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1、 Reference number ISO 3724:2007(E) ISO 2007 INTERNATIONAL STANDARD ISO 3724 Second edition 2007-08-15 Hydraulic fluid power Filter elements Determination of resistance to flow fatigue using particulate contaminant Transmissions hydrauliques lments filtrants Dtermination de la rsistance la fatigue du
2、e au dbit en utilisant un contaminant particulaire Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from
3、IHS -,-,- ISO 3724:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. 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.
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6、address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. 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
7、 ISO at the address below or ISOs member body in the country of the requester. 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 2007 All rights reserved Copyright International
8、Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3724:2007(E) ISO 2007 All rights reserved iii Contents Page F
9、oreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 2 4 Graphic symbols and circuit diagrams 2 5 Test apparatus 2 6 Accuracy of measurements and test conditions. 4 7 Test procedure 5 8 Criteria for acceptance. 6 9 Data presentation 6 10 Identification statement (
10、reference to this International Standard) 6 Annex A (informative) Data from round robin tests performed to verify the ISO 3724 procedure 8 Bibliography. 12 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Be
11、rnie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3724:2007(E) iv ISO 2007 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bod
12、ies). 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 organizations, governmental and
13、 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 ISO/IEC Directives,
14、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 the member bodies cast
15、ing 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 3724 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommitte
16、e SC 6, Contamination control. This second edition cancels and replaces the first edition (ISO 3724:1976), which has been technically revised. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for
17、Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3724:2007(E) ISO 2007 All rights reserved v Introduction In hydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. The flu
18、id is both a lubricant and a power-transmitting medium. Filters maintain fluid cleanliness by removing insoluble contaminants. The filter element is a porous device that performs the actual process of filtration. The effectiveness of the filter element in controlling contaminants is dependent upon i
19、ts design and its sensitivity to any unsteady operating conditions that can stress and cause damage to the filter element. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 0
20、3:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking
21、permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 3724:2007(E) ISO 2007 All rights reserved 1 Hydraulic fluid power Filter elements Determination of resistance to flow fatigue using particulate contaminant 1 Scope This International Standard specifies a method for determining the r
22、esistance of a hydraulic filter element to flow fatigue after it has been loaded with particulate contaminant and subjected to a uniform varying flow rate and predetermined maximum element differential pressure. It establishes a uniform method for verifying the ability of a filter element to withsta
23、nd the flexing caused by cyclic differential pressures induced by a variable flow rate. NOTE Annex A summarizes data from a round robin test performed to verify the procedure specified in this International Standard. 2 Normative references The following referenced documents are indispensable for the
24、 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 symbols f
25、or conventional use and data-processing applications ISO 1219-2, Fluid power systems and components Graphic symbols and circuit diagrams Part 2: Circuit diagrams ISO 29411), Hydraulic fluid power Filter elements Verification of collapse/burst pressure rating ISO 2942, Hydraulic fluid power Filter el
26、ements Verification of fabrication integrity and determination of the first bubble point ISO 2943, Hydraulic fluid power Filter elements Verification of material compatibility with fluids ISO 55982), Fluid power systems and components Vocabulary 1) To be published. (Revision of ISO 2941:1974) 2) To
27、be published. (Revision of ISO 5598:1985) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,-
28、 ISO 3724:2007(E) 2 ISO 2007 All rights reserved 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and the following apply. 3.1 filter element resistance to flow fatigue ability of a filter element to resist structural failure due to flexing cause
29、d by cyclic system flow rate conditions 3.2 maximum assembly differential pressure pA sum of the housing differential pressure and the maximum element differential pressure 3.3 housing differential pressure pH differential pressure of the filter housing without an element 3.4 maximum element differe
