ISO 12619-11:2017

INTERNATIONAL ISO
STANDARD 12619-11
First edition
2017-08
Road vehicles — Compressed gaseous
hydrogen (CGH2) and hydrogen/
natural gas blends fuel system
components —
Part 11:
Excess flow valve
Véhicules routiers — Composants des circuits d’alimentation pour
hydrogène gazeux comprimé (CGH2) et mélanges de gaz naturel et
hydrogène —
Partie 11: Valve de limitation de débit
Reference number
©
ISO 2017
© ISO 2017, Published in Switzerland
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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 . 3
6 Tests . 3
6.1 Applicability . 3
6.2 Hydrostatic strength . 3
6.3 Leakage . 4
6.4 Excess torque resistance . 4
6.5 Bending moment . 4
6.6 Continued operation . 4
6.7 Operation . 4
6.8 Pressure impulse . 4
Bibliography . 6
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
A list of all parts in the ISO 12619 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 12619-11:2017(E)
Road vehicles — Compressed gaseous hydrogen
(CGH2) and hydrogen/natural gas blends fuel system
components —
Part 11:
Excess flow valve
1 Scope
This document specifies tests and requirements for the excess flow valve, a compressed gaseous
hydrogen (CGH ) and hydrogen/natural gas blend fuel system component intended for use on the types
of motor vehicles defined in ISO 3833.
It is applicable to vehicles using CGH in accordance with ISO 14687-1 or ISO 14687-2 and
hydrogen/natural gas blend using natural gas in accordance with ISO 15403-1 and ISO/TR 15403-2. It
is not applicable to the following:
a) liquefied hydrogen (LH ) fuel system components;
b) fuel containers;
c) stationary gas engines;
d) container mounting hardware;
e) electronic fuel management;
f) refuelling receptacles;
g) fuel cell vehicles.
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 considered gauge pressures unless otherwise
specified.
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 editi
...