A device (1) for regulating the flow of a liquid, comprising a first (2) and a second body (3), the first body (2) providing a first passage (4) in fluid communication with a regulation channel (5), the second body providing a second passage (6) that can be placed at a desired point of the regulation channel (5) and in fluid passage communication with the first passage (4) through the regulation channel (5) the regulation channel (5) has a plurality of first sections (5A) and second sections (5B) which follow one another in an alternating manner in a direction of flow of the fluid, the first sections (5A) having a passage section smaller with respect to that of the second sections (5B).
