ISO 23551-1:2012

Overview

ISO 23551-1:2012 - "Safety and control devices for gas burners and gas‑burning appliances - Part 1: Automatic and semi‑automatic valves" - specifies safety, constructional and performance requirements and type testing for automatic and semi‑automatic shut‑off valves used with gas burners and gas‑burning appliances. It applies to normally closed valves mounted upstream of burners, with declared maximum working pressures up to and including 500 kPa, for fuel gases such as natural gas, manufactured gas and LPG. The scope covers valves actuated electrically, mechanically, hydraulically or pneumatically, valves with step or modulating control, and valves fitted with closed‑position indicator switches.

Key topics and requirements

ISO 23551‑1 sets out technical requirements and tests, including:

• Classification of valves by control type (automatic, semi‑automatic, step, modulating) and functional groups.
• Constructional requirements: materials, gas connections and design features (including balanced valve designs).
• Performance tests: leak‑tightness (volumetric and pressure‑loss methods), rated flow rate, torsion and bending resistance.
• Durability and endurance: life‑cycle operating tests and sealing/closing force verification.
• Functional requirements: correct operation under specified test conditions, valve‑proving considerations and closed position indication.
• EMC and electrical requirements: immunity and emission tests drawn from IEC/IEC 61000 series and IEC 60730 family (surge, ESD, radiated immunity, voltage variations).
• Marking and documentation: required markings, installation and operating instructions, and warning notices.
• Regional annexes: additional normative requirements for Europe, North America (Canada/USA) and Japan.

Note: this part covers type testing only and is intended to be used in combination with ISO 23550 (general requirements).

Applications and users

ISO 23551‑1 is practical for:

• Valve and appliance manufacturers designing automatic or semi‑automatic gas shut‑off valves.
• Product designers and OEMs developing gas burners, cookers and HVAC equipment that incorporate safety valves.
• Test laboratories and type‑test engineers performing compliance and EMC testing.
• Certification bodies and regulators assessing conformity to international safety standards.
• Safety and reliability engineers verifying performance criteria such as leak tightness, endurance and electrical immunity.

Using ISO 23551‑1 helps ensure gas safety, interoperability, and market acceptance for valves intended for domestic, commercial and industrial gas appliances.

Related standards

• ISO 23550 (General requirements for safety and control devices)
• IEC 60730‑1 / IEC 60730‑2‑17 (automatic electrical controls)
• IEC 61000 series (EMC testing)
• IEC 60079‑11 (intrinsic safety)
• Various ISO pipe‑thread and material standards referenced for connections and components

Keywords: ISO 23551‑1, automatic and semi‑automatic valves, gas burners, gas‑burning appliances, safety requirements, type testing, leak‑tightness, EMC, durability, 500 kPa, LPG, natural gas.