ISO 20766-7:2023

Road vehicles — Liquefied petroleum gas (LPG) fuel system components — Part 7: Remotely controlled service valve with excess flow valve

This document specifies general requirements and definitions of the liquefied petroleum gas fuel component: remotely controlled service valve with excess flow valve. This component is intended for use on the types of motor vehicles as defined in ISO 3833. It also provides general design principles and specifies requirements for instructions and marking. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of the ISO 20766 series, including testing to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document applies to device which have a service pressure in the range of 110 kPa (butane rich at 20 °C) and 840 kPa (propane rich at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).

Véhicules routiers —Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme combustible — Partie 7: Vanne de service télécommandée avec limiteur de débit

General Information

• Status: Published
• Publication Date: 05-Feb-2023
• 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/WG 6 - Fuel system components and refuelling connector for vehicles propelled by Liquefied Petroleum Gas (LPG)
• Current Stage: 6060 - International Standard published
• Start Date: 06-Feb-2023
• Due Date: 24-Jun-2022
• Completion Date: 06-Feb-2023

Standards Content (Sample)

ISO/DISFDIS 20766-7:20212022(E)
Date: 2022-01-1910-17
ISO TC 22/SC 41
Secretariat: UNI
Road vehicles — Liquefied petroleum gas (LPG) fuel system components —
Part 7: Remotely controlled service valve with excess flow valve

---------------------- Page: 1 ----------------------
ISO/DIS FDIS 20766--7:20212022(E)
© ISO 2021 2022
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-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: [e-mail]
Website: www.iso.org
Published in Switzerland.
ii © ISO 20212022 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 20766-7:2022(E)
Contents        Page
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly. 3
6 Tests . 4
6.1 Applicability . 4
6.2 Hydrostatic strength . 4
6.3 High temperature . 5
6.4 Low temperature . 5
6.5 Seat leakage test . 5
6.6 Continued operation (endurance test) . 6
6.7 Operation test for excess flow valve . 6
1 Scope . 4
2 Normative references . 4
3 Terms and definitions…. 5
4 Markings. 5
5 Construction and assembly. 5
6 Tests. 7
6.1 Applicability………………………………………………….…………………………………7
6.2 Hydrostatic strength………………………………………………………………………….7
6.3 High temperature……………………………………………………………………….……8
6.4 Low temperature…………………………………………………………………………….8
6.5 Seat leakage test……………………………………………………………………………….8
6.6 Continued operation (Endurance test)……………………………………………….9
6.7 Operation test for excess flow valve…………………………………………………10
© ISO 2022 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/DIS FDIS 20766--7:20212022(E)
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 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 22, Road vehicles, Subcommittee
SC 41, Specific aspects for gaseous fuels.
A list of all parts in the ISO 20766 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 © ISO 20212022 – All rights reserved

---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20766-7:2022(E)

Road vehicles — Liquefied petroleum gas (LPG) fuel system components — Part 7:
Remotely controlled service valve with excess flow valve
1 Scope
This document specifies general requirements and definitions of the liquefied petroleum gas
fuel component: remotely -controlled service valve with excess flow valve. This component of
liquefied petroleum gas fuel,is intended for use on the types of motor vehicles as defined in
ISO 3833. It also provides general design principles and specifies requirements for instructions
and marking.
This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using
gaseous fuels in accordance with ISO 9162. It is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refuelling receptacles.
It is recognized that miscellaneous components not specifically addressed herein can be
examined for compliance with the criteria of any applicable part of the ISO 20766 series,
including testing to the appropriate functional tests.
All references to pressure in this document are considered gauge pressures unless otherwise
specified.
This document applies to device which have a service pressure in the range of 110 kPa (butane
rich at 20 °C) and 840 kPa (propane rich at 20 °C), hereinafter referred to in this document.
Other service pressures can be accommodated by adjusting the pressure by the appropriate
factor (ratio).
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 20766--1:2018, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components —
Part 1: General requirements and definitions
ISO 20766--2, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 2:
Performance and general test methods
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in in ISO 20766-1 and the
following apply.
© ISO 2022 – All rights reserved 1

---------------------- Page: 5 ----------------------
ISO/FDIS 20766-7:2022(E)
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
commanded stop
period of time during which the combustion engine is switched off automatically for fuel saving
and is allowed to start again automatically
4 Markings
The remotely controlled service valve with excess flow valve shall bear, the following clearly
legible and indelible identification markings consisting of characters, figures or symbols:
a) the manufacturer’s or agent’s name, trademark or symbol;
b) the model designation (part number);
c) the working pressure and temperature range;
d) the year and month of fabrication;
e) the rated closing flow capacity.
The following additional markings are recommended:
— the direction of flow (when necessary for correct installation);
— the type of fuel;
— electrical ratings (if applicable);
— the symbol of the certification agency;
— the type approval number;
— the serial number or date code;
— a reference to this document, i.e. ISO 20766-7.
NOTE This information can be provided by a suitable identification code on at least one part of the
component when it consists of more than one part.
In addition to the markings specified above, if the valve is compatible with start/stop systems,
one of the following additional marks shall be used for automatic cylinder valves:
— “H1” if the valve is to be used with an engine that shuts off automatically when the vehicle
comes to a halt;
— “H2” if the valve is to be used with an engine that, in addition to a), it also shuts off
automatically when the vehicle drives with an electric motor only;
— “H3” if the valve is to be used with an engine that, in addition to a) or b), it also shuts off
automatically when the accelerator pedal is released.
2 © ISO 2022 – All rights reserved

