ISO 4548-2:1997 内燃機関用のフルフロー潤滑油フィルターの試験方法—パート2：エレメントバイパスバルブの特性 | ページ 2

Foreword

ISO (the International Organization 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 established 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 standardization.

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 casting a vote.

International Standard ISO 4548-2 was prepared by Technical Committee ISO/TC 70, Internal combustion engines, Subcommittee SC 7, Tests for lubricating oil filters.

This second edition cancels and replaces the first edition (ISO 4548-2:1982), which has been technically revised.

ISO 4548 consists of the following parts, under the general title Methods of test for full-flow lubricating oil filters for internal combustion engines:

• Part 1: Differential pressure/flow characteristics
• Part 2: Element by-pass valve characteristics
• Part 3: Resistance to high differential pressure and to elevated temperature
• Part 4: Initial particle retention efficiency, life and cumulative efficiency (gravimetric method)
• Part 5: Cold start simulation and hydraulic pulse durability test
• Part 6: Static burst pressure test
• Part 7: Vibration fatigue test
• Part 9: Inlet and outlet anti-drain valve tests
• Part 10: Life and cumulative efficiency in the presence of water in oil
• Part 11: Self-cleaning filters
• Part 12: Particle retention ability and contaminant holding capacity using particle counting

Annex A of this part of ISO 4548 is for information only.

Introduction

ISO 4548 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 performance 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 ISO 4548 has been undertaken in order to align the presentation 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 opening pressure. In addition, the test rig dimensions have been modified to make them consistent with those specified in ISO 3968 and the flow meter has been repositioned downstream of the throttle valve.

1 Scope

This part of ISO 4548 specifies tests for determining the element by-pass valve characteristics 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 references

The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 4548. 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 ISO 4548 are encouraged 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.

Annex A

Bibliography