1、BRITISH STANDARD BS ISO 7789:2007 Hydraulic fluid power Two-, three- and four-port screw-in cartridge valves Cavities ICS 23.100.50 BS ISO 7789:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2008 BSI 2008 ISBN 978 0 580 55037
2、 9 National foreword This British Standard is the UK implementation of ISO 7789:2007. It supersedes BS ISO 7789:1998 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Panel MCE/18/-/5, Control components. A
3、 list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport 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
4、 legal obligations. Amendments/corrigenda issued since publication Date Comments Reference number ISO 7789:2007(E)INTERNATIONAL STANDARD ISO 7789 Second edition 2007-10-01 Hydraulic fluid power Two-, three- and four-port screw-in cartridge valves Cavities BS ISO 7789:2007ii iii Contents Page Forewor
5、d iv Introduction v 1 Scope. 1 2 Normative references. 1 3 Terms, definitions and symbols 2 4 Dimensions 2 5 Tolerances. 2 6 Ports usage and identification 3 7 Identification statement (Reference to this International Standard) 3 Bibliography . 24 BS ISO 7789:2007iv Foreword ISO (the International O
6、rganization 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 committee has been estab
7、lished 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 electrotechnical standardizat
8、ion. 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 member bodies for voting
9、. 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 identifying any or all such p
10、atent rights. ISO 7789 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5, Control products and components. This second edition cancels and replaces the first edition (ISO 7789:1998), which has been technically revised. It also incorporates the Technical Corrigend
11、um ISO 7789:1998/Cor.1:1999. BS ISO 7789:2007v Introduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Typical components found in such systems include hydraulic valves. These devices control flow direction, press
12、ure or flow rate liquids in the enclosed circuit. BS ISO 7789:2007blank1 Hydraulic fluid power Two-, three- and four-port screw-in cartridge valves Cavities 1 Scope This International Standard specifies the dimensions and provides other data relating to cavities in which two-, three- and four-port,
13、screw-in cartridge valves are mounted in order to ensure interchangeability. It is applicable to two-, three- and four-port screw-in cartridge valves generally used in industrial and mobile equipment. 2 Normative references The following referenced documents are indispensable for the application of
14、this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1101:2004, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location and
15、 run-out ISO 1219-1:2006, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols for conventional use and data-processing applications ISO 1302:2002, Geometrical Product Specifications (GPS) Indication of surface texture in technical product documentation ISO
16、 2768-1:1989, General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications ISO 2768-2:1989, General tolerances Part 2: Geometrical tolerances for features without individual tolerance indications ISO 5598: 1) , Fluid power systems and components Vo
17、cabulary ISO 5783:1995, Hydraulic fluid power Code for identification of valve mounting surfaces and cartridge valve cavities ISO 6149-1:2006, Connections for hydraulic fluid power and general use Ports and stud ends with ISO 261 metric threads and O-ring sealing Part 1: Ports with truncated housing
18、 for O-ring seal ISO 16874:2004, Hydraulic fluid power Identification of manifold assemblies and their components 1) To be published. (Revision of ISO 5598:1985) BS ISO 7789:20072 3 Terms, definitions and symbols For the purposes of this document, the terms and definitions given in ISO 5598 and the
19、graphical symbols given in ISO 1219-1 apply. 4 Dimensions 4.1 The dimensions of cavities for hydraulic screw-in cartridge valves with two-, three- and four-ports shall be selected from the figures and tables specified in 4.2 to 4.10. 4.2 The dimensions of cavities for two-port valves (excluding pres
20、sure-relief valves) with 5 mm to 20,5 mm maximum port diameter are shown in Figure 1 and given in Table 1. 4.3 The dimensions of cavities for two-port pressure-relief valves with 5 mm to 20,5 mm maximum port diameter and with a flow direction from port 1 to port 2, are shown in Figure 2 and given in
