ISO 23551-1:2024
(Main)Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic and semi-automatic shut-off valves
Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic and semi-automatic shut-off valves
This document specifies safety, constructional and performance requirements and testing of automatic, semi-automatic shut-off valves and general purpose valves for gas burners, gas appliances and appliances of similar use, hereinafter referred to as valves. This document applies to normally closed valves and general purpose valves mounted upstream to gas burners and gas appliances with declared maximum operating pressures up to and including 500 kPa, for use on burners or in appliances using fuel gases such as natural gas, manufactured gas or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. This document applies to: — 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. This document 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
Relations
Standards Content (Sample)
International
Standard
ISO 23551-1
Third edition
Safety and control devices for
2024-11
gas burners and gas-burning
appliances — Particular
requirements —
Part 1:
Automatic and semi-automatic shut-
off 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 2024
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Published in Switzerland
ii
Contents Page
Foreword .vi
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Terms related to valves .2
3.2 General terms .3
4 Classification . 5
4.1 Classes of control .5
4.1.1 Classification based on sealing force .5
4.1.2 Classification based on pressure surge.5
4.1.3 Classification with neither sealing force nor pressure surge .5
4.1.4 Classification of flow control valves for general purpose .5
4.2 Groups of controls .6
4.3 Types of DC supplied controls .6
4.4 Classes of control functions .6
5 Test conditions and tolerances . 6
6 Construction . 6
6.1 General .6
6.2 Construction requirements.8
6.2.1 Appearance .8
6.2.2 Holes .8
6.2.3 Breather holes .8
6.2.4 Vent limiter .8
6.2.5 Screwed fastenings .8
6.2.6 Moving parts .8
6.2.7 Sealing caps .8
6.2.8 Disassembling and assembling for servicing and/or adjustment for controls .8
6.2.9 Auxiliary channels and orifices .10
6.2.10 Pre-setting device .10
6.2.11 Closed position indication .10
6.2.12 Specific construction .11
6.2.13 Flow rates of valves with modulating control .11
6.2.14 Bypass . 12
6.2.15 Semi-automatic shut-off valve . 12
6.2.16 Diaphragm type valve . 12
6.2.17 Balanced valves with one or two ports . 12
6.3 Materials .14
6.3.1 General material requirements .14
6.3.2 Housing .14
6.3.3 Springs providing closing force and sealing force .14
6.3.4 Resistance to corrosion and surface protection .14
6.3.5 Impregnation .14
6.3.6 Seals for glands for moving parts. 15
6.3.7 Jointing . 15
6.3.8 Closure members . 15
6.4 Connections . 15
6.4.1 General . 15
6.4.2 Connection sizes . 15
6.4.3 Connections types . 15
6.4.4 Threads . 15
6.4.5 Union joints . 15
6.4.6 Flanges . 15
iii
6.4.7 Compression fittings . 15
6.4.8 Flare connections .16
6.4.9 Nipples for pressure tests .16
6.4.10 Strainers . . .16
6.4.11 Gas connections by GQC .16
6.4.12 Hydraulic and pneumatic actuating mechanisms .16
6.5 Gas controls employing electrical components in the gas way .16
7 Performance .16
7.1 General .16
7.2 Leak-tightness .18
7.2.1 General .18
7.2.2 Requirements .18
7.2.3 Test . . .18
7.2.4 Pressure surge test .18
7.3 Torsion and bending .18
7.4 Rated flow rate .
...
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