scope:

NEN-ISO 23551-5 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. It also describes the test procedures for checking compliance with these requirements and provides information necessary for the purchaser and user. This International Standard applies to following types of manual gas valves: - gas burner valve; - appliance connector valve; - "delta C" valve; - manual gas shut-off valve. This part of ISO 23551 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. These valves are suitable for fuel gases, such as natural gas, manufactured gas or liquefied petroleum gas (LPG) at inlet pressures up to and including 500 kPa. This ISO Standard covers type testing only.