1、BRITISH STANDARD BS 7504:1995 ISO 6164:1994 Hydraulic fluid power Four-screw, one-piece square-flange connections for use at pressures of 25 MPa and 40 MPa (250 bar and 400 bar)BS7504:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published un
2、derthe authority of the Standards Board and comes intoeffect on 15March1995 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference MCE/18 Draft for comment 84/76644 DC ISBN 0 580 23860 1 Committees responsible for this British Standard The preparation of th
3、is British Standard was entrusted to Technical Committee MCE/18, Fluid power systems and components, upon which the following bodies were represented: Association of British Mining Equipment Companies British Compressed Air Society British Fluid Power Association British Hydromechanics Research Asso
4、ciation British Steel Industry Department of Trade and Industry (National Engineering Laboratory) Ministry of Defence University of Bath The following bodies were also represented in the drafting of the standard through a subcommittee: British Industrial Truck Association Engineering Equipment and M
5、aterials Users Association Amendments issued since publication Amd. No. Date CommentsBS7504:1995 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Material 1 5 Dimensions 1 6 Finish 1 7 Ident
6、ification statement 2 Annex A (informative) Equivalent SAE O-rings 9 Annex B (informative) Bibliography 9 Figure 1 Dimensions of flanged joint and flanged connection assemblies 25MPa and 40MPa (250 bar and 400 bar) series 2 Figure 2 Dimensions of flanges 25 MPa and 40 MPa (250 bar and 400 bar) serie
7、s 4 Figure 3 Port dimensions for flange connections 5 Figure 4 O-ring 7 Figure 5 Flange head with and without groove for O-rings 7 Table 1 Dimensions of flanged joint and flanged connection assemblies 25MPa (250 bar) series 3 Table 2 Dimensions of flanged joint and flanged connection assemblies 40 M
8、Pa (400 bar) series 3 Table 3 Dimensions of flanges 25 MPa (250 bar) series 6 Table 4 Dimensions of flanges 40 MPa (400 bar) series 6 Table 5 Dimensions of flange heads for flanges 25 MPa (250 bar) series 8 Table 6 Dimensions of flange heads for flanges 40 MPa (400 bar) series 8 Table A.1 Untitled 9
9、 List of references Inside back coverBS7504:1995 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical CommitteeMCE/18. It is identical with ISO6164:1994 Hydraulic fluid power Four-screw, one-piece square-flange connections for use at pressures of25MPa and40 MPa(25 ba
10、r to400 bar) published by the International Organization for Standardization. The Technical Committee has reviewed the provisions of ISO273:1979, ISO630:1980, ISO898-1:1988, ISO898-2:1992, ISO2768-1:1989, ISO3601-1:1988 and ISO5598:1985 to which normative reference is made in the text and has decide
11、d that they are acceptable for use in conjunction with this standard. 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 immu
12、nity from legal obligations. Cross-references International standard Corresponding British Standard BS 3643 ISO metric screw threads ISO 261:1973 ISO 724:1993 Part 1:1981 Principles and basic data (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover,
13、 pages i and ii, pages1 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 amendment table on the inside front cover.BS7504:1995 BSI 08-1999 1 Introduction In hydraulic fluid power
