Abstract: A flowrate control device for a fluid, includes a cartridge body defining a path for the fluid and having an upstream portion for the entry of the fluid, and a downstream portion provided with an outlet opening for the fluid. A shutter element is arranged in the cartridge body for sliding movement between an upstream end of the cartridge body corresponding to a minimum throttling position for the fluid and a downstream end of the cartridge body corresponding to a maximum throttling position for the fluid. The shutter element is provided with a throttling wall arranged downstream for throttling the outlet opening in a controlled manner and an upstream wall cooperating with the upstream portion of the cartridge body for bounding an inlet section for the fluid. A counter spring element exerts a contrasting force on the shutter element suitable for displacing the shutter element towards the upstream end.