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1、BRITISH STANDARD BS ISO 8434-2:2007 Metallic tube connections for fluid power and general use Part 2: 37 flared connectors ICS 23.100.40 ? Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 8434-2:2007 This
2、 British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2007 BSI 2007 ISBN 978 0 580 55036 2 National foreword This British Standard is the UK implementation of ISO 8434-2:2007. It supersedes BS ISO 8434-2:1994 which is withdrawn. The UK part
3、icipation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Panel MCE/18/-/4, Connectors and associated components. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purpor
4、t to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London
5、South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO 8434-2:2007(E) INTERNATIONAL STANDARD ISO 8434-2 Second edition 2007-09-01 Metallic tube connections for fluid power and general use Part 2: 37 flared connectors Raccordements de tubes mtalliqu
6、es pour transmissions hydrauliques et pneumatiques et applications gnrales Partie 2: Connecteurs vass 37 BS ISO 8434-2:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank Un
7、iversity, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 3 4 Requirements for materials . 4 5 Pressure/temperature requirements. 5 6 Designation o
8、f connectors 5 7 Requirements for tubes 8 8 Across flats dimensions and tolerances 9 9 Design 10 10 Screw threads . 10 11 Manufacture. 11 12 Assembly instructions . 12 13 Procurement information. 12 14 Marking of components . 12 15 Performance and qualification test. 12 16 Identification statement (
9、reference to this part of ISO 8434). 14 Annex A (normative) Length reduction factors for reducing connectors 42 Bibliography. 50 BS ISO 8434-2:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iv Foreword IS
10、O (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical co
11、mmittee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electro
12、technical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the me
13、mber bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identif
14、ying any or all such patent rights. ISO 8434-2 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 4, Connectors and similar products and components. This second edition cancels and replaces the first edition (ISO 8434-2:1994), which has been technically revised. ISO
15、 8434 consists of the following parts, under the general title Metallic tube connections for fluid power and general use: Part 1: 24 cone connectors Part 2: 37 flared connectors Part 3: O-ring face seal connectors Part 4: 24 cone connectors with O-ring weld-on nipple Part 6: 60 cone connectors with
16、or without O-ring sealing BS ISO 8434-2:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI v Introduction In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pres
17、sure within an enclosed circuit. In general applications, a fluid may be conveyed under pressure. Components may be connected through their ports by connections (connectors), tubes and hoses. Tubes are rigid conductors; hoses are flexible conductors. This part of ISO 8434 is based on the US standard
18、 ANSI/SAE J514 1. The threads for the 37 flared connection are unified inch threads in accordance with ISO 263. The inch threads were not changed to metric threads according to ISO 261 to allow connectors complying with this International Standard to be used in existing applications without requirin
19、g a change to tube or hose assemblies. Also, the thread-to-nut overtorque and seal performance have been extensively tested; to change to metric threads would require an extensive test program at considerable cost without providing any functional improvement. The threads are integral to themselves,
20、connectors of this type match only to themselves and, other than having metric threads, no value in changing could be found. Major international companies that have used these connectors have adopted the design without noting any problems. All wrench flats specified in this part of ISO 8434 are dime
21、nsioned to be used with ISO standard metric wrenches. BS ISO 8434-2:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Fri Nov
22、16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Metallic tube connections for fluid power and general use Part 2: 37 flared connectors 1 Scope This part of ISO 8434 specifies general and dimensional requirements for the design and performance of 37 flared connectors that are suitable for us
23、e with ferrous and non-ferrous tubes with outside diameters from 6 mm to 50,8 mm, inclusive. These connectors are for use in fluid power and general applications within the limits of pressure and temperature specified in this part of ISO 8434. They are intended for the connection of tubes and hose f
24、ittings to ports in accordance with ISO 6149-1, ISO 1179-1, ISO 9974-1 and ISO 11926-1. (See ISO 12151-5 for related hose fitting specification.) These connectors provide full-flow connections with metal-to-metal sealing in hydraulic systems operating to the working pressures shown in Table 1. Becau
25、se many factors influence the pressure at which a system performs satisfactorily, these values shall not be understood as guaranteed minimums. For every application, sufficient testing will need to be conducted and the results reviewed by both the user and manufacturer to ensure that required perfor
26、mance levels are met. NOTE 1 For new designs in hydraulic fluid power applications, see the requirements given in 9.6. Where the requirements of the application allow for the use of elastomeric seals, connector designs that conform to International Standards and incorporate elastomeric sealing are p
27、referred. NOTE 2 For use under conditions outside the pressure and/or temperature limits specified, see 5.5. Both metric and inch tubing can be accommodated by changing the sleeve (see Figure 7). In the past, these connectors have been used predominantly with inch tubing. For new and future designs,
28、 the use of metric tubing is preferred. This part of ISO 8434 also specifies a performance and qualification test for 37 flared connectors. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited a
