《ISO-4411-2008.pdf》由会员分享，可在线阅读，更多相关《ISO-4411-2008.pdf（14页珍藏版）》请在三一文库上搜索。
1、 Reference number ISO 4411:2008(E) ISO 2008 INTERNATIONAL STANDARD ISO 4411 Second edition 2008-10-01 Hydraulic fluid power Valves Determination of pressure differential/flow characteristics Transmissions hydrauliques Distributeurs Dtermination des caractristiques de pression diffrentielle/dbit Copy
2、right International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4411:2008(E) PDF disclaimer This PDF file may contain embedded t
3、ypefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not in
4、fringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were o
5、ptimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved
6、. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.
7、 ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
8、ee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4411:2008(E) ISO 2008 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
9、dies (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 established has the right to be represented on that committee. International organizatio
10、ns, 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 standardization. International Standards are drafted in accordance with the rules given in the
11、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. Publication as an International Standard requires approval by at least 75 % of th
12、e 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 patent rights. ISO 4411 was prepared by Technical Committee ISO/TC 131, Fluid power
13、systems, Subcommittee SC 5, Control products and components. This second edition cancels and replaces the first edition (ISO 4411:1986), which has been technically revised. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 N
14、ot for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4411:2008(E) iv ISO 2008 All rights reserved Introduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit.
15、 Hydraulic valves control the direction, pressure or flow rate of the fluid in the system. When fluid flows through a valve, it encounters some resistance, which results in a loss of pressure; this loss is called the pressure differential. This International Standard is intended to unify testing met
16、hods for hydraulic fluid power valves to enable the pressure differential/flow characteristics of different valves to be compared. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo r
17、eproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 4411:2008(E) ISO 2008 All rights reserved 1 Hydraulic fluid power Valves Determination of pressure differential/flow characteristics 1 Scope This International Standard specifies methods for determining, un
18、der steady-state conditions, the pressure differential caused by the flow through any given path in a hydraulic fluid power valve. Requirements for test installations, procedures and presentation of results are specified. 2 Normative references The following referenced documents are indispensable fo
19、r the application of 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 1219-1, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symb
20、ols for conventional use and data-processing applications ISO 4401, Hydraulic fluid power Four-port directional control valves Mounting surfaces ISO 55981), Fluid power systems and components Vocabulary ISO 5781, Hydraulic fluid power Pressure-reducing valves, sequence valves, unloading valves, thro
21、ttle valves and check valves Mounting surfaces ISO 6263, Hydraulic fluid power Compensated flow-control valves Mounting surfaces ISO 6264, Hydraulic fluid power Pressure-relief valves Mounting surfaces ISO 9110-1, Hydraulic fluid power Measurement techniques Part 1: General measurement principles IS
22、O 9110-2, Hydraulic fluid power Measurement techniques Part 2: Measurement of average steady-state pressure in a closed conduit ISO 10372, Hydraulic fluid power Four- and five-port servovalves Mounting surfaces 3 Terms and definitions For the purposes of this document, the terms and definitions give
23、n in ISO 5598 and the following apply. 3.1 tare pressure differential pressure loss between the pressure-tapping points as generated by the test equipment exclusive of the test valve 1) To be published. (Revision of ISO 5598:1985) Copyright International Organization for Standardization Provided by
24、IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4411:2008(E) 2 ISO 2008 All rights reserved 3.2 measured pressure differential measured pressure loss between the pressure-tappin
25、g points, including the pressure loss through the test valve and the test equipment 3.3 flow rate qV volume rate of flow at the point of measurement 3.4 pressure differential p pressure loss attributed to the test valve 4 Symbols and units 4.1 The symbols and units used throughout this International
26、 Standard are shown in Table 1. 4.2 The graphical symbols used in Figures 1 to 3 are in accordance with ISO 1219-1. Table 1 Symbols and units Reference subclause Quantity Symbol Dimension a Unit b 3.3 3.4 Volume flow rate Pressure differential Inside diameter of tube Temperature Kinematic viscosity
27、Mass density qV p d L3T1 ML1T2 L L2T1 ML3 m3/s Pa c m C m2/s kg/m3 a M signifies mass, L signifies length, T signifies time. b The use of practical units for the presentation of results is described in Annex A. c 1 Pa = 1 N/m2. 5 Test installations NOTE Annex B provides a checklist for the selection
28、 of appropriate items upon which agreement between the parties concerned is recommended prior to testing. 5.1 Selection, calibration and installation of equipment 5.1.1 Equipment shall be selected in accordance with ISO 9110-2. 5.1.2 Calibration shall be carried out in accordance with ISO 9110-1. 5.
