ISO 23551-10:2016

Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 10: Vent valves

ISO 23551-10:2016 specifies the safety, design, construction and performance requirements and testing for automatic vent valves (hereafter referred to as "valves") for use with gas burners, gas appliances burning one or more gaseous fuels. It is applicable to valves with declared maximum inlet pressures up to and including 500 kPa (5 bar) of nominal connection sizes up to and including DN 100 (4"). It is applicable to - normally open valves, - electrically operated valves and to valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to any external devices for switching the control signal or actuating energy, and - valves fitted with open position indicator switches. It is not applicable to - valves for burners and appliances using renewables and/or waste gases (i.e. gases having corrosive characteristics), In case valves are in contact with renewables and/or waste gases, it is recommend to use ISO 23551-10:2016 only if explicit information is provided and relevant test methods and requirements are specified. - valves for appliances intended to be installed in the open air and exposed to the outdoor environment, - valves that are connected directly to mains pipe-work or to a container that maintains a standard distribution pressure, and - valves suitable with oil. It is applicable to type testing only.

Dispositifs de commande et de sécurité pour brûleurs à gaz et appareils à gaz — Exigences particulières — Partie 10: Robinets d'évent

General Information

• Status: Published
• Publication Date: 17-Jul-2016
• 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: 9092 - International Standard to be revised
• Completion Date: 22-Aug-2022

Relations

• Consolidated By: ISO 12312-1:2022 - Eye and face protection — Sunglasses and related eyewear — Part 1: Sunglasses for general use
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 23551-10
First edition
2016-08-01
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 10:
Vent valves
Dispositifs de commande et de sécurité pour brûleurs à gaz et
appareils à gaz — Exigences particulières —
Partie 10: Robinets d’évent
Reference number
ISO 23551-10:2016(E)
©
ISO 2016

---------------------- Page: 1 ----------------------
ISO 23551-10:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, 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 2016 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 23551-10:2016(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 3
4.1 Classes of controls . 3
4.2 Groups of controls . 3
5 Test conditions . 3
6 Construction . 3
6.1 General . 3
6.2 Construction requirements . 3
6.2.1 Appearance . 3
6.2.2 Holes . 3
6.2.3 Breather holes . 3
6.2.4 Screwed fastenings . 3
6.2.5 Jointing . 3
6.2.6 Moving parts . 4
6.2.7 Sealing caps . 4
6.2.8 Dismantling and reassembling for servicing and/or adjustment . 4
6.2.9 Auxiliary channels . 4
6.2.10 Open position indicator switch . 4
6.2.11 Controls assembled to a valve . 4
6.3 Materials . 4
6.3.1 General material requirements . 4
6.3.2 Housing . 4
6.3.3 Springs . 4
6.3.4 Resistance to corrosion and surface protection . 4
6.3.5 Impregnation . 5
6.3.6 Seals for glands for moving parts . 5
6.3.7 Closure member . 5
6.4 Gas connections . 5
6.4.1 Making connections . 5
6.4.2 Connection sizes . 5
6.4.3 Threads . 5
6.4.4 Union joints . 5
6.4.5 Flanges . 5
6.4.6 Compression fittings . . . 5
6.4.7 Nipples for pressure tests . 5
6.4.8 Strainers . 5
6.4.9 Pneumatic and hydraulic actuating mechanisms . 5
7 Performance . 6
7.1 General . 6
7.2 Leak-tightness. 6
7.2.1 Criteria . 6
7.2.2 Test for leak-tightness . 6
7.3 Torsion and bending . 6
7.4 Rated flow rate . 6
7.5 Durability . 6
7.6 Functional requirements . 6
7.6.1 Requirement . 6
7.6.2 Test of opening function . 7
© ISO 2016 – All rights reserved iii

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ISO 23551-10:2016(E)