14、systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Components are interconnected through their ports and associated fluid conductor fitting ends. 1 Scope This International Standard gives complete general and dimensional specifications for four-s
15、crew, one-piece square-flange connections for use at pressures of25MPa and40MPa(250 bar 1)and400bar). For flange connections, a design factor of2,5is valid, not including weld joints, for which special instructions exist. This International Standard also specifies the dimensions of the seals to be u
16、sed, as well as the grooves to house the seals. These connections are intended for application in hydraulic systems, on industrial and commercial products, where it is desired to avoid the use of threaded connections. Surges of pressure higher than the nominal ratings will reduce the ability of the
17、flange connections to retain the hydraulic fluid and this should be taken into account in the design of the hydraulic system. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of
18、publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain r
19、egisters of currently valid International Standards. ISO 261:1973, ISO general purpose metric screw threads General plan. ISO 273:1979, Fasteners Clearance holes for bolts and screws. ISO 630:1980, Structural steels. ISO 724:1993, ISO general-purpose metric screw threads Basic dimensions. ISO 898-1:
20、1988, Mechanical properties of fasteners Part 1: Bolts, screws and studs. ISO 898-2:1992, Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread. ISO 2768-1:1989, General tolerances Part1:Tolerances for linear and angular dimensions without individual toleranc
21、e indications. ISO 3601-1:1988, Fluid systems Sealing devices O-rings Part 1: Inside diameters, cross-sections, tolerances and size identification code. ISO 5598:1985, Fluid power systems and components Vocabulary. 3 Definitions For the purposes of this International Standard, the definitions given
22、in ISO5598 apply. 4 Material 4.1 Use screws of property class8.8 or10.9, as specified in ISO898-1. 4.2 Use nuts of property class10, as specified in ISO898-2. 4.3 Use flanges made of Fe510C steel or steel with minimum equivalent mechanical characteristics (structural steel in accordance with ISO630)
23、. 4.4 Use flange heads made of Fe360C steel or weldable steel with minimum equivalent mechanical characteristics (structural steel in accordance with ISO630). 5 Dimensions 5.1 For dimensions of the flanged joint and flanged connection assemblies, seeFigure 1 andTable 1 andTable 2. 5.2 Select square
24、flanges in accordance with Figure 2 and Figure 3, andTable 3 andTable 4. 5.3 Select flange heads in accordance withFigure 5 and Table 5 andTable 6. 5.4 Select seals and housing grooves in accordance withFigure 4 andFigure 5, andTable 5 and Table 6. NOTE 1Flange heads with seals can house O-rings or
25、other seals that fit the same groove. NOTE 2Flange heads without seals are used in conjunction with tubing, connected to a flange head with a seal. 6 Finish Refer toFigure 2 andFigure 5 for specific finish requirements. 1) 1 bar = 0,1 MPa = 10 5Pa; 1 Pa = 1 N/m 2BS7504:1995 2 BSI 08-1999 7 Identific
26、ation statement (Reference to this International Standard) Use the following statement in test reports, catalogues and sales literature when electing to comply with this International Standard: “Four-screw, one-piece square-flange connections in accordance with ISO6164:1994, Hydraulic fluid power Fo
