ISO 23551-10:2016

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 2016
© 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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

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
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

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.
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

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
...