ISO 23551-5:2023

This document specifies safety, constructional and performance requirements for manual gas valves intended for use with gas burners and gas-burning appliances, hereafter referred to as "valves", unless otherwise specified.
This document applies to the following types of manual gas valves:
—     manual gas shut-off valves;
—     gas burner valves;
—     appliance connector valves;
—     delta C valves.
This document applies to valves for gas burners and gas-burning appliances of nominal connection size up to and including DN 100 that can be used and tested independently of these appliances using fuel gases, as natural gas, manufactured gas or liquefied petroleum gas (LPG) at inlet pressures up to and including 500 kPa.
This document is not applicable to corrosive and waste gases.
This document covers type testing only.