21、 Table 3. 4.4 The dimensions of cavities for two-port pressure-relief valves with 6 mm to 20,5 mm maximum port diameter and with a flow direction from port 2 to port 1, are shown in Figure 3 and given in Table 5. 4.5 The dimensions of cavities for three-port valves with 6 mm to 20,5 mm maximum port
22、diameter are shown in Figure 4 and given in Table 7. 4.6 The dimensions of cavities for four-port valves with 6 mm to 20,5 mm maximum port diameter are shown in Figure 5 and given in Table 9. 4.7 The dimensions of cavities for two-port valves (excluding pressure-relief valves) with 10,5 mm to 20,5 m
23、m maximum main port diameter and one pilot port are shown in Figure 6 and given in Table 11. 4.8 The dimensions of cavities for two-port pressure-relief valves with 10,5 mm to 20,5 mm maximum main port diameter, one vent or pilot port and with a flow direction from port 1 to port 2 are shown in Figu
24、re 7 and given in Table 13. 4.9 The dimensions of cavities for two-port pressure-relief valves with 10,5 mm to 20,5 mm maximum main port diameter, one vent or pilot port and with a flow direction from port 2 to port 1 are shown in Figure 8 and given in Table 15. 4.10 The dimensions of cavities for t
25、hree-port valves with 10,5 mm to 20,5 mm maximum main port diameter and one pilot port are shown in Figure 9 and given in Table 17. 5 Tolerances Tolerances values for all dimensions and surface roughness are given in Figures 1 to 9 and in Tables 1, 3, 5, 7, 9, 11, 13, 15 and 17, in accordance with I
26、SO 1101 and ISO 1302. Tolerances for linear and angular dimensions shall be in accordance with the designation as described in ISO 2768-1. Geometrical tolerances shall be in accordance with the designation as described in ISO 2768-2. NOTE All figures in this International Standard indicate tolerance
27、 requirements using the ISO code “ISO 2768-mk” as described in ISO 2768-1 and ISO 2768-2. BS ISO 7789:20073 6 Ports usage and identification 6.1 Interchangeability of cartridge valves in the cavities defined by this International Standard requires uniform identifications and functions of the valve p
28、orts. Symbols for the valve types intended for use in each cavity are shown in Tables 2, 4, 6, 8, 10, 12, 14, 16 and 18. Port usage and identification (1, 2, 3 and 4) are shown on the symbols. 6.2 The tabulated symbols illustrate general types of valves. Variations within each type shall conform to
29、the port usage convention shown for that type. 6.3 Some of the tabulated symbols are commonly combined with other graphic elements to represent a complete valve. For example, the four-port directional control valve shown in Table 10 normally includes operators such as solenoids or springs. Interchan
30、geability of such complete valves requires that the combined symbols, including the added elements, be identical as to port connection in each operator condition. 6.4 The manifold identification shall be in accordance with ISO 16874. 7 Identification statement (Reference to this International Standa
31、rd) It is strongly recommended to manufacturers who choose to conform to this International Standard that the following statement be used in test reports, catalogues and sales literature: “Cavity dimensions and port usage are in accordance with ISO 7789:2007, Hydraulic fluid power Two-, three- and f
32、our-port screw-in cartridge valves Cavities.” BS ISO 7789:20074 Key 1, 2, ports NOTE The same designations are used in Table 2. PD (thread) pitch diameter VE visual examination aThe dimensions given are the minimum space required for a screw-in cartridge valve with an allowance for using an axially
33、fitting tool, such as a box spanner, to tighten the cartridge; if it is necessary to use a flat spanner, then adequate clearance should be provided. This is also the minimum recommended distance between centres of two similarly sized cavities. Connectors on electrically operated valves may exceed th
34、is space dimension and allowance shall be made for fitting and removing any such connectors. bNo burrs permitted in this area, the edge must be rounded. The cavity geometry is normally produced with an appropriate multi-diameter form tool. Sharp edges should be avoided by rounding to a radius of 0,1
35、 mm to 0,2 mm. cRadial groove optional. dDatum area inside ring nose. eThe port is in accordance with ISO 6149-1. Figure 1 Cavities for two-port valves (excluding pressure-relief valves) with 5 mm to 20,5 mm maximum port diameter BS ISO 7789:20075 Table 1 Dimensions for cavities for two-port valves
