Importance

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Abstract

A proportional volumetric dosing unit (1) is described comprising a pump (25) provided with a piston (235) adapted to supply an auxiliary fluid to a motor (20) of the proportional volumetric dosing unit itself, which moves the piston (235) of the pump and is fluidly connected to an inlet conduit (10) of a main fluid and an outlet conduit (15) of a mixed fluid, said motor comprising a piston (30) slidably housed in a cylinder (100) of the motor and connected to the piston (235) of the pump to move it, wherein the piston (30) comprises an annular scaling lip (80) protruding from a top (55) of the piston (30), and an end portion thereof distal from the top of the piston is applied in contact to the cylinder (100) making a fluid seal, said proportional volumetric dosing unit being characterized in that it comprises an elastic element (130) which pushes the annular sealing lip (80) against the cylinder (100).

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First Claim