A delivering device of a liquid substance for preparing beverages is described, comprising at least one nozzle adapted to be placed, in a sequence, next to at least one container of a battery of containers to allow outwards pouring a dose of the liquid substance, in a pre-established amount, such delivering device of a liquid substance for preparing beverages comprising at least one extracting device of vapors of the liquid substance released in a space between the battery of containers and the nozzle.