ISO 23551-10:2016

Overview

ISO 23551-10:2016 - "Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Part 10: Vent valves" specifies safety, design, construction, performance and test requirements for automatic vent valves used with gas burners and gas-burning appliances. It covers valves with declared maximum inlet pressures up to and including 500 kPa (5 bar) and nominal connection sizes up to and including DN 100 (4"). This part is intended to be used in combination with ISO 23550 to provide the complete product requirements and is applicable to type testing only.

Key topics and technical requirements

ISO 23551-10:2016 addresses the following technical areas and test criteria:

• Scope & applicability

  • Applies to normally open valves, electrically operated valves, and valves actuated by fluids where the fluid control is electrically actuated.
  • Includes valves fitted with open position indicator switches.
  • Exclusions: valves for renewables/waste gases (unless explicit test methods/info provided), outdoor-exposed appliances, valves directly connected to mains pipe-work or standard-pressure containers, and valves suitable with oil.

• Construction and materials

  • Requirements for appearance, holes/breather holes, screwed fastenings, jointing, moving parts, sealing caps, dismantling for service, auxiliary channels, and materials (housing, springs, seals, corrosion resistance).

• Gas connections

  • Specifications for making connections, connection sizes, threads, unions, flanges, strainers and actuating mechanisms.

• Performance and testing

  • Leak-tightness (volumetric and pressure-loss methods).
  • Rated flow rate, torsion and bending, durability, endurance (including indicator switch endurance).
  • Functional tests: opening force, opening time, delay and closing times.
  • EMC/electrical requirements and immunity to power-frequency magnetic fields.

• Marking and documentation

  • Marking, installation and operating instructions, and required warning notices.

• Annexes

  • Includes informative and normative annexes (leak-tightness test methods, conversion of pressure loss into leakage rate, regional requirements for Europe/USA/Canada/Japan, EMC tests).

Practical applications and users

ISO 23551-10 is used to:

• Guide manufacturers in designing and testing automatic vent valves for gas appliances.
• Define test protocols for certification bodies and test laboratories performing type testing.
• Inform product engineers, safety assessors, specifiers, and procurement teams when selecting compliant vent valves for industrial, commercial and residential gas-burning appliances.
• Help installers and maintenance personnel understand marking, installation and serviceability requirements.

Keywords: ISO 23551-10:2016, vent valves, automatic vent valve, gas burners, gas-burning appliances, leak-tightness, endurance testing, EMC, DN 100, 500 kPa.

Related standards

• ISO 23550 (general requirements to be used in combination with this part)
• Regional normative references included in annexes for Europe, USA/Canada and Japan.