30、ntial pressure pE maximum differential pressure across the filter element designated by the manufacturer as the limit of useful performance 4 Graphic symbols and circuit diagrams Graphic symbols used in this International Standard are in accordance with ISO 1219-1 and circuit diagrams in accordance
31、with ISO 1219-2. 5 Test apparatus 5.1 Pressure-sensing and recording instruments, with a frequency response capable of measuring the full pressure-versus-time curve (see Figure 1). 5.2 Flow fatigue cycle test stand, capable of varying the test flow rate from 0 l/min up to the rated flow rate (see Fi
32、gures 1 and 2). 5.3 Test filter housing, capable of ensuring that the fluid cannot bypass the filter element. The filter shall be capable of being modified to suit this purpose. 5.4 Test fluid, with a viscosity between 14 mm2/s and 32 mm2/s at the test temperature. The compatibility of the fluid and
33、 filter element material shall be verified in accordance with ISO 2943. Any fluid that is compatible with the filter element material may be used. 5.5 Cycle counting device, capable of recording the number of flow fatigue cycles. 5.6 Inert particulate contaminant, not able to add strength to the fil
34、ter element, used to load the filter element being evaluated. NOTE Test dust according to ISO 12103-1 is suitable. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 03:12:12
35、MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3724:2007(E) ISO 2007 All rights reserved 3 Key X time (s) Y pressure (kPa) 1 actual test pressure (kPa) 2 one test cycle, T pL lower test pressure; pL u 10 % pU pU upper test pressure; tolerance on pU is 10 % TR rise time
36、; TR = (15 5) %T T1 time at pressure; T1 = (35 5) %T TF fall time; TF = (15 5) %T T2 time without pressure; T2 = (35 5) %T Figure 1 Flow fatigue cycle test waveform Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User
37、=Wing, Bernie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3724:2007(E) 4 ISO 2007 All rights reserved Key 1 contaminant injection 2 system pump 3 alternative point of contaminant injection 4 cycling valve 5 temperature sensor 6 fi
38、lter under test 7 differential pressure transducer 8 relief valve 9 flow meter 10 heat exchanger NOTE The circuit in this figure is simplified and includes only the basic components needed for conducting the test specified in this International Standard. Other components or additional circuitry (e.g
39、. clean-up filter loop) can be used. Figure 2 Typical filter element in flow fatigue cycle test stand circuit 6 Accuracy of measurements and test conditions Instruments used to measure test parameters shall provide a reading accuracy in accordance with Table 1. Test conditions shall be maintained wi
40、thin the tolerances specified in Table 1. Table 1 Instrument accuracy and allowed test condition variation Test condition SI unit Instrument accuracy Tolerance on reading Allowed test condition variation Flow rate l/min 2 % 10 % Differential pressure kPa 2 % 10 % Temperature C 1 C 3 C Cycle rate Hz
41、10 % Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 08/18/2007 03:12:12 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3724:2007(E) ISO 2007 All rights
42、 reserved 5 7 Test procedure 7.1 Subject the filter element under test to a fabrication integrity test in accordance with ISO 2942. 7.2 Disqualify from further testing any element that fails to pass the criteria specified in ISO 2942. 7.3 Install the test filter housing in the flow fatigue cycle tes
43、t stand (see 5.2 and Figure 2). 7.4 Plot the curve of housing differential pressure (pH) versus flow rate (q). Determine the test filter housing differential pressure from at least 25 % up to 100 % of the rated flow rate at the test temperature selected. Record the results in the test report (see Ta
44、ble 2). 7.5 Install the filter element in the test filter housing. 7.6 Calculate and plot the maximum assembly differential pressure (pA) curve, corresponding to the predetermined maximum element differential pressure (pE) plus the housing differential pressure (pH), at the same flow rates as those
45、given in 7.4. Record the results in the test report (see Table 2). 7.7 Add the test contaminant until the maximum assembly differential pressure (pA) is reached. NOTE 1 The filter element will need more contaminant in order for the maximum element differential pressure to be reached at 25 % of the r
46、ated flow rate. However, because the filter element can experience particle desorption due to the variation in flow rate, it is suggested that initial contaminant be injected at the minimum or intermediate flow rate (that is 25 % or other percentage of rated flow rate) until the maximum assembly dif
47、ferential pressure is reached. This approach can minimize the total amount of contaminant used throughout the test, as the differential pressure can be maintained by increasing the flow rate instead of adding more contaminant. If it is advantageous to start flow fatigue cycling while loading the fil
48、ter element to the maximum assembly differential pressure, ensure that the cycle counting device is reset to zero before proceeding to 7.8. Initially, contaminant should be added in a uniform manner. For incremental injections, a mass of 5 % of the estimated filter element contaminant capacity per injection is recommended. A