ISO 24163-2:2024

Clamp-in tyre valves for tyre pressure monitoring systems - Part 2: Test methods and performance

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.

Valves à visser pour système de contrôle de la pression des pneus — Partie 2: Méthodes d’essai et exigences de performance

General Information

• Status: Published
• Publication Date: 08-Jan-2024
• ICS: 83.160.01 - Tyres in general
• Technical Committee: ISO/TC 31/SC 9 - Valves for tube and tubeless tyres
• Drafting Committee: ISO/TC 31/SC 9 - Valves for tube and tubeless tyres
• Current Stage: 6060 - International Standard published
• Start Date: 09-Jan-2024
• Due Date: 01-Jul-2023
• Completion Date: 09-Jan-2024

Overview

ISO 24163-2:2024 specifies test methods and minimum performance requirements for clamp-in tyre valves used with tyre pressure monitoring systems (TPMS). It covers valves assembled on rim holes of 11.3 mm diameter for passenger cars and light-duty vehicles. The standard defines how to evaluate valve core leakage, valve-to-rim sealing, mechanical resistance and environmental durability to ensure TPMS valves meet consistent safety and reliability criteria.

Key topics and technical requirements

• Scope and installation
  • Applies to clamp-in TPMS valves for rim holes of 11.3 mm.
  • Installation procedures and torques follow ISO 24163-1 unless otherwise stated.
  • Test fixtures and rim-hole edges require a 45° chamfer or 0.3–0.4 mm radius; rim material representative of real rims (aluminium alloy or steel).
• Leakage testing
  • Immersion-based leakage tests with valve mouth orientation defined for core vs rim leakage; immersion depth ≤ 100 mm.
  • Documented leakage limit: 0.2 cm/min (equivalent examples given in the standard: ~14 bubbles/min at 3 mm diameter or ~1 bubble/min at ~7 mm).
  • Tests include room temperature, low temperature (after −40 °C exposure) and high temperature (after 100 °C exposure).
• Valve core requirements
  • Pin height tolerance and specified torques for metallic and non-metallic sealing cores.
  • Tests: room/low/high temperature leakage, over-torque resistance, endurance and air flow rate.
• Valve-to-rim seal
  • Dedicated leakage procedures at varying temperatures, including a peak temperature test.
• Mechanical resistance
  • Over-torque nut test, high-pressure test (nominal operating pressure 0–830 kPa; maximal operating pressure up to 1 400 kPa), radial (nose) force resistance.
• Environmental resistance
  • Ozone exposure and neutral salt spray (NSS) corrosion testing per ISO 9227.
• Sampling and appearance
  • Minimum representative sample quantity recommended (usually ≥5); visual acceptance criteria for external appearance and sealing elements.

Applications and who uses it

ISO 24163-2:2024 is intended for:

• TPMS valve manufacturers and component suppliers (design validation and production quality control)
• Automotive OEMs and wheel/rim manufacturers (component specification and supplier verification)
• Certification and testing laboratories (type approval, conformity testing)
• Quality, safety and regulatory teams ensuring compliance with TPMS performance and durability expectations

Related standards

• ISO 24163-1 (definition, types, dimensions and valve interface)
• ISO 9413 (tyre valve dimensions)
• ISO 14960-2 (clamp-in tubeless valve test methods)
• ISO 9227 (neutral salt spray)
• ISO 3877-2 (tyre valve terminology)

Using ISO 24163-2 helps ensure clamp-in TPMS valves deliver consistent leakage performance, mechanical robustness and environmental durability-key for vehicle safety and reliable tyre-pressure monitoring.

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
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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has been established has the right to be represented on that committee. International organizations,
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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
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
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Any trade name used in this document is information given for the convenience of users and does not
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
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
...