Assembly for the dosed injection of liquid additives, into water, has a piston plunger moving in alternating directions through a sleeve divided into sealed compartments for the different additives, with their own suction/injection openings

摘要

The assembly to inject a number of different dosed additives into water, and the like, has a piston plunger (9) operated by a hydraulic motor in alternating directions. The piston moves within a sleeve (10) on a vertical axis, with a suction opening (14,17) at the bottom and an injection opening at the top (24,28). The assembly to inject a number of different dosed additives into water, and the like, has a piston plunger (9) operated by a hydraulic motor in alternating directions. The piston moves within a sleeve (10) on a vertical axis, with a suction opening (14,17) at the bottom and an injection opening at the top (24,28). The sleeve is divided into at least two compartments, along its length, to give an upper (C1) and a lower (C2) compartment on the same geometric axis, but sealed (12) against each other. The piston alters the volume capacity of each compartment through its movement through them. Each compartment has its own suction and injection openings for the different liquids (A,B) to be injected in dosed volumes.