1、BRITISH STANDARD BS7403-2: 1998 ISO4548-2: 1997 Full-flow lubricating oil filters for internal combustion engines Part2: Method of test for element by-pass valve characteristics ICS27.020BS7403-2:1998 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was
2、published underthe authority of the Standards Board and comesintoeffect on 15March1998 BSI 04-1999 ISBN 0 580 29615 6 National foreword This British Standard reproduces verbatim ISO4548-2:1997 and implements it as the UK national standard. BS7403-2, together with BS7403-1, BS7403-3 and BS7403-4, sup
3、ersedes BS4836:1972 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee MCE/21, Filters for gases and liquids, to Subcommittee MCE/21/5, Filters for lubricating oil, which has the responsibility to: aid enquirers to understand the text; present to the res
4、ponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained
5、on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facili
6、ty of the BSI Standards Electronic Catalogue. 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 confer immunity from legal obligati
7、ons. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pagesii toiv, pages1 to6 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 tabl
8、e on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS7403-2:1998 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO 4548-2 1ii blankBS 7403-2:1998 ii BSI 04-1999 Contents Page Foreword iii Introduction 1 1 Scope 1 2 Normative
9、 references 1 3 Definitions 1 4 Graphical symbols 1 5 Operational characteristics to be tested 1 6 Filter to be tested 1 6.1 Filter assembly 1 6.2 By-pass valve 2 7 Test rig 2 7.1 Sump 2 7.2 Regulating valves 2 7.3 Flow meter 2 7.4 Inlet and outlet pipes to the filter 2 7.5 Discharge pipe from sampl
10、ing valve 2 8 Test liquids 2 9 Accuracy of test condition measurements 4 10 Test procedure 4 11 Report of test results 4 Annex A (informative) Bibliography 6 Figure 1 Diagrammatic arrangement of test rig 3 Figure 2 Example of a test report 5 Table 1 Measurement accuracies 4 Descriptors: Internal com
11、bustion engines, lubrication systems, oil filters, tests, performance tests, test report sheets.BS 7403-2:1998 BSI 04-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internati
12、onal 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 liaison with IS
13、O, 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 as an Int
14、ernational Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO4548-2 was prepared by Technical Committee ISO/TC70, Internal combustion engines, Subcommittee SC7, Tests for lubricating oil filters. This second edition cancels and replaces the firs
15、t edition (ISO4548-2:1982), which has been technically revised. ISO4548 consists of the following parts, under the general title Methods of test for full-flow lubricating oil filters for internal combustion engines: Part1: Differential pressure/flow characteristics; Part2: Element by-pass valve char
16、acteristics; Part3: Resistance to high differential pressure and to elevated temperature; Part4: Initial particle retention efficiency, life and cumulative efficiency (gravimetric method); Part5: Cold start simulation and hydraulic pulse durability test; Part6: Static burst pressure test; Part7: Vib
17、ration fatigue test; Part9: Inlet and outlet anti-drain valve tests; Part10: Life and cumulative efficiency in the presence of water in oil; Part11: Self-cleaning filters; Part12: Particle retention ability and contaminant holding capacity using particle counting. Annex A of this part of ISO4548 is
18、for information only.iv blankBS 7403-2:1998 BSI 04-1999 1 Introduction ISO4548 establishes standard test procedures for measuring the performance of full-flow lubricating oil filters for internal combustion engines. It has been prepared in separate parts, each part relating to a particular performan
19、ce characteristic. Together the tests provide the information necessary to assess the characteristics of a filter, but if agreed between the purchaser and the manufacturer, the tests may be conducted separately. This revision of this part of ISO4548 has been undertaken in order to align the presenta
20、tion with the requirements of the current ISO Directives. The principal changes are editorial, affecting the layout and the text. Minor technical changes comprise the inclusion of ISO VG and SAE oil grades for the test liquids and the addition of a note concerning the specification of the valve open
21、ing pressure. In addition, the test rig dimensions have been modified to make them consistent with those specified in ISO3968 and the flow meter has been repositioned downstream of the throttle valve. 1 Scope This part of ISO4548 specifies tests for determining the element by-pass valve characterist
22、ics of full-flow lubricating oil filters for internal combustion engines. Tests are specified with oils at two viscosities, one to assess the performance of an element by-pass valve with a cold oil and the other to assess its performance with an oil at a typical operating temperature. 2 Normative re
23、ferences The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO4548. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreement based on this part of ISO4548 are en
24、couraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO1219-1:1991, Fluid power systems and components Graphic symbols and circuit diagrams Part1: Graphic
25、symbols. ISO11841-1: 1) , Road vehicles and internal combustion engines Filter vocabulary Part1: Definitions of filters and filter components. ISO11841-2: 1) , Road vehicles and internal combustion engines Filter vocabulary Part2: Definitions of characteristics of filters and their components. 3 Def
26、initions For the purposes of this part of ISO4548, the definitions given in ISO11841-1 and ISO11841-2 apply. 4 Graphical symbols The graphical symbols used in this part of ISO4548 are in accordance with ISO1219-1. 5 Operational characteristics to be tested The purpose of the element by-pass valve of
27、 a lubricating oil filter is to maintain an adequate supply of oil to the engine when the differential pressure across the filter element is high, even if the oil is not then filtered. Such conditions may occur, for example, when the engine is started from cold or in the event of the element becomin
28、g choked. To limit the quantity of unfiltered oil passed to the engine when there is no excessive differential pressure across the filter, it is customary for the by-pass valve to be designed not to open below a specified differential pressure and to allow leakage at no more than a specified rate wh
