ISO 4548-9:2008

INTERNATIONAL ISO
STANDARD 4548-9
Second edition
2008-02-01
Methods of test for full-flow lubricating oil
filters for internal combustion engines —
Part 9:
Inlet and outlet anti-drain valve tests
Méthodes d'essai des filtres à huile de lubrification à passage intégral
pour moteurs à combustion interne —
Partie 9: Essais des clapets antiretours aval et amont

Reference number
©
ISO 2008
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ii © ISO 2008 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 1
4.1 Inlet and anti-drain valve. 1
4.2 Outlet anti-drain valve . 1
5 Test rigs . 1
6 Test liquid . 2
7 Test liquid . 2
7.1 General. 2
7.2 Inlet anti-drain valve — Test A: Basic performance test . 2
7.3 Inlet anti-drain valve — Test B: Basic and supplementary performance test. 3
7.4 Outlet anti-drain valve — Test A: Basic performance test . 4
7.5 Outlet anti-drain valve — Test B: Basic and supplementary performance test. 5
8 Test report . 6
Bibliography . 10

Foreword
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(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
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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 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 4548-9 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 4548-9:1995), of which it constitutes a minor
revision.
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 11: Self-cleaning filters
⎯ Part 12: Filtration efficiency using particle counting, and contaminant retention capacity
iv © ISO 2008 – All rights reserved

Introduction
The ISO 4548 series establishes standard test procedures for measuring and 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 can be conducted separately.

INTERNATIONAL STANDARD ISO 4548-9:2008(E)

Methods of test for full-flow lubricating oil filters for internal
combustion engines —
Part 9:
Inlet and outlet anti-drain valve tests
1 Scope
This part of ISO 4548 specifies methods of measuring the effectiveness of either inlet or outlet anti-drain
valves if fitted to a full-flow lubricating oil filter of the “spin-on” or “easy change” type, for internal combustion
engines.
2 Normative references
The following referenced documents are indispensable for 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 4548-1, Methods of test for full-flow lubricating oil filters for internal combustion engines — Part 1:
Differential pressure/flow characteristics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4548-1 apply.
4 Principle
4.1 Inlet and anti-drain valve
Assessment of the capability of the inlet anti-drain valve to prevent oil contained in the filter from draining out
of the inlet when the engine is stopped.
4.2 Outlet anti-drain valve
Assessment of the capability of the outlet anti-drain valve to prevent oil contained in the filter from draining out
the outlet when the engine is stopped.
5 Test rigs
Suggested test rigs are shown diagrammatically in Figures 1 to 3. Figures 1 and 2 are simplified rigs for basic
tests. Figure 3 is a more complicated rig involving the means to raise and lower the header tank at a fixed
speed of 0,5 m/min between a 0 mm and a 1 500 mm head from the test block. This shall be used only if
opening pressures and flow/pressure drop data are required.
[1]
NOTE Graphical symbols used in Figures 1 to 3 are in accordance with ISO 1219-1 .
The test rig shall comprise the following components together with necessary tubing, connectors and
supports:
a) oil reservoir;
b) pump (vane type recommended);
c) screen filter;
d) stopcocks (see Figures 1 to 3);
e) 3-way valves (see Figures 1 to 3);
f) test mounting block;
g) header tank (e.g. a separating funnel);
h) measuring cylinders;
i) stopwatch or clock (not shown).
If it is required to carry out all tests specified in this part of ISO 4548, then a single test rig incorporating the
features of Figures 1 to 3 may be used.
6 Test liquid
1) 2
The test liquid shall be mineral oil that has a kinematic viscosity of 8 mm /s ± 2 mm /s at 20 °C (viscosity

[2]
class ISO VG 5 ).
7 Test liquid
7.1 General
Two test procedures for both inlet and outlet anti-drain valves are described. Test A covers the essential basic
performance of the valve in terms of its function as an anti-drain feature. Test B covers the basic performance
test and additional procedures suggested to ascertain supplementary performance data which may be
required.
7.2 Inlet anti-drain valve — Test A: Basic performance test
7.2.1 An example of the apparatus required for this test is shown in Figure 1. The individual elements of
Figure 1, where referenced in 7.2.2 to 7.2.13 by number, are given in bold typeface inside parentheses.
7.2.2 If the filter incorporates an outlet anti-drain valve then, prior to testing, this valve should be locked
open by a suitable means, to permit entry of oil on the outlet side of the filter.
7.2.3 Carry out the test at an ambient temperature of 25 °C ± 5 °C.
7.2.4 Fit the test mounting block (6) into the test right in an inverted position (i.e. 180° from the position
shown in Figure 1).
1) 1 mm /s = 1 cSt.
2 © ISO 2008 – All rights reserved

7.2.5 Assemble the filter to be tested on the mounting block using a suitable gasket to prevent leakage
through the thread.
If the object of this test is to assess the performance of the valve only and not the integrity of the filter
assembly as a whole, the potential leak path between the threaded mounting
...