7.7 Endurance . 7
7.7.1 Requirement . 7
7.7.2 Endurance test . 7
7.7.3 Endurance test for open position indicator switch . 8
7.8 Opening force . 8
7.8.1 Requirement . 8
7.8.2 Test of opening force . 8
7.9 Opening time . 8
7.9.1 Requirement . 8
7.9.2 Test of opening time . . 8
7.10 Delay time and closing time . 8
7.10.1 Requirement . 8
7.10.2 Test of delay time and closing time . 9
7.11 Open position indicator switch . 9
7.11.1 Requirement . 9
7.11.2 Test of open position indicator switch . 9
8 EMC/Electrical requirements . 9
9 Marking, installation and operating instructions . 9
9.1 Marking . 9
9.2 Installation and operating instructions . 9
9.3 Warning notice .10
Annex A (informative) Leak-tightness test — Volumetric method .11
Annex B (informative) Leak-tightness test — Pressure-loss method .12
Annex C (normative) Conversion of pressure loss into leakage rate .13
Annex D (normative) Test for immunity to power-frequency magnetic fields.14
Annex E (normative) Specific regional requirements in European countries .15
Annex F (normative) Specific regional requirements in Canada and USA .16
Annex G (normative) Specific regional requirements in Japan .17
Bibliography .18
iv © ISO 2016 – All rights reserved

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ISO 23551-10:2016(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 on 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: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 161, Control and protective devices for gas
and/or oil burners and appliances.
A list of all parts in the ISO 23551 series, published under the general title Safety and control devices for
gas burners and gas-burning appliances — Particular requirements, can be found on the ISO website.
© ISO 2016 – All rights reserved v

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ISO 23551-10:2016(E)

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
part of ISO 23551. This part of ISO 23551 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 of
ISO 23551 that are not already covered by ISO 23550, this part of ISO 23551 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 part of ISO 23551
intends to provide a basic framework of requirements that recognize these differences.
vi © ISO 2016 – All rights reserved

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INTERNATIONAL STANDARD ISO 23551-10:2016(E)
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 10:
Vent valves
1 Scope
This part of ISO 23551 specifies the safety, design, construction and performance requirements and
testing for automatic vent valves (hereafter referred to as “valves”) for use with gas burners, gas
appliances burning one or more gaseous fuels.
This part of ISO 23551 is applicable to valves with declared maximum inlet pressures up to and
including 500 kPa (5 bar) of nominal connection sizes up to and including DN 100 (4”).
This part of ISO 23551 is applicable to
— normally open valves,
— electrically operated valves and to valves actuated by fluids where the control valves for these
fluids are actuated electrically, but not to any external devices for switching the control signal or
actuating energy, and
— valves fitted with open position indicator switches.
This part of ISO 23551 is not applicable to
— valves for burners and appliances using renewables and/or waste gases (i.e. gases having corrosive
characteristics),
In case valves are in contact with renewables and/or waste gases, it is recommend to use this part
of ISO 23551 only if explicit informati
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 23551-10
ISO/TC 161 Secretariat: DIN
Voting begins on: Voting terminates on:
2015-10-22 2016-01-22
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 10:
Vent valves
Titre manque
ICS:
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 23551-10:2015(E)
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 SUPPORTING DOCUMENTATION. ISO 2015

