Patent ID: 7887308

Claim:
A volumetric pump comprising at least one first piston inside a first hollow cylindrical part, said pump having at least one inlet port through which a liquid can be sucked into at least one pump chamber during an instroke of said first piston, and at least one outlet port through which the liquid can be expelled during an outstroke of the first piston, the pump further comprising at least one second piston which is positioned opposite to the first piston inside a second hollow cylindrical part to create a second pump chamber through which the liquid can be sucked in through an inlet port during an instroke of the second piston and expelled through an outlet port during an outstroke of said second piston, both cylindrical parts of the pump being assembled end-to-end facing each other to form a housing, wherein a disc, that comprises the inlet and outlet ports, is mounted midway inside said housing, and is arranged to be animated by a combined bidirectional linear and angular movement, to cause relative to-and-fro sliding between the housing and the pistons along the axis of said pistons to produce said instrokes and outstrokes of the first and second pistons, whereas rotation of the disc relative to the housing is arranged to close the inlet and outlet ports synchronically to ensure a continuous flow delivery.