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ISO/DIS FDIS 20766--7:20212022(E)
5 Construction and assembly
5.1 The remotely controlled service valve with excess flow valve shall be designed to withstand
the maximum operating pressure as applicable.
5.2 The remotely controlled service valve with excess flow valve shall be designed to withstand
a temperature between the minimum operating temperature and maximum operating
temperature in ISO 20766-1:2018, Table 1.
5.3 In order to prevent electrical sparking in case of fracture of the component, the electrically
operated remotely controlled service valve with excess flow valve shall:
a) be insulated in a manner that no current is lead through LPG containing parts;
b) have the electrical system of the device isolated from the body.
IsolationThe isolation resistance shall be > 10MΩ10 MΩ.
5.4 In the case where a remotely controlled service valve with excess flow valve is activated by
an electric/external power, the valve shall be in “closed” position when its power is switched
off.
5.5 The remotely controlled service valve with exce
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20766-7
ISO/TC 22/SC 41
Road vehicles — Liquefied petroleum
Secretariat: UNI
gas (LPG) fuel system components —
Voting begins on:
2022-11-01
Part 7:
Voting terminates on:
Remotely controlled service valve with
2022-12-27
excess flow valve
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20766-7:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 1 ----------------------
ISO/FDIS 20766-7:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20766-7
ISO/TC 22/SC 41
Road vehicles — Liquefied petroleum
Secretariat: UNI
gas (LPG) fuel system components —
Voting begins on:
Part 7:
Voting terminates on:
Remotely controlled service valve with
excess flow valve
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20766-7:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2022 – All rights reserved
NATIONAL REGULATIONS. © ISO 2022

---------------------- Page: 2 ----------------------
ISO/FDIS 20766-7:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly .2
6 Tests . 4
6.1 Applicability . 4
6.2 Hydrostatic strength . 4
6.3 High temperature . . 4
6.4 Low temperature . 4
6.5 Seat leakage test . 4
6.6 Continued operation (endurance test) . 5
6.7 Operation test for excess flow valve . 6
Bibliography . 8
iii
© ISO 2022 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 20766-7:2022(E)
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 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 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
A list of all parts in the ISO 20766 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
  © ISO 2022 – All rights reserved

---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20766-7:2022(E)
Road vehicles — Liquefied petroleum gas (LPG) fuel system
components —
Part 7:
Remotely controlled service valve with excess flow valve
1 Scope
This document specifies general requirements and definitions of the liquefied petroleum gas fuel
component: remotely controlled service valve with excess flow valve. This component is intended for
use on the types of motor vehicles as defined in ISO 3833. It also provides general design principles and
specifies requirements for instructions and marking.
This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels
in accordance with ISO 9162. It is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refuelling receptacles.
It is recognized that miscellaneous components not specifically addressed herein can be examined
for compliance with the criteria of any applicable part of the ISO 20766 series, including testing to the
appropriate functional tests.
All references to pressure in this document are considered gauge pressures unless otherwise specified.
This document applies to device which have a service pressure in the range of 110 kPa (butane rich
at 20 °C) and 840 kPa (propane rich at 20 °C), hereinafter referred to in this document. Other service
pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
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 20766-1:2018, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 1:
General requirements and definitions
ISO 20766-2, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 2:
Performance and general test methods
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in in ISO 20766-1 and the following
apply.
1
© ISO 2022 – All rights reserved

---------------------- Page: 5 ----------------------
ISO/FDIS 20766-7:2022(E)
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
commanded stop
period of time during which the combustion engine is switched off automatically for fuel saving and is
allowed to start again automatically
4 Markings
The remotely controlled service valve with excess flow valve shall bear, the following clearly legible
and indelible identification markings consisting of characters, figures or symbols:
a) the manufacturer’s or agent’s name, trademark or symbol;
b) the model designation (part number);
c) the working pressure and temperature range;
d) the year and month of fabrication;
e) the rated closing flow capacity.
The following additional markings are recommended:
— the direction of flow (when necessary for correct installation);
— the type of fuel;
— electrical ratings (if applicable);
— the symbol of the certification agency;
— the type approval number;
— the serial number or date code;
— a reference to this document, i.e. ISO 20766-7.
NOTE This information can be provided by a suitable identification code on at least one part of the component
when it consists of more than one part.
In addition to the markings specified above, if the valve is compatible with start/stop systems, one of
the following additional marks shall be used for automatic cylinder valves:
— “H1” if the valve is to be used with an engine that shuts off automatically when the vehicle comes to
a halt;
— “H2” if the valve is to be used with an engine that, in addition to a), it also shuts off automatically
when the vehicle drives with an electric motor only;
— “H3” if the valve is to be used with an engine that, in addition to a) or b), it also shuts off automatically
when the accelerator pedal is released.
5 Construction and assembly
5.1 The remotely controlled service valve with excess flow valve shall be designed to withstand the
maximum operating pressure as applicable.
2
  © ISO 2022 – All rights reserved

---------------------- Page: 6 ----------------------
ISO/FDIS 20766-7:2022(E)
5.2 The remotely controlled service valve with excess flow valve shall be designed to withstand a
temperature between the minimum operating temperature and maximum operating temperature in
ISO 20766-1:2018, Table 1.
5.3 In order to prevent electrical sparking in case of fracture of the component, the electrically
operated remotely controlled service valve with excess flow valve shall:
a) b
...