1、BRITISH STANDARD BS4742-7: 1989 Hydraulic equipment for agricultural machinery Part7: Specification for port connections for agricultural trailed vehicle hydraulic brake couplings UDC631.372:629.114.2578.4BS4742-7:1989 This British Standard, having been prepared under the directionof the Agricultura
2、l Machinery and Implements Standards Committee, was published under the authorityofthe Board of BSIandcomes intoeffect on 30 June1989 BSI10-1999 The following BSI references relate to the work on this standard: Committee reference AGE/25 Draft for comment87/70154DC ISBN 0 580 16653 8 Committees resp
3、onsible for this British Standard The preparation of this British Standard was entrusted by the Agricultural Machinery and Implements Standards Committee (AGE/-) to Technical Committee AGE/25, upon which the following bodies were represented: AFRC Institute of Engineering Research Agricultural Engin
4、eers Association British Fluid Power Association Local Authority Organizations National Farmers Union Amendments issued since publication Amd. No. Date of issue CommentsBS4742-7:1989 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Dimensi
5、ons 1 4 Performance 1 Figure 1 Hydraulic brake coupling port connections for agricultural trailed vehicles 2 Publications referred to Inside back coverBS4742-7:1989 ii BSI 10-1999 Foreword This Part of BS4742 has been prepared under the direction of the Agricultural Machinery and Implements Standard
6、s Committee. Port connections complying with this standard consist of a bulkhead nut securing a male part selected from the range of coupling sizes given in BS4368-1. The matching female connection has a hose adaptor and an adaptor seal complying with BS5200 to complete the assembly. A British Stand
7、ard 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,
8、an inside front cover, pagesi andii, pages1 and 2, 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.BS4742-7:1989 BSI 10-1999 1 1 Scope This Par
9、t of BS4742 specifies dimensions and performance requirements for the port connections for agricultural trailed vehicle hydraulic brake couplings complying with BS4742-4:1985. NOTEThe titles of the publications referred to in this Part of BS4742 are listed on the inside back cover. 2 Definitions For
10、 the purposes of this part of BS4742, the following definitions apply. 2.1 male part that part of the coupling which is rigidly attached to the tractor (seeBS4742-4) 2.2 female part that part of the coupling which is attached to the trailed vehicle brake hose and which incorporates a device that loc
11、ks the male part (seeBS4742-4) 2.3 hose adaptor a male fitting which connects the female part to the trailed vehicle brake hose. It may be an integral part of the hose assembly or a separate adaptive fitting 2.4 adaptor seal a rubber ring, of rectangular section, between the hose adaptor and the fem
12、ale part 2.5 bulkhead nut a nut which rigidly fixes the male part to the tractor 3 Dimensions The dimensions of the parts of the connection shall be as shown in Figure 1 as follows: 1(a) male part and bulkhead nut; 1(b) female part; 1(c) adaptor seal; 1(d) hose adaptor. 4 Performance When assembled
13、with mating parts, the complete coupling assembly shall comply with the requirements, other than those for dimensions, given in BS4742-4. BS 4742-7:1989 2 BSI 10-1999 NOTEThe term International Rubber Hardness Degrees (IRHD) denotes the hardness scale recommended by the International Organization fo
14、r Standardization (ISO). For substantially elastic isotropic materials, e.g.well vulcanized natural rubbers, the hardness in International Rubber Hardness Degrees bears a known relation to Youngs modulus (seeBS903). Figure 1 Hydraulic brake coupling port connections for agricultural trailed vehicles
15、BS4742-7:1989 BSI 10-1999 Publications referred to BS903, Methods of testing vulcanized rubber. BS3643, ISO metric screw threads. BS3643-1, Principles and basic data. BS3643-2, Specification for selected limits of size. BS4368, Compression couplings for tubes. BS4368-1, Heavy series (metric series).
16、 BS4742, Hydraulic equipment for agricultural machinery. BS4742-2, Specification for hydraulic couplers for general purposes. BS4742-3, Specification for dimensions and pressure rating of single-acting telescopic tipping cylinders for trailers. BS4742-4, Specification for hydraulic couplings on brak
17、ing systems for trailers and trailed equipment. BS4742-5, Specification for dimensions of braking cylinders for trailers and trailed equipment. BS5200, Specification for dimensions of hydraulic connectors and adaptors. ISO1179, Pipe connections for plain end steel and other metal tubes in industrial
18、 applications. ISO5676, Tractors and machinery for agriculture and forestry Hydraulic coupling Braking circuit. BS4742-7: 1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK v
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