ISO 23551-11:2024
(Main)Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 11: Automatic and semi-automatic shut-off valves for operating pressure of above 500 kPa up to and including 6 300 kPa
Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 11: Automatic and semi-automatic shut-off valves for operating pressure of above 500 kPa up to and including 6 300 kPa
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 excluding use in fuel gas infrastructures (transportation and distribution systems). This document applies to controls for use at maximum operating pressures above 500 kPa up to and including 6 300 kPa with sizes up to DN 250 for use on burners or in appliances using fuel gases, such as natural gas, manufactured gas or liquefied petroleum gas (LPG). This document applies to: — valves being mounted in gas installations; — valves directly or indirectly actuated, electrically or by mechanical means; — valves actuated by hydraulic or pneumatic means, including the pilot valves for these fluids if actuated electrically and including release valves, but not to any external electrical devices for switching the actuating energy; — 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; — valves to be used in appliances, but not in gas transfer systems outside appliances. This document covers type testing only. This document does not apply to valves covered under the scope of ISO 23551-1 or the ISO 23555 series.
Dispositifs de commande et de sécurité pour brûleurs à gaz et appareils à gaz — Exigences particulières — Partie 11: Robinets automatiques et semi-automatiques de sectionnement pour une pression de fonctionnement supérieure à 500 kPa et jusqu'à 6 300 kPa inclus
General Information
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Standards Content (Sample)
International
Standard
ISO 23551-11
First edition
Safety and control devices for
2024-11
gas burners and gas-burning
appliances — Particular
requirements —
Part 11:
Automatic and semi-automatic
shut-off valves for operating
pressure of above 500 kPa up to and
including 6 300 kPa
Dispositifs de commande et de sécurité pour brûleurs à gaz et
appareils à gaz — Exigences particulières —
Partie 11: Robinets automatiques et semi-automatiques de
sectionnement pour une pression de fonctionnement supérieure à
500 kPa et jusqu'à 6 300 kPa inclus
Reference number
© ISO 2024
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Published in Switzerland
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Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 3
4.1 Classes of controls .3
4.1.1 Classification based on sealing force .3
4.1.2 Classifications based on pressure surge .3
4.1.3 Classification with neither sealing force nor pressure surge .3
4.1.4 Classification of flow control valves for general purpose .3
4.2 Groups of controls .3
4.3 Types of DC supplied controls .3
4.4 Classes of control function .3
5 Test conditions and tolerances . 4
5.1 Test conditions .4
5.2 Tolerances .4
6 Construction . 4
6.1 General .4
6.2 Construction requirements.6
6.2.1 Appearance .6
6.2.2 Holes .6
6.2.3 Breather holes .6
6.2.4 Vent limiter .6
6.2.5 Screwed fastenings .6
6.2.6 Moving parts .7
6.2.7 Sealing caps .7
6.2.8 Disassembling and assembling for servicing and/or adjustment for controls .7
6.2.9 Auxiliary channels and orifices .8
6.2.10 Pre-setting device .8
6.2.11 Closed position indication .8
6.2.12 Specific construction .10
6.2.13 Flow rates of valves with modulating control .10
6.2.14 Bypass .10
6.2.15 Semi-automatic shut-off valve .10
6.2.16 Other controls assembled to a valve .11
6.2.17 Balanced valves .11
6.3 Materials .11
6.3.1 General material requirements .11
6.3.2 Housing . 12
6.3.3 Springs providing closing force and sealing force . 13
6.3.4 Resistance to corrosion and surface protection .14
6.3.5 Impregnation .14
6.3.6 Seals for glands for moving parts.14
6.3.7 Jointing .14
6.3.8 Closure members .14
6.3.9 Parts transmitting the closing force .14
6.3.10 Balanced valves .14
6.3.11 Bellows . 15
6.3.12 Hydrostatic withstand pressure test . 15
6.4 Connections .16
6.4.1 General .16
6.4.2 Connection sizes .16
iii
6.4.3 Connections types .16
6.4.4 Threads .16
6.4.5 Union joints .16
6.4.6 Flanges .17
6.4.7 Compression fittings .17
6.4.8 Flare connections .17
6.4.9 Nipples for pressure tests .17
6.4.10 Strainers . . .18
6.4.11 Gas connections by GQC .18
6.4.12 Welded connections . .18
6.5 Gas controls employing electrical components in the gas way .18
6.6 Pneumatic and hydraulic actuating mechanisms .18
7 Performance . 19
7.1 General .19
7.2 Leak-tightness .
...
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