---------------------- Page: 1 ----------------------
ISO/DIS 23551-10:2015(E) ISO/DIS 23551-10

Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 3
4.1 Classes of controls . 3
4.2 Groups of controls . 3
5 Test conditions . 3
6 Construction . 3
6.1 General . 3
6.2 Construction requirements . 3
6.2.1 Appearance . 3
6.2.1.1 Design . 3
6.2.2 Holes . 3
6.2.3 Breather holes . 3
6.2.4 Screwed fastenings . 3
6.2.5 Jointing . 3
6.2.6 Moving parts . 3
6.2.7 Sealing caps . 4
6.2.8 Dismantling and reassembling for servicing and/or adjustment . 4
6.2.9 Auxiliary channels . 4
6.2.101 Open position indicator switch . 4
6.2.102 Controls assembled to a valve . 4
6.3 Materials . 4
6.3.1 General material requirements . 4
6.3.2 Housing . 4
6.3.3 Springs . 4
6.3.4 Resistance to corrosion and surface protection . 4
6.3.5 Impregnation . 4
6.3.6 Seals for glands for moving parts . 5
6.3.101 Closure member . 5
6.4 Gas connections . 5
6.4.1 Making connections . 5
6.4.2 Connection sizes . 5
6.4.3 Threads . 5
6.4.4 Union joints . 5
6.4.5 Flanges . 5
6.4.6 Compression fittings . 5
6.4.7 Nipples for pressure tests . 5
6.4.8 Strainers . 5
6.101 Pneumatic and hydraulic actuating mechanisms . 5
COPYRIGHT PROTECTED DOCUMENT
7 Performance . 5
© ISO 2015, Published in Switzerland
7.1 General . 5
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
7.2 Leak-tightness . 6
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
7.2.1 Criteria . 6
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
7.2.2 Test for leak-tightness . 6
the requester.
7.3 Torsion and bending . 6
ISO copyright office
7.4 Rated flow rate . 6
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland 7.5 Durability . 6
Tel. [phone]
7.6 Functional requirements. 6
Fax [phone]
[e-mail]
www.iso.org
© ISO 2015 – All rights reserved iii
ii © ISO 2015 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/DIS 23551-10
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 3
4.1 Classes of controls . 3
4.2 Groups of controls . 3
5 Test conditions . 3
6 Construction . 3
6.1 General . 3
6.2 Construction requirements . 3
6.2.1 Appearance . 3
6.2.1.1 Design . 3
6.2.2 Holes . 3
6.2.3 Breather holes . 3
6.2.4 Screwed fastenings . 3
6.2.5 Jointing . 3
6.2.6 Moving parts . 3
6.2.7 Sealing caps . 4
6.2.8 Dismantling and reassembling for servicing and/or adjustment . 4
6.2.9 Auxiliary channels . 4
6.2.101 Open position indicator switch . 4
6.2.102 Controls assembled to a valve . 4
6.3 Materials . 4
6.3.1 General material requirements . 4
6.3.2 Housing . 4
6.3.3 Springs . 4
6.3.4 Resistance to corrosion and surface protection . 4
6.3.5 Impregnation . 4
6.3.6 Seals for glands for moving parts . 5
6.3.101 Closure member . 5
6.4 Gas connections . 5
6.4.1 Making connections . 5
6.4.2 Connection sizes . 5
6.4.3 Threads . 5
6.4.4 Union joints . 5
6.4.5 Flanges . 5
6.4.6 Compression fittings . 5
6.4.7 Nipples for pressure tests . 5
6.4.8 Strainers . 5
6.101 Pneumatic and hydraulic actuating mechanisms . 5
7 Performance . 5
7.1 General . 5
7.2 Leak-tightness . 6
7.2.1 Criteria . 6
7.2.2 Test for leak-tightness . 6
7.3 Torsion and bending . 6
7.4 Rated flow rate . 6
7.5 Durability . 6
7.6 Functional requirements. 6
© ISO 2015 – All rights reserved iii

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ISO/DIS 23551-10
7.6.1 Requirement .6
7.6.2 Test of opening function .7
7.7 Endurance .7
7.7.1 Requirement .7
7.7.2 Endurance test .7
7.7.3 Endurance test for open position indicator switch .8
7.101 Opening force .8
7.101.1 Requirement .8
7.101.2 Test of opening force .8
7.102 Opening time .8
7.102.1 Requirement .8
7.102.2 Test of opening time .8
7.103 Delay time and closing time .9
7.103.1 Requirement .9
7.103.2 Test of delay time and closing time .9
7.104 Open position indicator switch .9
7.104.1 Requirement .9
7.104.2 Test of open position indicator switch .9
8 EMC/Electrical requirements .9
9 Marking, installation and operating instructions .9
9.1 Marking .9
9.2 Installation and operating instructions . 10
9.3 Warning notice . 10
Annex A (informative) Leak-tightness test — Volumetric method . 11
Annex B (informative) Leak-tightness test — Pressure-loss method . 12
Annex C (normative) Conversion of pressure loss into leakage rate . 13
Annex D (normative) Test for immunity to power-frequency magnetic fields . 14
Annex E (normative) Specific regional requirements in European countries . 15
Annex F (normative) Specific regional requirements in Canada and USA . 16
F.1 General . 16
F.2 Additional requirements and modifications . 16
F.7.2.2 Test for leak-tightness . 16
Annex G (normative) Specific regional requirements in Japan . 17

