BS 5155-1984 蝶阀的设计标准.pdf

BRITISH STANDARD BS 51551984 Incorporating Amendment Nos. 1 and 2 Specification for Butterfly valves UDC 621.646.25 BS 51551984 This 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 on 31 July 1984 BSI 12-1998 First published November 1974 First revision July 1984 The following BSI references relate to the work on this standard Committee reference MEE/191 Draft for comment 81/72473 DC ISBN 0 580 13800 3 Committees responsible for this British Standard The 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 Workers Associated Offices Technical Committee Association of Bronze and Brass Founders Association of Hydraulic Equipment Manufacturers British Chemical Engineering Contractors’ Association British Compressed Gases Association British Gas Corporation British Ship Research Association British Shipbuilders British Valve Manufacturers’ Association Ltd. Copper Development Association Copper Tube Fittings Manufacturers’ Association Council of Ironfoundry Associations Electricity Supply Industry in England and Wales Energy Industries Council Engineering Equipment and Materials Users’ Association GAMBICA General Council of British Shipping Greater London Council Health and Safety cutive Institute of British Foundrymen Institution of Chemical Engineers Institution of Gas Engineers Institution of Mechanical Engineers Institution of Water Engineers and Scientists National Coal Board Society of British Gas Industries STC Water Regulations and Fittings Scheme Steel Casting Research and Trade Association Water Companies Association Coopted members The following body was also represented in the drafting of the standard Institution of Civil Engineers Amendments issued since publication Amd. No.Date of issueComments 5919March 1988 6990May 1992Indicated by a sideline in the margin w w w . b z f x w . c o m BS 51551984 BSI 12-1998i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 1Scope1 2Definitions 1 3Types1 4Nominal size range2 5Nominal and Class pressure designations2 6Pressure/temperature ratings2 7Dimensions and tolerances of body ends3 Section 2. Design and operation 8Design6 9Operation6 Section 3. Materials 10Materials8 Section 4. Testing 11Pressure test requirements9 12Pressure testing9 13Fire type-tested designs9 14Anti-static designs9 15Test certificate9 Section 5. Marking 16General10 17Body marking10 18Body or identification plate marking10 19Material symbols10 Section 6. Preparation for storage and transportation 20General11 21Disk position11 22Body ends11 Section 7. Manufacturer’s certificate 23Manufacturer’s certificate12 Appendix A Ination to be supplied by purchaser13 Appendix B Effect of non-metallic materials on water quality13 Figure 1 Butterfly valve double flanged type1 Figure 2 Butterfly valve single flange wafer type2 Figure 3 Butterfly valve flangeless wafer type2 Figure 4 Butterfly valve U-section wafer type2 Table 1 DN sizes for PN designated valves and nominal pipe sizes for Class designated valves3 Table 2 Pressure/temperature ratings3 Table 3 Pressure/temperature ratings for class 125 cast iron valves3 Table 4 Flange dimensions3 Table 5 Dimensions of Class 125 flanges4 Table 6 Face-to-face dimensions5 Table 7 Tolerances on face-to-face dimensions5 Table 8 Basic materials8 w w w . b z f x w . c o m BS 51551984 ii BSI 12-1998 Page Table 9 Applicability of pressure tests9 Table 10 Maximum permissible seat leakage rates9 Table 11 Table deleted9 Publications referred toInside back cover w w w . b z f x w . c o m BS 51551984 BSI 12-1998iii Foreword This 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 perance 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 options 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 m iv blank w w w . b z f x w . c o m BS 51551984 BSI 12-19981 Section 1. General 1 Scope This 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 s 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 Definitions For the purposes of this British Standard the following definitions apply. 2.1 face-to-face dimensions the 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 i.e. compressed condition 2.2 double flanged a valve having flanged ends for connection to pipe flanges by individual bolting 2.3 wafer a valve primarily intended for clamping between pipe flanges using through bolting NOTESome 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 purposes all equipment of the same nominal size DN designated by the same PN number shall have compatible mating dimensions NOTE 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 dimensions NOTE 1Nominal size is designated by DN followed by a number. NOTE 2This definition is in accordance with ISO 6708. 