Patent ID: 8240510

Claim:
A multi-way valve device having a hollow body and an axially movable piston mounted inside the hollow body, the hollow body comprising at least one orifice for the inlet of a liquid solvent and at least two outlet orifices for the solvent, the movable piston is coupled with an axial movement measuring stem of a linear measuring element of a solid substance comprising particles selected from the group consisting of grains, granules, and powder, the measuring stem being actuated by a mechanical actuator and associated with a return spring, and in that the movable piston is designed to move in one direction, freely, or against the pressure of the return spring, under an effect of a pressure of the liquid solvent applied at the inlet orifice to the movable piston, and in an opposite direction, under an effect of a pressure applied to the measuring stem by the return spring, wherein the movable piston comprises a piston head and a piston stem, the piston head comprises at least one internal channel so constructed and arranged to bring into communication at least one inlet orifice and at least one of the outlet orifices for a determined position of the movable piston.