ISO 23551-1:2012

Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic and semi-automatic valves

ISO 23551-1:2012 specifies safety, constructional and performance requirements and testing of automatic and semi-automatic shut-off valves for gas burners, gas appliances and appliances of similar use. It applies to normally closed valves, valves being mounted upstream to gas burners and gas appliances, valves with declared maximum working pressures up to and including 500 kPa, for use on burners or in appliances using fuel gases as natural gas, manufactured gas or liquefied petroleum gas (LPG), valves directly or indirectly actuated, electrically or by mechanical means, valves actuated by hydraulic or pneumatic means, valves where the flow rate is controlled by external electrical signals, either in discrete steps or propor­tional to the applied signal, and valves fitted with closed position indicator switches. ISO 23551-1:2012 covers type testing only.

Dispositifs de commande et de sécurité pour brûleurs à gaz et appareils à gaz — Exigences particulières — Partie 1: Robinets automatiques et semi-automatiques

General Information

• Status: Published
• Publication Date: 07-Aug-2012
• ICS: 27.060.20 - Gas fuel burners
• Technical Committee: ISO/TC 161 - Controls and protective devices for gas and/or oil
• Drafting Committee: ISO/TC 161/WG 3 - Controls
• Current Stage: 9599 - Withdrawal of International Standard
• Due Date: 22-Nov-2024
• Completion Date: 22-Nov-2024

Relations

• Revised: ISO 23551-1:2024 - Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic and semi-automatic shut-off valves
• Effective Date: 06-Jun-2022
• Revises: ISO 23551-1:2006 - Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic valves
• Effective Date: 20-Apr-2009

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 23551-1
Second edition
2012-08-15
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 1:
Automatic and semi-automatic valves
Dispositifs de commande et de sécurité pour brûleurs à gaz et appareils
à gaz — Exigences particulières —
Partie 1: Robinets automatiques et semi-automatiques

Reference number
©
ISO 2012
©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword . v
Introduction . vi
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 2
4  Classification . 5
4.1  Classes of control . 5
4.2  Groups of controls . 5
5  Test conditions . 6
6  Construction . 6
6.1  General . 6
6.2  Construction requirements . 6
6.3  Materials . 9
6.4  Gas connections . 10
7  Performance . 11
7.1  General . 11
7.2  Leak-tightness . 12
7.3  Torsion and bending . 12
7.4  Rated flow rate . 13
7.5  Durability . 13
7.6  Functional requirements. 13
7.7  Endurance . 18
8  EMC/Electrical requirements . 22
8.1  Protection against environmental influences . 22
8.2  Variations in supply voltage . 22
8.3  Short-term voltage interruptions and drops . 22
8.4  Variations in supply frequency . 22
8.5  Surge immunity test . 22
8.6  Electrical fast transient/burst . 22
8.7  Immunity to conducted disturbances . 22
8.8  Immunity to radiated fields . 22
8.9  Electrostatic discharge immunity test . 22
8.10  Test for immunity to power-frequency magnetic field . 22
8.11  Electrical requirements . 22
8.101  Electrical components . 24
9  Marking, installation and operating instructions . 25
9.1  Marking . 25
9.2  Installation and operating instructions . 26
9.3  Warning notice . 26
Annex A (informative) Leak-tightness test - Volumetric method . 27
Annex B (informative) Leak-tightness test - pressure-loss method . 28
Annex C (normative) Conversion of pressure loss into leakage rate . 29
Annex D (normative) Test for immunity to power-frequency magnetic fields . 30
Annex E (normative) Specific regional requirements in European countries . 31
Annex F (normative) Specific regional requirements in Canada and the USA .32
F.1  General .32
F.2  Additional requirements and modifications .32
Annex G (normative) Specific regional requirements in Japan .34
G.1  General .34
G.2  Additional requirements and modifications .34
Bibliography .36

Figures
Figure 1 — Balanced valve with two ports. 8
Figure 2 — Balanced valve with one port . 9
Tables
Table 1 — Test pressure . 12
Table 2 — Sealing force requirements . 16
Table 3 — Operating cycles . 20
Table 4 — Operating cycles for automatic shut- off valves for cookers . 21
Table G.1 — Operating cycles . 35

iv © ISO 2012 – All rights reserved

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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 23551-1 was prepared by Technical Committee ISO/TC 161, Control and protective devices for gas
and/or oil burners and appliances.
This second edition cancels and replaces the first edition (ISO 23551-1:2006), which has been technically
revised. In particular, the following has been changed:
a) integration of non electrical requirements from IEC 60730-2-17;
b) integration of electrical requirements from IEC 60730-2-17 which are unalterable for valves;
c) introduction of further classifications for valves;
d) introduction of requirements and tests for balanced valves;
e) introduction of requirements and tests for valves containing electrical components in the gas way.
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
The following parts are under preparation:
 Part 5: Manual gas valves
 Part 6: Thermoelectric flame supervision devices
 Part 7: Pressure sensing devices
 Part 8: Multifunctional Controls
Introduction
This part of ISO 23551 is designed to be used in combination with ISO 23550. This part 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 subclauses 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.

vi © ISO 2012 – All rights reserved

INTERNATIONAL STANDARD ISO 23551-1:2012(E)

Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 1:
Automatic and semi-automatic valves
1 Scope
This part of ISO 23551 specifies safety, constructional and performance requirements and testing of automatic
and semi-automatic shut-off valves for gas burners, gas appliances and appliances of similar use.
It applies to
 normally closed valves,
 valves being mounted upstream to gas burners and gas appliances,
 valves with declared maximum working pressures up to and including 500 kPa, for use on burners or in
appliances using fuel gases as natural gas, manufactured gas or liquefied petroleum gas (LPG),
 valves directly or indirectly actuated, electrically or by mechanical means,
 valves actuated by hydraulic or pneumatic means,
 valves where the flow rate is controlled by
...