ISO 12619-6:2017

Road vehicles - Compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blends fuel system components - Part 6: Automatic valve

ISO 12619-6:2017 specifies tests and requirements for the automatic valve, a compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blends fuel system component intended for use on the types of motor vehicles defined in ISO 3833. It is applicable to vehicles using compressed gaseous hydrogen (CGH2) in accordance with ISO 14687‑1 or ISO 14687‑2 and hydrogen/natural gas blends using natural gas in accordance with ISO 15403‑1 and ISO/TR 15403‑2. It is not applicable to the following: a) liquefied hydrogen (LH2) fuel system components; b) fuel containers; c) stationary gas engines; d) container mounting hardware; e) electronic fuel management; f) refuelling receptacles. NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. NOTE 2 All references to pressure in this document are to be considered gauge pressures unless otherwise specified. NOTE 3 This document may not apply to fuel cell vehicles in compliance with international regulations.

Véhicules routiers — Composants des circuits d'alimentation pour hydrogène gazeux comprimé (CGH2) et mélanges de gaz naturel et hydrogène — Partie 6: Valve automatique

General Information

• Status: Published
• Publication Date: 02-Mar-2017
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/JWG 5 - Joint ISO/TC 22/SC 41 - ISO/TC 197 WG: Fuel system components and refuelling connector for vehicles propelled by blends of natural gas and hydrogen
• Current Stage: 9093 - International Standard confirmed
• Start Date: 12-Jul-2023
• Completion Date: 13-Dec-2025

Relations

• Consolidated By: ISO 6888-2:2021 - Microbiology of the food chain - Horizontal method for the enumeration of coagulase-positive staphylococci (Staphylococcus aureus and other species) - Part 2: Method using rabbit plasma fibrinogen agar medium
• Effective Date: 06-Jun-2022

Overview

ISO 12619-6:2017 specifies tests and requirements for the automatic valve used in compressed gaseous hydrogen (CGH2) and hydrogen/natural gas (H/NG) blend vehicle fuel systems. Intended for motor vehicles defined in ISO 3833, the standard focuses on component safety, leakage control, electrical insulation and long-term operation under representative service conditions. It is applicable to vehicles using CGH2 (ISO 14687-1/2) and H/NG blends (ISO 15403-1, ISO/TR 15403-2) and excludes LH2 components, fuel containers, stationary engines, mounting hardware, electronic fuel management and refuelling receptacles.

Key Topics

• Scope and applicability: Defines the automatic valve (on/off valve not manually operated) and clarifies excluded items and gauge-pressure conventions.

• Marking requirements: Components must be traceable. Markings should include:

  • Manufacturer name or trademark
  • Model/part number
  • Working pressure (and temperature range if applicable)
  • Fuel type
  • Recommended additional markings: endurance category (H1/H2/H3), flow direction, electrical ratings, certification symbol, approval number, serial/date code and reference to ISO 12619-6.

• Construction and assembly: Valves shall comply with ISO 12619-1 and ISO 12619-2. All automatic valves (including solenoids and cylinder-mounted valves) must be closed when de-energized. Valves with manual by-pass must meet minimum requirements.

• Required tests: The document defines functional and durability tests (see Key Tests below) to verify safety and performance when exposed to CGH2 or H/NG blends.

Key Tests (selected)

• Hydrostatic strength: Test at 2.5 × working pressure per ISO 12619-2.
• Leakage: Evaluated across specified temperatures and pressure factors to confirm containment integrity.
• Continued operation (endurance): Cyclic operation tests per ISO 12619-2; base procedure is 50 000 cycles, with extended requirements marked H1 (200 000), H2 (500 000) and H3 (1 000 000) depending on vehicle engine shutdown strategies. Valves must pass leakage and hydrostatic tests after cycling.
• Insulation resistance: Apply 1 000 V DC between coil pin and housing; minimum resistance 240 kΩ. Electrically-operated valves intended for gas-tight housings must be intrinsically safe per IEC 60079-10-1.
• Minimum opening voltage: ≤8 V for 12 V systems and ≤16 V for 24 V systems at ≥0.75 × WP.
• Pressure impulse: Withstand 100 instantaneous pressure pulses to evaluate resistance to rapid filling or sudden pressurization.

Applications

ISO 12619-6:2017 is used by:

• Component manufacturers validating automatic valve designs for CGH2 and H/NG vehicle applications
• Vehicle OEMs and integrators specifying fuel system safety and durability
• Test labs performing conformity and type-approval testing

Benefits include improved safety, documented leak control, verified electrical insulation and proven durability under real-world operating scenarios.

Related Standards

• ISO 12619-1 (general requirements and definitions)
• ISO 12619-2 (performance and test methods)
• ISO 3833 (vehicle types)
• ISO 14687-1 / ISO 14687-2 (hydrogen fuel quality)
• ISO 15403-1 / ISO/TR 15403-2 (natural gas fuel quality)
• IEC 60079-10-1 (explosive atmosphere classification)

For manufacturers and test houses, ISO 12619-6:2017 provides a practical framework to demonstrate that automatic valves for hydrogen and hydrogen/NG blends meet safety, leakage and durability expectations required for road vehicle service.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 12619-6
First edition
2017-02
Road vehicles — Compressed gaseous
hydrogen (CGH2) and hydrogen/
natural gas blend fuel system
components —
Part 6:
Automatic valve
Véhicules routiers — Composants des circuits d’alimentation pour
hydrogène gazeux comprimé (CGH2) et mélanges de gaz naturel et
hydrogène —
Partie 6: Valve automatique
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . 2
5 Construction and assembly . 2
6 Tests . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
6.5 Insulation resistance . 4
6.6 Minimum opening voltage . 4
6.7 Pressure impulse . 4
Bibliography . 6
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.
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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on 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 the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific aspects for
gaseous fuels.
A list of all the parts in the ISO 12619 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 12619-6:2017(E)
Road vehicles — Compressed gaseous hydrogen
(CGH2) and hydrogen/natural gas blend fuel system
components —
Part 6:
Automatic valve
1 Scope
This document specifies tests and requirements for the automatic valve, a compressed gaseous
hydrogen (CGH2) and hydrogen/natural gas blends fuel system component intended for use on the
types of motor vehicles defined in ISO 3833.
It is applicable to vehicles using compressed gaseous hydrogen (CGH2) in accordance with ISO 14687-1
or ISO 14687-2 and hydrogen/natural gas blends using natural gas in accordance with ISO 15403-1 and
ISO/TR 15403-2. It is not applicable to the following:
a) liquefied hydrogen (LH2) fuel system components;
b) fuel containers;
c) stationary gas engines;
d) container mounting hardware;
e) electronic fuel management;
f) refuelling receptacles.
NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to
meet the criteria of this document and tested according to the appropriate functional tests.
NOTE 2 All references to pressure in this document are to be considered gauge pressures unless otherwise
specified.
NOTE 3 This document may not apply to fuel cell vehicles in compliance with international regulations.
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 12619-1, Road vehicles — Compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blend fuel
system components — Part 1: General requirements and definitions
ISO 12619-2, Road vehicles — Compressed gaseous h
...