A fluid propellant (1) that swiftly delivers fluid doses at varying speeds, volumes and frequencies in a minimum space, comprising a piston (14), preferably with a hollow base, placed in a cylinder (19) located in a support (2, 3), holding an actuator (6) that drives a rotor (10) coupled to a free wheel (8) secured to the rotational shaft (7) of the actuator (6), placed in an oblong (21) of a carriage (13) supporting the piston (14) in such a way as to compress a spring (20), positioned in the hollow of the piston (14) bearing against the support (2, 3), when the liquid is sucked into the cylinder (19), via an inlet opening (4) located on the support (2, 3), and to expel the liquid from the cylinder (19), via an outlet opening (5) located on the support (2, 3), by releasing the spring (20) decoupled from the loading system by means of the free wheel (8).Propulseur de fluide (1) délivrant de manière rapide des doses de fluide a vitesse, volume et fréquence variables dans un encombrement minimal comprenant un piston (14), préférablement creux a sa base, place dans, un cylindre (19) situe dans un support (2, 3), maintenant un actuateur (6) entraînant un rotor (10) couple a une roue libre (8) fixée sur Iaxe (7) de rotation de Iactuateur (6), place dans un oblong (21) dun chariot (13) supportant le piston (14) de manière a comprimer un ressort (20), place dans le creux du piston (14) en appui sur le support (2, 3), lors de Iaspiration du liquide dans le cylindre (19), via un port dentrée (4) situe sur le support (2, 3), et a expulser le, liquide du cylindre (19), via un port de sortie (5) situe sur le support (2, 3), par la détente du ressort (20) découple du système de charge par lintermédiaire de la roue libre (8).
