ISO 24163-2:2024

International
Standard
ISO 24163-2
First edition
Clamp-in tyre valves for tyre
2024-01
pressure monitoring systems —
Part 2:
Test methods and performance
Valves à visser pour système de contrôle de la pression des
pneus —
Partie 2: Méthodes d’essai et exigences de performance
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test fixture and valve hole dimensions . 2
5 Test methods and performance requirements . 3
5.1 General .3
5.1.1 Appearance .3
5.1.2 Operating pressure .3
5.1.3 Installation procedure .3
5.1.4 Samples .3
5.2 Leakage test method .3
5.3 Valve core tests .5
5.3.1 Valve core specification for leakage tests .5
5.3.2 Valve core room temperature leakage test .5
5.3.3 Valve core low temperature leakage test .5
5.3.4 Valve core high temperature leakage test .5
5.3.5 Valve core over torque resistance test .6
5.3.6 Valve core endurance test .6
5.3.7 Valve core air flow rate test .7
5.4 Valve cap seal .7
5.4.1 Room temperature test (optional, for sealing caps only) .7
5.5 Valve to rim seal .8
5.5.1 Valve to rim seal leakage test — General .8
5.5.2 Valve to rim seal low temperature leakage test .8
5.5.3 Valve to rim seal high temperature leakage test .8
5.5.4 Valve to rim seal peak temperature leakage test .9
5.6 Valve mechanical resistance .9
5.6.1 Over torque nut test . .9
5.6.2 High pressure test .9
5.6.3 Radial force resistance (nose resistance) .9
5.7 Environmental resistance .11
5.7.1 Ozone test .11
5.7.2 Neutral salt spray (NSS) test . 12

iii
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
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
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rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 31, Tyres, rims and valves, Subcommittee SC 9,
Valves for tube and tubeless tyres.
A list of all parts in the ISO 24163 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
International Standard ISO 24163-2:2024(en)
Clamp-in tyre valves for tyre pressure monitoring systems —
Part 2:
Test methods and performance
1 Scope
This document specifies test methods for clamp-in tyre valves for tyre pressure monitoring systems
(TPMSs).
These methods are defined to determine the minimum level of performance requested.
This document applies to the tyre valve assembled on the rim hole with diameter of 11,3 mm for passenger
cars or for light duty vehicles.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 3877-2, Tyres, valves and tubes — List of equivalent terms — Part 2: Tyre valves
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ISO 9413, Tyre valves — Dimensions and designation
ISO 14960-2, Tubeless tyres — Valves and components — Part 2: Clamp-in tubeless tyre valve-test method
ISO 24163-1, Tyre valves — Clamp-in tyre valves for tyre pressure monitoring systems — Part 1: Definition,
types, dimensions and valve interface
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3877-2, ISO 9413, ISO 24163-1,
ISO 14960-2 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
clamp-in tyre valve
valve for tubeless tyre, designed to be used with a valve core, a cap, an O-ring or a rubber grommet and to be
fixed with a hex nut and potentially a ring washer
3.2
tyre pressure monitoring system
TPMS
system which directly monitors the tyre pressure and which alerts in case of under pressure

3.3
valve assembly
clamp-in tyre pressure monitoring system (TPMS) (3.2) valve (with a valve core, a cap, a nut, an O-ring or a
rubber grommet and potentially a washer) fixed on the test fixture
4 Test fixture and valve hole dimensions
For each test, the material and the test fixture should be representative of the actual rim.
Break both edges on both sides of the valve hole either by a 45° chamfer or a radius from 0,3 mm to 0,4 mm.
Emery cloth or suitable tooling is recommended. The material of rim or fixture shall be aluminium alloy or
steel.
Unless otherwise stated, for all the tests, the conditions in Table 1 shall be applied for the installation of the
valve.
Table 1 — Test Fixture
Nominal hole diameter
11,3 mm
Test
Test hole diameter Test plate thickness
mm mm
Valve to rim seal leakage tests (see 5.5) Specific fixture, see 5.5
+0
Over torque nut test (see 5.6.1) 3,5 ± 0,05
11,7
−00, 5
+0
High pressure test (see 5.6.2) 3,5 ± 0,05
11,7
−00, 5
+00, 5
Radial force resistance (see 5.6.3) 3,5 ± 0,05
11,3
−0
Ozone test on seal alone:
Ozone test on seal alone:
Specific fixture, see 5.7.1
Specific fixture, see 5.7.1
Ozone test on complete valve
Ozone test (see 5.7.1) Ozone test on complete valve
assembly:
assembly:
+00, 5
3,5 ± 0,05
11,3
−0
+00, 5
Neutral salt spray test (see 5.7.2) 3,5 ± 0,05
11,3
−0
As described in ISO 9413 and ISO 24163-1, several types of clamp-in valves exist.
Furthermore, several types of tyre pressure monitoring systems (TPMSs) exist and this document does not
consider the attachment system between valve and sensor housing.
In this document a simplified illustration of a TPMS clamp-in valve is used (Figure 1).
Key
1 TPMS
Figure 1 — Simplified representation of a TPMS clamp-in valve

5 Test methods and performance requirements
5.1 General
5.1.1 Appearance
If not otherwise defined between customer and supplier:
— Valve external aspect: no visible valve crack, spot or scratch is allowed. No visible defect of the anodizing
layer is allowed. No deep marks coming from shocks or machining are allowed. All these defects can be
judged with naked eye at 1 m distance in final configuration (valve assembled on rim).
— Sealing element aspect shall be uniform; no bubble, no rubber lack, no visible crack or any other defect
that will affect
...