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1、BRITISH STANDARD BS ISO 11170:1995 Hydraulic fluid power Filter elements Procedure for verifying performance characteristics ICS 23.100.30 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11170:1995 This British Standard, having been p
2、repared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1997 BSI 12-1998 ISBN 0 580 26506 4 National foreword This British Standard reproduces verbatim ISO 11170:1995, and implements it as the UK nation
3、al standard. The UK participation in its preparation was entrusted to Technical Committee MCE/18, Fluid power systems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible European/international committee any enquiries on the interpretation
4、, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Cat
5、alogue under the section entitled “International Standards Correspondence Index”. A British Standard 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
6、 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporat
7、ed. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:4
8、3:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11170:1995 ii BSI 12-1998 Contents Page Forewordiii Introduction1 1Scope1 2Normative references1 3Definitions1 4Test samples1 5Procedure1 6Qualification test report2 Annex A (informative) BibliographyInside back cover Table 1 Test sequence2 Lice
9、nsed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11170:1995 BSI 12-1998iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
10、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 non-governmental, in liaiso
11、n with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication
12、as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11170 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 8, Product testing and contamination control. Annex A of this International Stand
13、ard is for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11170:1995 BSI 12-19981 Introduction In h
14、ydraulic fluid power systems, power is transmitted and controlled through a liquid under pressure within an enclosed circuit. Filters maintain fluid cleanliness by removing insoluble contaminants. The filter element is the porous device which performs the actual process of filtration. 1 Scope This I
15、nternational Standard defines a procedure for verification of the performance characteristics of filter elements. It can be used to check their hydraulic, mechanical and separation characteristics. NOTE 1This procedure includes all or part of the tests defined in the International Standards listed i
16、n clause 2. If needed, and after agreement between the customer and manufacturer, the procedure can be repeated on several elements. NOTE 2This procedure differs from an approval or qualification procedure in that standardized materials and apparatus are specified. An approval or qualification proce
17、dure may include some of these tests but with materials and test conditions that represent the actual conditions of use (e.g. the operating fluid). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Sta
18、ndard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of
19、IEC and ISO maintain registers of currently valid International Standards. ISO 2941:1974, Hydraulic fluid power Filter elements Verification of collapse/burst resistance. ISO 2942:1994, Hydraulic fluid power Filter elements Verification of fabrication integrity and determination of the first bubble
20、point. ISO 2943:1974, Hydraulic fluid power Filter elements Verification of material compatibility with fluids. ISO 3723:1976, Hydraulic fluid power Filter elements Method for end load test. ISO 3724:1976, Hydraulic fluid power Filter elements Verification of flow fatigue characteristics. ISO 3968:1
21、981, Hydraulic fluid power Filters Evaluation of pressure drop versus flow characteristics. ISO 4572:1981, Hydraulic fluid power Filters Multipass method for evaluating filtration performance. ISO 5598:1985, Fluid power systems and components Vocabulary. 3 Definitions For the purposes of this Intern
22、ational Standard, the definitions given in ISO 5598 apply. 4 Test samples The filter elements selected for qualification testing shall be representative of the lot and of all subsequently manufactured filter elements of the same model. Some tests are destructive or make the filter element unsuitable
23、 for further tests. It is therefore essential to have available a sufficient number of filter elements. 5 Procedure Subject three filter elements to the tests specified in 5.1 and 5.2. The qualification tests and their sequence are given for each filter in Table 1. The sequence of tests ensures that
24、 qualification is complete while limiting the number of tests. 5.1 Fabrication integrity test 5.1.1 Check filter fabrication integrity in accordance with ISO 2942. Carry on with the test until the first bubble point. Record the pressure value at the first bubble point and check that it is greater th
25、an or equal to the pressure specified by the supplier. Dry the filter elements in a ventilated drying oven at 60 C for at least 1 h. WARNING Exercise care when drying filter elements rinsed with solvents which have a low flash point. 5.1.2 Identify the three filter elements in ascending order of the
26、 first bubble point pressure, with element 1 having the lowest pressure and element 3 the highest pressure. 5.2 Compatibility test (see ISO 2943) WARNING Refer to local safety requirements. 5.2.1 Immerse the filter elements in the operating test fluid for at least 72 h. The fluid shall be maintained
27、 at the test temperature for 72 h, either continuously or intermittently. During this period, do not remove the elements from the fluid. The test temperature is usually 15 C above the manufacturers recommended maximum operating temperature, providing it is at least 50 C below the fluid flashing poin
28、t. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11170:1995 2 BSI 12-1998 This test may also be performed at low temperature (5 C below the expected coldest temperature of use). 5.2.2 There shall be no visual evidence of structural,
29、 seal or filter medium failure. 5.2.3 Rinse the filter elements three times by submerging the filters in a reservoir containing filtered heptane or another suitable fluid (contaminated with no more than 20 particles of size 5 m or larger and no more than 5 particles of size 15 m or larger, per milli
30、litre of fluid) for a period of 10 min. Then rinse the filter elements inside and outside with a jet of the same solvent filtered through a 0,8 m membrane disc. This rinsing operation shall be performed as carefully as possible (so as not to damage the filter element) by covering all of the filter s
31、urface with the rinsing jet. 5.2.4 Finally dry the filter elements in a ventilated drying oven at 60 C for at least 1 h. WARNING Exercise care when drying filter elements rinsed with solvents which have a low flash point. 5.2.5 Check again the fabrication integrity of each filter as indicated in 5.1
32、. It may be possible to conduct the bubble point pressure tests in the same type of solvent used to rinse the filter element. In this case, it is not necessary to dry the elements as specified in 5.2.4. Check also that this first bubble point pressure and the one found in 5.1 do not differ by more t
33、han 25 %. 5.3 Qualification tests For a given filter element, the test sequence shall be as given in Table 1. The order of testing of the filter elements is not important. 6 Qualification test report Prepare a test report for each test carried out. The qualification test report shall include all spe
34、cific test reports and the related test values. Table 1 Test sequence TestTest procedures and apparatus Acceptance criteria or approval results Filter element No. 1 Filtration efficiencySee ISO 4572Values of and CR Retention capacity Collapse/burst resistanceSee ISO 2941No visual evidence of structu
35、ral, seal or filter medium failure No decrease in the slope of the pressure drop versus contaminant added Fabrication integrity shall be verified Filter element No. 2 End load test ratingSee ISO 3723:1976, except for subclause 5.1 No visual evidence of structural, seal or filter medium failure See I
36、SO 3723:1976, subclause 6.1 Fabrication integrity shall be verified Filter element No. 3 Pressure dropSee ISO 3968p curve Fatigue due to cyclic flow variation See ISO 3724No visual evidence of structural, seal or filter medium failure See ISO 3724:1976, subclause 7.1 Fabrication integrity shall be v
37、erified Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 11170:1995 BSI 12-1998 Annex A (informative) Bibliography 1 ISO 4406:, Hydraulic fluid power Fluids Code for defining the level of contamination by solid particles1). 2 ISO 7744:
38、1986, Hydraulic fluid power Filters Statement of requirements. 1) To be published. (Revision of ISO 4406:1987) Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 06:43:34 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | |
39、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for
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