27、ur-screw, one-piece square-flange connections for use at pressures of25MPa and40MPa(250bar and400bar).” Figure 1 Dimensions of flanged joint and flanged connection assemblies 25MPa and40MPa (250 bar and400 bar) series (seeTable 1 andTable 2)BS7504:1995 BSI 08-1999 3 Table 1 Dimensions of flanged joi
28、nt and flanged connection assemblies 25 MPa (250bar) series Table 2 Dimensions of flanged joint and flanged connection assemblies 40 MPa (400 bar) series Dimensions in millimetres Nominal flange size O-ring a Screw Thread length d Screw torque b DN d 1 c l 1 d l 2 d t 1 d min. Nm 10 13 19 25 32 17 2
29、,65 19 3,55 25 3,55 32,5 3,55 37,5 3,55 M6 1 M8 1,25 M8 1,25 M10 1,5 M12 1,75 45 50 55 65 75 30 35 35 40 50 12,5 15,5 13,5 15,5 20,5 10 25 25 53 95 38 51 56 63 47,5 3,55 56 3,55 69 3,55 85 3,55 M16 2 M16 2 M20 2,5 M20 2,5 90 100 110 120 60 65 80 90 24,5 25,5 33 33 220 220 390 390 a See ISO 3601-1. (
30、Annex A gives the equivalent SAE O-rings.) b These torque values are only a guide when using lubricated screws of property class8.8, as specified in ISO898-1, calculated with a coefficient of friction of0,2. Net tightening torque depends on many factors, including lubrication, coating and surface fi
31、nish. When flange head screws of property class10.9 or class10.9 screws with heat-treated washers are used to increase the design factor, the recommended torque values may be increased by25%. CAUTION It is important that all screws be lightly torqued before applying the final recommended torque valu
32、es to avoid breaking the flange during installation. c Thread in accordance with ISO724, with coarse pitch in accordance with ISO261. d Recommended dimensions. Screw lengths are calculated for steel; use of other materials may require different screw lengths. Dimensions in millimetres Nominal flange
33、 size O-ring a Screw Thread length d Screw torque b DN d 1 c l 1 d l 2 d t 1 d min. Nm 10 13 19 25 32 17 2,65 19 3,55 25 3,55 32,5 3,55 37,5 3,55 M6 1 M8 1,25 M8 1,25 M10 1,5 M12 1,75 45 50 55 65 75 30 35 35 40 50 12,5 15,5 13,5 15,5 20,5 10 25 25 53 95 38 51 56 63 70 47,5 3,55 56 5,3 69 5,3 75 5,3
34、85 5,3 M16 2 M16 2 M20 2,5 M24 3 M24 3 90 100 130 130 150 60 65 80 90 100 24,5 25,5 31 37,5 38,5 220 220 390 800 800 80 87,5 5,3 M30 3,5 170 120 48,5 1 600 a See ISO 3601-1. (Annex A gives the equivalent SAE O-rings.) b These torque values are only a guide when using lubricated screws of property cl
35、ass8.8, as specified in ISO898-1, calculated with a coefficient of friction of0,2. Net tightening torque depends on many factors, including lubrication, coating and surface finish. When flange head screws of property class10.9 or class10.9 screws with heat-treated washers are used to increase the de
36、sign factor, the recommended torque values may be increased by25%. CAUTION It is important that all screws be lightly torqued before applying the final recommended torque values to avoid breaking the flange during installation. c Thread in accordance with ISO724, with coarse pitch in accordance with
37、 ISO261. d Recommended dimensions. Screw lengths are calculated for steel; use of other materials may require different screw lengths.BS7504:1995 4 BSI 08-1999 Figure 2 Dimensions of flanges 25 MPa and 40 MPa (250 bar and 400 bar) series (seeTable 3 andTable 4)BS7504:1995 BSI 08-1999 5 Figure 3 Port
38、 dimensions for flange connections (seeTable 3 andTable 4)BS7504:1995 6 BSI 08-1999 Table 3 Dimensions of flanges 25 MPa (250 bar) series Table 4 Dimensions of flanges 40 MPa (400 bar) series Dimensions in millimetres Nominal flange size AA a c d 8 d 9 b d 14 e g j l 5 c r d DN H12 H13 H11 0,2 max.