29、pplies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 68-2, ISO general-purpose screw threads Basic profile Part 2: Inch screw threads ISO 228-1:2000, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensio
30、ns, tolerances and designation ISO 261, ISO general purpose metric screw threads General plan ISO 263, ISO inch screw threads General plan and selection for screws, bolts and nuts Diameter range 0.06 to 6 in BS ISO 8434-2:2007 Licensed Copy: London South Bank University, London South Bank University
31、, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 2 ISO 1127, Stainless steel tubes Dimensions, tolerances and conventional masses per unit length ISO 1179-11), Connections for general use and fluid power Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal se
32、aling Part 1: Threaded ports ISO 1179-2:1), Connections for general use and fluid power Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing Part 2: Heavy-duty (S series) and light-duty (L series) stud ends with elastomeric sealing (type E) ISO 1179-3:1), Connections
33、 for general use and fluid power Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing Part 3: Light-duty (L series) stud ends with sealing by O-ring with retaining ring (types G and H) ISO 1179-4:1), Connections for general use and fluid power Ports and stud ends wit
34、h ISO 228-1 threads with elastomeric or metal-to-metal sealing Part 4: Stud ends for general use only with metal-to-metal sealing (type B) ISO 3304, Plain end seamless precision steel tubes Technical conditions for delivery ISO 3305, Plain end welded precision steel tubes Technical conditions for de
35、livery ISO 4759-1:2000, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and C ISO 5598, Fluid power systems and components Vocabulary ISO 5864:1993, ISO inch screw threads Allowances and tolerances ISO 6149-1, Connections for hydraulic fluid power and general use P
36、orts and stud ends with ISO 261 metric threads and O-ring sealing Part 1: Port with truncated housing for O-ring seal ISO 6149-3, Connections for hydraulic fluid power and general use Ports and stud ends with ISO 261 metric threads and O-ring sealing Part 3: Dimensions, design, test methods and requ
37、irements for light duty (L series) stud ends ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests ISO 9974-1, Connections for general use and fluid power Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing Part 1: Threaded ports ISO 9974-2, Connections
38、 for general use and fluid power Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing Part 2: Stud ends with elastomeric sealing (type E) ISO 9974-3:1996, Connections for general use and fluid power Ports and stud ends with ISO 261 threads with elastomeric or metal-to-
39、metal sealing Part 3: Stud ends with metal-to-metal sealing (type B) ISO 10763, Hydraulic fluid power Plain-end seamless and welded precision steel tubes Dimensions and nominal working pressures ISO 11926-1, Connections for general use and fluid power Ports and stud ends with ISO 725 threads and O-r
40、ing sealing Part 1: Ports with O-ring seal in truncated housing ISO 11926-3:1995, Connections for general use and fluid power Ports and stud ends with ISO 725 threads and O-ring sealing Part 3: Light-duty (L series) stud ends 1) To be published. (Revision of ISO 1179:1981) BS ISO 8434-2:2007 License
41、d Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 ISO 19879, Metallic tube connections for fluid power and general use Test methods for hydraulic fluid power connections 3 Terms and definitions For the purposes of thi
42、s document, the terms and definitions given in ISO 5598 and the following apply. 3.1 adjustable stud end stud end connector that allows for connector orientation through final tightening of the locknut to complete the connection NOTE This type of stud end is typically used on shaped connectors (e.g.
43、 tees, crosses and elbows). 3.2 non-adjustable stud end stud end connector that does not require specific orientation before final tightening of the connection because it is only used on straight connectors 3.3 fluid power means whereby energy is transmitted, controlled and distributed using a press
44、urized fluid as the medium ISO 5598 3.4 connector connection leakproof device to connect pipelines (conductors) to one another, or to equipment 3.5 fastening thread terminal thread of a complete connector 3.6 run two principal, axially aligned outlets of a tee or cross 3.7 branch side outlet(s) of a
45、 tee or cross 3.8 chamfer removal of a conical portion at the entrance of a thread to assist assembly and prevent damage to the start of the thread 3.9 assembly torque torque to be applied in order to achieve a satisfactory final assembly 3.10 working pressure pressure at which the apparatus is bein
46、g operated in a given application 3.11 face-to-face dimension distance between the two parallel faces of axially aligned outlets of a connector BS ISO 8434-2:2007 Licensed Copy: London South Bank University, London South Bank University, Fri Nov 16 07:28:01 GMT+00:00 2007, Uncontrolled Copy, (c) BSI
47、 4 3.12 face-to-centre dimension distance from the face of an outlet to the central axis of an angularly disposed outlet 4 Requirements for materials 4.1 General Figure 1 shows the cross-section and components of a typical 37 flared connector. Key 1 straight stud connector body 2 tube nut 3 tube 4 s
48、leeve 5 O-ring a Stud end in accordance with ISO 1179-3, ISO 6149-3, ISO 9974-2 or ISO 11926-3. Figure 1 Cross-section of typical 37 flared connection 4.2 Connector bodies Bodies shall be manufactured from carbon steel, stainless steels or copper alloys, which will provide the minimum requirements f
49、or the pressure/temperature ratings specified in Clause 5 when tested in accordance with Clause 15. They shall have characteristics that make them suitable for use with the fluid to be conveyed and to provide an effective joint. 4.3 Nuts Nuts to be used with carbon steel bodies shall be made of carbon steel and those for use with stainless steel bodies shall be made of stainless steel