ISO 23551-10:2025

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

This document specifies safety, constructional, performance and testing requirements of normally open automatic vent valves, hereafter referred to as “valves”. This document applies to valves with a declared maximum operating pressure up to and including 500 kPa of nominal connection sizes up to and including DN 100 (4”), for use in gas control train of gas burners or in appliances using gaseous fuels such as natural, manufactured or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. This document applies to: — 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 document covers 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: 07-May-2025
• 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 - Controls and protective devices for gas and/or oil
• Current Stage: 6060 - International Standard published
• Start Date: 08-May-2025
• Due Date: 22-Aug-2025
• Completion Date: 08-May-2025

Relations

• Revises: ISO 23551-10:2016 - Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 10: Vent valves
• Effective Date: 27-Aug-2022

Standards Content (Sample)

International
Standard
ISO 23551-10
Second edition
Safety and control devices for
2025-05
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 2025
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. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 3
4.1 Classes of controls .3
4.2 Groups of controls .3
4.3 Types of DC supplied controls .3
4.4 Classes of control functions .3
5 Test conditions and tolerances . 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 Vent limiter .3
6.2.5 Screwed fastenings .3
6.2.6 Moving parts .3
6.2.7 Sealing caps .4
6.2.8 Disassembling and assembling for servicing and/or adjustment for controls .4
6.2.9 Auxiliary channels and orifices .5
6.2.10 Pre-setting device .5
6.2.11 Open position indicator switch (OPS) .5
6.2.12 Controls assembled to a valve .6
6.3 Materials .6
6.3.1 Housing .6
6.3.2 General material requirements .6
6.3.3 Springs providing closing force and sealing force .6
6.3.4 Resistance to corrosion and surface protection .6
6.3.5 Impregnation .6
6.3.6 Seals for glands for moving parts.6
6.3.7 Jointing .6
6.3.8 Closure members .6
6.3.9 Springs providing opening force .7
6.4 Connections .7
6.4.1 General .7
6.4.2 Connection sizes .7
6.4.3 Connection types .7
6.4.4 Threads .7
6.4.5 Union joints .7
6.4.6 Flanges .7
6.4.7 Compression fittings .7
6.4.8 Flare connections .8
6.4.9 Nipples for pressure tests .8
6.4.10 Strainers . . .8
6.4.11 Pneumatic and hydraulic actuating mechanisms .8
6.5 Gas controls employing with electrical components in the gas way .8
7 Performance . 8
7.1 General .8
7.2 Leak-tightness .8

iii
7.2.1 General .8
7.2.2 Requirements .8
7.2.3 Test . . .9
7.3 Torsion and bending .9
7.4 Rated flow rate .9
7.5 Durability .9
7.6 Functional requirements . .9
7.6.1 Opening function . .9
7.6.2 Opening force .10
7.6.3 Delay time and closing time .10
7.6.4 Opening time .11
7.7 Endurance .11
7.7.1 Requirements .11
7.7.2 Test . . . 12
7.8 Open position indicator switch . 12
7.8.1 Requirement .
...