39、10 13 19 25 32 43 48 53 68 80 24,7 29,7 35,4 43,8 51,6 25 31 38,9 45,3 51,6 6,6 9 9 11 13,5 18,5 24,3 32,2 38,5 43,7 35 42 50 62 73 6,2 6,2 6,2 7,5 7,5 40 45 50 65 75 18 20 22 25 30 6 8 8 10 12 38 51 56 63 95 105 125 145 60,1 69,3 83,4 102,5 61,1 72,3 88 102,3 17,5 17,5 22 22 50,8 62,8 76,6 90,8 85
40、98 118 145 7,5 9 9 9 90 100 120 140 36 40 45 52 14 16 20 20 a Recommended dimensions. b In accordance with ISO 273, medium series. c The upper face of the flange may have any form. However, the supporting face of the screw heads shall be compatible with dimensions g and l 5 . The upper part of the f
41、langes shall not restrict the welding. Tolerances shall be in accordance with ISO2768-1, tolerance class m. d Optional. Dimensions in millimetres Nominal flange size AA a c d 8 d 9 b d 14 e g j l 5 c r d DN H12 H13 H11 0,2 max. 10 13 19 25 32 43 48 53 68 80 24,7 29,7 35,4 43,8 51,6 26,4 32,6 42,1 48
42、,4 54,8 6,6 9 9 11 13,5 18,5 24,7 32,5 38,9 44,6 35 42 50 62 73 7,2 7,2 8,2 9 9,8 40 45 50 65 75 18 20 22 25 30 6 8 8 10 12 38 51 56 63 70 95 105 125 155 165 60,1 69,3 83,4 102,5 113,1 64,3 80,2 95 111 120 17,5 17,5 22 26 26 51,6 67,6 80,5 90,5 102,5 85 98 118 145 160 12 12 16,1 16,1 17,5 90 100 120
43、 150 160 36 40 50 52 60 14 16 20 20 20 80 185 123,7 136 33 114,5 175 21 180 70 24 a Recommended dimensions. b In accordance with ISO 273, medium series. c The upper face of the flange may have any form. However, the supporting face of the screw heads shall be compatible with dimensions g and l 5 . T
44、he upper part of the flanges shall not restrict the welding. Tolerances shall be in accordance with ISO2768-1, tolerance class m. d Optional. 0 025 , 0 025 , BS7504:1995 BSI 08-1999 7 Figure 4 O-ring (seeTable 5 andTable 6) Figure 5 Flange head with and without groove for O-rings (seeTable 5 andTabl
45、e 6)BS7504:1995 8 BSI 08-1999 Table 5 Dimensions of flange heads for flanges25 MPa (250 bar) series Table 6 Dimensions of flange heads for flanges 40 MPa (400 bar) series Dimensions in millimetres Nominal flange size DN d 5 O-ring b d 2 d 3 d 7 d 10 h m n s 1 0,25 max. max. max. min. 0,25 0,15 nom.
46、nom. 10 13 19 25 32 3,2 4,2 4,2 4,2 4,2 18 24 31,5 38 43 12,5 15 20 25 32 22,05 25,65 31,75 39,25 44,15 21,90 25,50 31,60 39,10 44,00 24,5 30,2 38,1 44,5 50,8 14 16 22 27 34 6,8 6,8 6,8 8 8 17 19 25 32,5 37,5 2,65 3,55 3,55 3,55 3,55 2,2 2,9 2,9 2,9 2,9 38 51 56 63 4,2 4,2 4,2 4,2 50 62 76 90 38 47
47、58 70 53,9 62,7 75,5 91,3 53,7 62,5 75,3 91,1 60,4 71,4 87,2 101,6 40 50 60 74 8 9,6 12 15 47,5 56 69 85 3,55 3,55 3,55 3,55 2,9 2,9 2,9 2,9 Dimensions in millimetres Nominal flange size DN d 5 O-ring b d 2 d 3 d 7 d 10 h m n s 1 0,25 max. max. max. min. 0,25 0,15 nom. nom. 10 13 19 25 32 3,2 4,2 4,
48、2 4,2 4,2 18 24 32 38 44 11 14 18 22 29 22,05 25,65 31,75 39,25 44,15 21,90 25,50 31,60 39,10 44,00 26 31,8 41,3 47,6 54 13 15 19 24 32 7,8 7,8 8,8 9,5 10,3 17 19 25 32,5 37,5 2,65 3,55 3,55 3,55 3,55 2,2 2,9 2,9 2,9 2,9 38 51 56 63 70 4,2 6,7 6,7 6,7 6,7 51 67 80 90 102 35 43 53 58 63 53,9 65,7 78,
49、5 84,8 94,6 53,7 65,5 78,6 84,6 94,4 63,5 79,4 94,2 104 119 38 46 56 59 65 12,6 12,6 16,5 18 20 47,5 56 69 75 85 3,55 5,3 5,3 5,3 5,3 2,9 4 4 4 4 80 6,7 114 74 97,0 96,8 131 76 23,5 87,5 5,3 4 0 0 1 , 0 0 1 , BS7504:1995 BSI 08-1999 9 Annex A (informative) Equivalent SAE 2)O-rings Table A.1 gives a list of O-rings conforming to SAEJ120 that are equivalent to