29、en the differential pressure is not above the value. To maintain an adequate oil supply to the engine when the filter element is completely choked, it is customary for the by-pass valve to be designed to pass the full oil flow with no more than a specified differential pressure. The tests specified
30、in this part of ISO4548 measure the differential pressure across the by-pass valve over the whole range of oil flow rates. These tests include the requirement that a note shall be made of any noise emitted by the by-pass valve for example, due to valve oscillation. This is because there has been fou
31、nd to be a correlation between noise in these components and wear. The differential pressure is measured across the complete filter assembly as described in6.1. 6 Filter to be tested 6.1 Filter assembly The filter element shall be removed from the filter and in its place there shall be installed a n
32、on-permeable dummy element of identical dimensions. 1) To be published.BS7403-2:1998 2 BSI 04-1999 In the case of a filter whose element cannot readily be replaced by a non-permeable dummy element, for example a spin-on cartridge filter, the unit shall be opened and the by-pass valve shall be remove
33、d for testing in a separate housing, the design of which shall be agreed between the manufacturer and the purchaser of the filter. 6.2 By-pass valve The filter by-pass valve for test, the test liquid and the test rig shall be clean. For the purpose of this part of ISO4548, the term “clean” means tha
34、t there is no detectable increase in differential pressure across a filter of the type under test (not modified in accordance with6.1) when the test liquid at the test temperature is circulated through the test rig and the filter at the rated flow of the filter for5min. 7 Test rig The test rig is sh
35、own diagrammatically in Figure 1. It shall include the components described in7.1 to7.5, together with the necessary tubing, connectors and supports. 7.1 Sump The sump shall be capable of holding sufficient oil and shall be equipped with a thermostatically controlled heater and cooler capable of mai
36、ntaining the test temperature. The heater shall be arranged so that local overheating of the oil is avoided. The by-pass return to the sump and the filter outlet pipe shall terminate below the surface of the oil in the sump when the oil is in circulation. The temperature shall be arranged so that th
37、e stipulated viscosity is maintained. 7.2 Regulating valves The regulating valves,3 and11, shall be used for the purposes of pressure and flow control. Needle valves or diaphragm type valves are recommended. 7.3 Flow meter The flow meter shall be suitable for use with oils of24mm 2 /s 2)and500mm 2 /
38、s kinematic viscosity and shall register the flow in the pipeline leading to the filter. As an alternative, the flow meter may be installed at the filter outlet pipe. A calibrated measuring vessel and stop watch may be used. 7.4 Inlet and outlet pipes to the filter The inlet and outlet pipe bores sh
39、all be equivalent to the sizes of the inlet and outlet ports of the filter. Alternatively, the sizes of the inlet and outlet pipes shall be as agreed between the manufacturer and the purchaser of the filter, for example to match the ports in the engine block on which the filter is to be used. Tappin
40、gs for the measurement of the differential pressure across the complete filter shall be made at five internal pipe diameters upstream of the filter inlet port and ten internal pipe diameters downstream from the filter outlet port. The inlet and outlet pipes shall be straight and free from obstructio
41、n for eight internal pipe diameters upstream and 13 internal pipe diameters downstream of the filter inlet and outlet ports. 7.5 Discharge pipe from sampling valve To avoid draining the complete filter outlet pipe when the leakage rate is being measured, the free discharge pipe from the sampling val
42、ve10 shall be taken to a height level with the filter under test. NOTEThe discharge pipe is not shown in Figure 1. 8 Test liquids Unless otherwise agreed between the manufacturer and the purchaser of a filter, lubricating oils shallbe selected and used in the tests at a suitable temperature to produ
43、ce kinematic viscosities of24mm 2 /s for simulating general operatingconditions and of500mm 2 /s when simulating cold conditions of operation. The temperature of the oils shall not exceed100C. NOTE 1In order to achieve these viscosities it may be necessary to use two different oils. A viscosity of24
44、mm 2 /s can be achieved with ISO VG100 (SAE30) oil (see 1 and 3) at an approximate temperature of74C or ISO VG150 (SAE40) oil at an approximate temperature of83C. A viscosity of500mm 2 /s can be achieved with ISO VG460 (SAE140) oil (see 1 and 3) at an approximate temperature of38C. NOTE 2Intermingli
45、ng of the two designated test oils may take place, particularly when alternating their use in the same test equipment. The magnitude of the resultant viscosity shift should be closely monitored, and compensation made for changes by altering the test temperature, or by partial or complete replacement
46、 of the test oils. 2) 1mm 2 /s=1cStBS 7403-2:1998 BSI 04-1999 3 Figure 1 Diagrammatic arrangement of test rigBS7403-2:1998 4 BSI 04-1999 9 Accuracy of test condition measurements Measurement of test conditions shall be maintained within the levels of accuracy given in Table 1. Differential pressures
47、 shall be measured in kilopascals (kPa). Table 1 Measurement accuracies 10 Test procedure 10.1 Install the filter under test (modified in accordance with6.1) in the test rig as shown in Figure 1. 10.2 Add the required quantity of clean test liquid to the sump1 and circulate it through the test rig v
48、ia the by-pass pipe only. No test liquid shall pass through the filter at this stage. 10.3 Switch on the heater or cooler and adjust the thermostat to the required temperature (seeclause8). Allow the temperature to become stabilized. 10.4 When the temperature of the oil in the sump1 has become stabi
49、lized, pass the liquid through the filter by-pass valve at approximately50% of the filter rated flow. Allow the temperature to become to stabilized again. Bleed the system, if necessary. 10.5 When the temperature indicator7 shows that the temperature of the oil at the filter inlet has become stabilized at the required value (seeclause8), prime the free discharge pipe from the sampling valve10, the oil collected from it being returned to the sump. Reduce the flow through the filter by-pass valve to zero several ti
