o mBS 5155:1984 BSI 12-19985Table 6 Face-to-face dimensionsTable 7 Tolerances on face-to-face dimensions1234567Nominal sizeDouble flanged shortDouble flanged longWafer shortWafer mediumWafer longWaferFace-to-face dimension for nominal pressures not exceedingFace-to-face dimensions for nominal pressures not exceedingPN 25PN 40PN 25PN 25PN 25PN 40Class 150Class 300Class 150Class 150Class 150Class 300DNmmmmmmmmmmmm4010614033501081504365112170468011418046644910012719052645612514020056706415014021056767020015223060897125016525068114763001782707811483350190290921271274002163101021401404502223301141521605002293501271521706002673901541782007002924302298003184702419003305102411 0004105503001 2004706303501 4005307103901 6006007904401 8006708704902 000760950540NOTEWafer type valves may not be available in all combinations of materials and face-to-face dimensions.Face-to-face dimensionTolerancemmmmUp to and including 200 1Above 200 up to and including 400 2Above 400 up to and including 600 3Above 600 up to and including 800 4Above 800 5w w w.b z f x w.c o mBS 5155:19846 BSI 12-1998Section 2.Design and operation8 Design8.1 General.Valves shall be suitable for one or more of the following service applications:a)tight shut-off;b)low leakage rate;c)regulating.Valves designed for a preferred direction of flow shall be so indicated.NOTE 1The intended service application should be specified by the purchaser in accordance with item g)of appendix A.NOTE 2Where valves are to be used under vacuum conditions this should be specified by the purchaser.8.2 Bodies8.2.1 Double flanged valves.End flanges of double flanged steel valves shall be cast or forged integral with the body.Flanges attached by butt-welding shall be welded in accordance with BS 2633 or BS 4677.NOTE 1Flange attachment by other welding procedures is outside the scope of this standard.NOTE 2Threaded holes in the flange may be used where required by the d