ISO 23551-4:2018
(Main)Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 4: Valve-proving systems for automatic shut-off valves
Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 4: Valve-proving systems for automatic shut-off valves
ISO 23551-4:2018 specifies safety, constructional and performance requirements of valve-proving systems (VPS), intended for use with gas burners and gas-burning appliances. It also describes the test procedures for checking compliance with these requirements and provides information necessary for the purchaser and user. ISO 23551-4:2018 is applicable to all types of VPS which are used for the automatic detection of leakage in a gas burner section having at least two valves designed in accordance with ISO 23551‑1 and which give a signal if the leakage of one of the valves exceeds the detection limit. ISO 23551-4:2018 is applicable to VPS with a maximum working pressure up to and including 500 kPa for use in systems using fuel gases. ISO 23551-4:2018 is not applicable to VPSs for use in explosive atmospheres. NOTE Provisions for production control are not part of the ISO 23551 series.
Dispositifs de contrôle et de sécurité pour les brûleurs à gaz et pour les appareils utilisant le gaz — Exigences particulières — Partie 4: Systèmes de contrôle d'étanchéité pour robinets automatiques de sectionnement
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 23551-4
Second edition
2018-04
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 4:
Valve-proving systems for automatic
shut-off valves
Dispositifs de contrôle et de sécurité pour les brûleurs à gaz et pour
les appareils utilisant le gaz — Exigences particulières —
Partie 4: Systèmes de contrôle d'étanchéité pour robinets
automatiques de sectionnement
Reference number
ISO 23551-4:2018(E)
©
ISO 2018
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ISO 23551-4:2018(E)
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© ISO 2018
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ii © ISO 2018 – All rights reserved
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ISO 23551-4:2018(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 3
4.1 Classes of control . 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
6.3 Materials . 4
6.4 Gas connections . 4
6.5 Gas controls employing electrical components in the gas way . 4
6.6 Electronic parts of the control .
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