2.6 tight shut-off valve a valve having no visible leakage past the disk in the closed position under test conditions 2.7 low-leakage-rate valve a valve which has a specified maximum leakage rate past the disk in the closed position 2.8 regulating valve a valve intended for regulating purposes, and which may have a clearance between the disk and the body in the closed position 3 Types Valves 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 type w w w . b z f x w . c o m BS 51551984 2 BSI 12-1998 4 Nominal size range The 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 designations NOTEThe pressure designation required for a valve should be specified by the purchaser in accordance with item c of appendix 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 ratings The 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 type Figure 3 Butterfly valve flangeless wafer type Figure 4 Butterfly valve U-section wafer type w w w . b z f x w . c o m BS 51551984 BSI 12-19983 Table 1 DN sizes for PN designated valves and nominal pipe sizes for Class designated valves Table 2 Pressure/temperature ratings 7 Dimensions and tolerances of body ends 7.1 Double flanged body ends 7.1.1 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 ends 7.2.1 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 valves Table 4 Flange dimensions DNNominal pipe sizes in 4011/2 502 6521/2 803 1004 1255 1506 2008 25010 30012 35014 40016 45018 50020 60024 700 800 900 1 000 1 200 1 400 1 600 1 800 2 000 Nominal/Class pressure designationsPressure/ temperature ratings PN 6, PN 10, PN 16, PN 25, PN 40BS 4504-1 PN 6, PN 10, PN 16, PN 25, PN 40BS 4504-2 Class 150 and Class 300BS 1560-2 Class 125 cast ironTable 3 TemperatureMaximum permissible gauge working pressures for nominal size up to and including 12 in 14 in and above C barabara – 10 to 6613.810.3 9313.19.3 10712.49.0 12112.18.6 13511.78.3 14911.47.6 16310.77.2 17710.36.9 19110.0 2049.7 NOTEIntermediate values may be obtained by linear interpolation. a 1 bar 105 N/m2 102 kPa. Nominal/Class pressure designationsFlange dimensions PN 6, PN 10, PN 16, PN 25, PN 40BS 4504-1 PN 6, PN 10, PN 16, PN 25, PN 40BS 4504-2 Class 150 and Class 300BS 1560-2 Class 125 cast ironTable 5 w w w . b z f x w . c o m BS 51551984 4 BSI 12-1998 Table 5 Dimensions of Class 125 flanges 1234567 Nominal size of valve Diameter of flangeMinimum thickness of flange Diameter of bolt circleNumber of boltsDiameter of bolt holes DNinmmmmmmmmin 4012714.398.4415.9 50215215.9120.6419.0 65a21/2a17817.5139.7419.0 80319019.0152.4419.0 100422923.8190.5819.0 125525423.8215.9822.2 150627925.4241.3822.2 200834328.6298.4822.2 2501040630.2362.01225.41 3001248331.8431.81225.41 3501453334.9476.21228.6 4001659736.5539.81628.6 4501863539.7577.81631.8 5002069842.9635.02031.8 6002481347.6749.32034.9 a 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. 1 1 2⁄ 5 8⁄ 34 ⁄ 34 ⁄ 34 ⁄ 34 ⁄ 7 8 ⁄ 7 8 ⁄ 7 8 ⁄ 1 1 8 ⁄ 1 1 8 ⁄ 1 14 ⁄ 1 14 ⁄ 1 3 8⁄ w w w . b z f x w . c o m BS 51551984 BSI 12-19985 Table 6 Face-to-face dimensions Table 7 Tolerances on face-to-face dimensions 1234567 Nominal sizeDouble flanged short Double flanged long Wafer shortWafer mediumWafer longWafer Face-to-face dimension for nominal pressures not exceeding Face-to-face dimensions for nominal pressures not exceeding PN 25PN 40PN 25PN 25PN 25PN 40 Class 150Class 300Class 150Class 150Class 150Class 300 DNmmmmmmmmmmmm 4010614033 5010815043 6511217046 80114180466449 100127190526456 125140200567064 150140210567670 200152230608971 2501652506811476 3001782707811483 35019029092127127 400216310102140140 450222330114152160 500229350127152170 600267390154178200 700292430229 800318470241 900330510241 1 000410550300 1 200470630350 1 400530710390 1 600600790440 1 800670870490 2 000760950540 NOTEWafer type valves may not be available in all combinations of materials and face-to-face dimensions. Face-to-face dimensionTolerance mmmm Up to and including 200 1 Above 200 up to and including 400 2 Above 400 up to and including 600 3 Above 600 up to and including 800 4 Above 800 5 w w w . b z f x w . c o m BS 51551984 6 BSI 12-1998 Section 2. Design and operation 8 Design 8.1 General. Valves shall be suitable for one or more of the