36、(excluding pressure-relief valves) with 5 mm to 20,5 mm maximum port diameter Dimensions in millimetres Dimension by codificationaParameter 18-01-0-07 20-01-0-07 22-01-0-07 27-01-0-07 33-01-0-07 42-01-0-07 ThreadbM18 1,5 M20 1,5 M22 1,5 M27 2 M33 2 M42 2 D 1min. 32 38 42 48 58 74 D 2H8 15 17 19 23 2
37、9 38 D 315 17 19 23 29 38 T 1min. 14,5 14,5 15,5 19 19 19,5 T 2min. 14,5 14,5 17 22 22 23 T 3max. 19,5 20,5 27,5 35 38,5 43,5 (T 4 ) 20 21 28 35,5 39 44 0,4 5 0 T +21,3 22,3 29,3 37,2 40,7 45,7 T 6min.c29,5 30,5 38,5 46,5 50 56 T 61 60 T +d31 32 40 48 52 58 aCodification is in accordance with ISO 57
38、83. bThe port is in accordance with ISO 6149-1 (relevant for dimensions and tolerances not specified in this International Standard). cThis dimension is the minimum finished length required for the sealing diameter on the cartridge. dSuggested pre-machining depth to obtain appropriate diameter toler
39、ance for T 6 . For some valve types, additional pilot drill dimensions may be specified by the valve manufacturer to provide clearance for an extension to the valve and/or to allow for minimum fluid flow path in this area. Table 2 Symbols for valves entering the cavities shown in Figure 1 Descriptio
40、n Symbol Description Symbol Non-return valve Throttle non-return valve Flow-control valve with free-flow return check Pressure-compensated flow-control valve Pressure-compensated flow control valve with free- flow return check Two-port directional control valve Two-port directional control poppet (s
41、eat) valve BS ISO 7789:20076 Key 1, 2, ports NOTE The same designations are used in Table 4. PD (thread) pitch diameter VE visual examination aThe dimensions given are the minimum space required for a screw-in cartridge valve with an allowance for using an axially fitting tool, such as a box spanner
42、, to tighten the cartridge; if it is necessary to use a flat spanner, then adequate clearance should be provided. This is also the minimum recommended distance between centres of two similarly sized cavities. Connectors on electrically operated valves may exceed this space dimension and allowance sh
43、all be made for fitting and removing any such connectors. bNo burrs permitted in this area; the edge shall be rounded. The cavity geometry is normally produced with an appropriate multi-diameter form tool. Sharp edges should be avoided by rounding to a radius of 0,1 mm to 0,2 mm. cRadial groove opti
44、onal. dDatum area inside ring nose. eThe port is in accordance with ISO 6149-1. Figure 2 Cavities for two-port pressure-relief valves with 5 mm to 20,5 mm maximum port diameter and with a flow direction from port 1 to port 2 BS ISO 7789:20077 Table 3 Dimensions for cavities for two-port pressure-rel
45、ief valves with 5 mm to 20,5 mm maximum port diameter and with a flow direction from port 1 to port 2 Dimensions in millimetres Dimension by codificationaParameter 18-02-0-07 20-02-0-07 22-02-0-07 27-02-0-07 33-02-0-07 42-02-0-07 ThreadbM18 1,5 M20 1,5 M22 1,5 M27 2 M33 2 M42 2 D 1min. 32 38 42 48 5
46、8 74 D 2H8 13,5 15,5 17,5 21,5 27 36 D 313,5 15,5 17,5 21,5 27 36 T 1min. 14,5 14,5 15,5 19 19 19,5 T 2min. 14,5 14,5 17 22 22 23 T 3max. 19,5 20,5 27,5 35 38,5 43,5 (T 4 ) 20 21 28 35,5 39 44 0,4 5 0 T +22,6 23,6 30,6 38,5 42,5 47,5 T 6min.c30,5 31,5 40 48 52 58 T 61 60 T +d32 33 41,5 49,5 54 60 aC
47、odification is in accordance with ISO 5783. bThe port is in accordance with ISO 6149-1 (relevant for dimensions and tolerances not specified in this International Standard). cThis dimension is the minimum finished length required for the sealing diameter on the cartridge. dSuggested pre-machining de
48、pth to obtain appropriate diameter tolerance for T 6 . For some valve types, additional pilot drill dimensions may be specified by the valve manufacturer to provide clearance for an extension to the valve and/or to allow for minimum fluid flow path in this area. Table 4 Symbol for valves entering th
49、e cavities shown in Figure 2 Description Symbol Pressure-relief valve, direct operated Pressure-relief valve, pilot operated BS ISO 7789:20078 Key 1, 2, ports NOTE The same designations are used in Table 6. PD (thread) pitch diameter VE visual examination aThe dimensions given are the minimum space required for a screw-in cartridge valve with an allowance for using an axially fitting tool, such as a box spanner, to tigh
