ISO 23551-5:2014

INTERNATIONAL ISO
STANDARD 23551-5
First edition
2014-05-01
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 5:
Manual gas valves
Dispositifs de commande et de sécurité pour brûleurs à gaz et
appareils à gaz — Exigences particulières —
Partie 5: Robinets de gaz manuels
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classes of control. 2
4.1 Classes of controls . 2
4.2 Groups of controls . 3
5 Test conditions . 3
6 Construction . 3
6.1 General . 3
6.2 Construction requirements . 3
6.3 Materials . 4
6.4 Gas connections . 5
6.102 Appliance connector valves . 7
7 Performance . 8
7.1 General . 8
7.2 Leak-tightness. 8
7.3 Torsion and bending . 8
7.4 Rated flow rate . 8
7.5 Durability . 9
7.6 Functional requirements: Operating torque and force . 9
7.7 Endurance .13
8 EMC/Electrical requirements .15
9 Marking, installation and operating instructions .15
9.1 Marking .15
9.2 Installation and operating instructions .16
9.3 Warning notice .17
Annex A (informative) Leak-tightness test — Volumetric method .18
Annex B (informative) Leak-tightness test — Pressure-loss method .19
Annex C (normative) Conversion of pressure loss into leakage rate .20
Annex D (normative) Test for immunity to power-frequency magnetic fields.21
Annex E (normative) Specific regional requirements in European countries .22
Annex F (normative) Specific regional requirements in Canada and USA .23
Annex G (normative) Specific regional requirements in Japan .25
Annex AA (informative) Examples of manual gas shut-off valves.26
Bibliography .33
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. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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to Trade (TBT), see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 161, Control and protective devices for gas and oil
burners and gas and oil burning appliances.
ISO 23551 consists of the following parts, under the general title Safety and control devices for gas burners
and gas-burning appliances — Particular requirements:
— Part 1: Automatic and semi-automatic valves
— Part 2: Pressure regulators
— Part 3: Gas/air ratio controls, pneumatic type
— Part 4: Valve-proving systems for automatic shut-off valves
— Part 5: Manual gas valves
— Part 6: Thermoelectric flame supervision controls
iv © ISO 2014 – All rights reserved

Introduction
This part of ISO 23551 is designed to be used in combination with ISO 23550. This part of ISO 23551
together with ISO 23550 establishes the full requirements as they apply to the product covered by
this International Standard. This part adapts ISO 23550, where needed, by stating “with the following
modification”, “with the following addition”, “is replaced by the following” or “is not applicable”, in the
corresponding Clause. In order to identify specific requirements that are particular to this part, that are
not already covered by ISO 23550, this document may contain Clauses or Sub-clauses that are additional
to the structure of ISO 23550. These Clauses are numbered starting from 101 or, in the case of an Annex,
are designated AA, BB, CC etc.
In an attempt to develop a full International Standard, it has been necessary to take into consideration
the differing requirements resulting from practical experience and installation practices in various
regions of the world and to recognize the variation in basic infrastructure associated with gas and/or oil
controls and appliances, some of which are addressed in Annexes E, F and G. This International Standard
intends to provide a basic framework of requirements that recognize these differences.
INTERNATIONAL STANDARD ISO 23551-5:2014(E)
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 5:
Manual gas valves
1 Scope
This part of ISO 23551 specifies safety, constructional and performance requirements for manual gas
valves intended for use with gas burners and gas-burning appliances, hereafter referred to as ‘valves’,
unless otherwise specified.
This International Standard applies to following types of manual gas valves:
— manual gas shut-off valve;
— gas burner valve;
— appliance connector valve;
— “delta C” valve.
This part of ISO 23551 applies to valves for gas burners and gas-burning appliances of nominal connection
size up to and including DN 100 that can be used and tested independently of these appliances using fuel
gases, as natural gas, manufactured gas or liquefied petroleum gas (LPG) at inlet pressures up to and
including 500 kPa. It is not applicable to corrosive and waste gases.
This International Standard covers type testing only.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 23550:2011, Safety and control devices for gas burners and gas-burning appliances — General
requirements
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 23550 and the following apply.
3.101
manual gas shut-off valve
manually operated valve for the control of the gas flow from an “off” to an “on” position and vice versa
Note 1 to entry: Parts commonly used in manual gas shut-off valves are shown as examples in Figures AA.1 to
AA.5.
3.102
“delta C” valve
manual gas valve suitable for use on food service equipment (commercial cooking equipment)
Note 1 to entry: These valves are identified by a “delta C” marking.
3.103
gas burner valve
manual gas valve that requires user initiation of each usage cycle
Note 1 to entry: This type of manual gas valve is intended to be used in Canada and the US between the gas supply
piping and the gas burner.
Note 2 to entry: The valve is turned on when the burner operating cycle is initiated and turned off when the
burner operating cycle is completed.
3.104
appliance connector valve
manual gas valve having a non-displaceable valve member, a minimum specified capacity and a
...