Fluid measurement and dosing device

摘要

The fluid measurement/division device (1) comprises a plurality of cylinders (2, 3) in which a first and a second piston (4, 5) are slidably inserted to operate alternately as a dosing piston or as a piloting piston for the dosing piston. The first and said second piston (4, 5) present reduced diameter regions which, together with the surface of the cylinders (2, 3), define at least three constant volume distribution chambers (6a, 7a, 8a, 6b, 7b, 8b) and two variable volume pumping chambers (9a, 10a, 9b, 10b). The device (1) comprises a plurality of conduits connecting said cylinders (2, 3) together and to the outside, to allow or prohibit hydraulic connection in relation to the position assumed by the first and by the second piston (4, 5), such that when the first piston (4) is in the dosing stage and, by translating, it dispenses fluid and passes to the piloting stage, the second piston (5) passes from the piloting stage to the dosing stage via a neutral stage.