Tables
Table 1 — Operating cycles . 8

iv © ISO 2015 – All rights reserved

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ISO/DIS 23551-10
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 23551-10 was prepared by Technical Committee 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 4: Valve-proving systems for automatic shut-off valves
 Part 5: Manual gas valves
 Part 6: Thermoelectric flame supervision controls
 Part 7: Pressure sensing devices
 Part 9: Mechanical gas thermostats
 Part 10: Vent valves

© ISO 2015 – All rights reserved v

---------------------- Page: 5 ----------------------
ISO/DIS 23551-10
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 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.
vi © ISO 2015 – All rights reserved

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DRAFT INTERNATIONAL STANDARD ISO/DIS 23551-10


Safety and control devices for gas burners and gas-burning
appliances — Particular requirements — Part 10: Vent Valves
1 Scope
This International Standard specifies the safety, design, construction and performance requirements and
testing for automatic vent valves (hereafter referred to as "valves") for use with gas burners, gas appliances
burning one or more gaseous fuels.
This International Standard is applicable to valves with declared maximum inlet pressures up to and including
500 kPa (5 bar) of nominal connection sizes up to and including DN 100 (4”).
This International Standard is applicable to
 normally open valves;
 electrically operated valves and to valves actuated by fluids where the control valves for these fluids are
actuated electrically, but not to any external devices for switching the control signal or actuating energy;
 valves fitted with open position indicator switches.
This International Standard is not applicable to
 valves for burners and appliances using renewables and/or waste gases (i. e. gases having corrosive
characteristics),and
NOTE 1 In case valves are in contact with renewables and, or waste gases, it is recommend to use this standard only if
explicit information is provided and relevant test methods and requirements are specified.
 valves for appliances intended to be installed in the open air and exposed to the outdoor environment,
and
 valves that are connected directly to mains pipe-work or to a container that maintains a standard
distribution pressure, and
 valves suitable with oil.
This International Standard is applicable to type testing only.
NOTE 2 Provisions for final product inspection and testing by the manufacturer are not specified.
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
© ISO 2015 – All rights reserved
1

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ISO/DIS 23551-10
3 Terms and definitions
For the purpose of this document, the terms and definitions given in ISO 23550:2011 and the following apply.
3.101
automatic vent valve
device which closes when energised and opens automatically when de-energised
3.102
actuating mechanism
part of the valve which moves the closure member
3.103
open position indicator switch
device fitted to a valve which indicates when the closure member is in the open position
3.104
actuating energy
required energy for the actuating mechanism to move the closure member to the closed position
Note 1 to entry: The actuating energy can have an external source (electrical, pneumatic or hydraulic) and can be
transformed inside the valve.
3.105
opening force
force required to open the valve, independent of any force provided by fuel gas pressure
3.106
frictional force
largest force required to move the actuating mechanism and the closure member from the closed position to
the open position with the opener spring removed, independent of any force provided by fuel gas pressure
3.107
actuating pressure
hydraulic or pneumatic pressure supplied to the actuating mechanism of the valve
3.108
opening time
time interval between de-energising the valve and the closure member attaining the open position
3.109
closing time
time interval between energising the valve and the closure member attaining the closed position
3.110
delay time
time interval between energising the valve and the start of the closure member moving to the closed position
3.111
control valve
device which controls the fluid (e.g. compressed air) supplied to the actuating mechanism
3.112
rated voltage
voltage as stated in the installation and operating instructions at which the val
...