29、1.3 The test set-up shall be in accordance with ISO 9110-2. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO
30、4411:2008(E) ISO 2008 All rights reserved 3 5.2 Test circuit 5.2.1 A circuit suitable for testing valves as shown in Figure 1 shall be used. The requirements for the position of the pressure-measuring connections and the flow meter shown in Figure 1 and referred to in 5.2.5 through 5.2.9 apply only
31、to Class A measurement accuracy. Figure 1 illustrates a basic circuit that does not incorporate all the safety devices necessary to protect against damage in the event of component failure. It is important that those responsible for carrying out the test give due consideration to safeguarding both p
32、ersonnel and equipment. Key 1 controllable flow supply, at controlled fluid temperature 2 relief valve (circuit protection) 3 stop valve (normally fully open) 4 pressure differential measuring device 5 test valve 6 temperature measuring device 7 flow meter Figure 1 Test circuit diagram Copyright Int
33、ernational Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4411:2008(E) 4 ISO 2008 All rights reserved 5.2.2 On subplate-mounted val
34、ves and sandwich-mounted valves, measurements should be carried out using standard pressure-tapping plates (intermediate plates) as shown in Figure 2. In this case, the requirements given in 5.2.5 through 5.2.8 and 5.3 do not apply. Dimension A shall be the maximum port size specified in ISO 4401, I
35、SO 5781, ISO 6263, ISO 6264 or ISO 10372 for the valve being tested. Dimension B shall be appropriate for the selected interface O-ring. The threaded port size shall be appropriate for the flow rating of the valve. Only one port is shown, which would be typical for P, T, A and B ports. Dimensions in
36、 millimetres Figure 2 Standard pressure-tapping plate for subplate-mounted valves 5.2.3 A fluid supply with controllable flow shall be used. 5.2.4 A relief valve shall be installed to protect the circuit from excessive pressure. 5.2.5 To establish a steady flow pattern at the upstream tapping, a vis
37、ibly straight, uniform-bore tube length of at least 10d shall be used. 5.2.6 A visibly straight, uniform-bore tube length of at least 5d shall be used between the upstream and downstream pressure tapping and the valve. 5.2.7 To ensure adequate pressure recovery, a visibly straight, uniform-bore tube
38、 length of at least 10d shall be used between the test valve and the downstream pressure tapping. 5.2.8 A visibly straight, uniform-bore tube length of at least 5d shall be used between the downstream pressure tapping and the temperature measuring point. 5.2.9 A flow meter shall be installed to meas
39、ure the flow rate at a point at least 5d downstream of the tube length described in 5.2.8. Turbines or thermal meters that do not contain flow straighteners should be installed at least 10d downstream. Copyright International Organization for Standardization Provided by IHS under license with ISO Li
40、censee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 4411:2008(E) ISO 2008 All rights reserved 5 5.2.10 Tubes and connectors consistent with the port size of the valve shall be used. 5.3 Pressure-tapping points
41、5.3.1 Static pressure measuring connections shall be used in accordance with ISO 9110-2. 5.3.2 For all classes of measurement accuracy, single pressure tapping shall be used. 5.3.3 Tapping shall not be installed on the lowest point of the tube. 6 Test procedures 6.1 Measurement accuracy The test sha
42、ll be carried out to one of three classes of measurement, A, B or C, as defined in ISO 9110-1. The measurement class shall be as agreed between the parties concerned. Permissible systematic errors for the measurement classes shall be as shown in Table 2. Table 2 Permissible systematic errors of meas
43、uring instruments as determined during calibration Permissible systematic errors for classes of measurement accuracy Parameter of measuring instrument A B C Flow rate, q, expressed in percent 1,0 2,0 3,0 Differential pressure, p, expressed in percent 1,0 3,0 5,0 Temperature, expressed in kelvins 0,5
44、 1,0 2,0 6.2 Test fluid 6.2.1 A test fluid approved by the manufacturer of the valve shall be used when carrying out the tests. A description of the fluid shall be recorded, and its mass density, , and kinematic viscosity, , for the range of temperature used in the test shall be stated. 6.2.2 The fl
45、uid cleanliness level shall be maintained within the limits recommended by the valve manufacturer. 6.2.3 For class A or B measurement accuracy, the mass density, , and the kinematic viscosity, , from fluid samples taken from the test installation shall be measured immediately before the test. 6.2.4
46、For class C measurement accuracy, it is permissible to use density and viscosity data obtained from the fluid supplier. 6.3 Temperatures 6.3.1 The fluid temperature shall be controlled during the test within the limits specified in Table 3. Table 3 Permissible variation in indicated fluid temperatur
47、e Class of measurement accuracy A B C Variation in temperature indication, expressed in kelvins 1,0 2,0 4,0 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Boeing Co/5910770001 Not for Resale, 01/29/2009 23:41:31 MSTNo reproduction or networki
48、ng permitted without license from IHS -,-,- ISO 4411:2008(E) 6 ISO 2008 All rights reserved 6.3.2 The test shall be carried out within the range of fluid temperatures recommended by the valve manufacturer for the intended application of the valve. 6.4 Steady-state conditions 6.4.1 All readings shall only be recorded after steady-state condit