NBN EN ISO 23553-1:2014

ISO 23553-1:2014 specifies safety, constructional and performance requirements and testing of automatic and semi-automatic valves for oil.
It applies to automatic and semi-automatic valves which are:
-normally closed;
-used in combustion plants to interrupt the oil flow with or without delay on closing;
-for use with oil types (e.g. middle distillate fuel oil, crude oil, heavy fuel oil or kerosene) without gasoline;
-for use on burners or in appliances using oil;
-directly or indirectly operated, electrically or by mechanical or hydraulic means;
-fitted with or without closed-position indicator switches.
ISO 23553-1:2014 covers type testing only.