ISO 23551-10:2025

This document specifies safety, constructional, performance and testing requirements of normally open automatic vent valves, hereafter referred to as “valves”. This document applies to valves with a declared maximum operating pressure up to and including 500 kPa of nominal connection sizes up to and including DN 100 (4”), for use in gas control train of gas burners or in appliances using gaseous fuels such as natural, manufactured or liquefied petroleum gas (LPG). It is not applicable to corrosive and waste gases. This document applies to: —     electrically operated valves and to valves actuated by fluids where the control valves for these fluids are actuated electrically, but not to any external devices for switching the control signal or actuating energy; —     valves fitted with open position indicator switches. This document covers type testing only.