Patent ID: 7299947

Claim:
A metering device for flowable products, the metering device comprising: a metering cylinder; a valve cylinder coaxially arranged in the metering cylinder, wherein the valve cylinder has an upper end and is configured to be connected with the upper end to a product reservoir; an annular chamber defined between the metering cylinder and the valve cylinder; a ring-shaped metering piston arranged in the annular chamber to be moveable between an upper intake position and a lower dispensing position; wherein the metering piston divides the annular chamber into an upper part and a lower part, wherein the upper part is configured to be connected to the product reservoir and the lower part forms a metering chamber; a mouthpiece closing a bottom side of the metering chamber and having a coaxial cylindrical dispensing opening; a central valve piston movable into operating positions releasing or closing the annular chamber; wherein the valve cylinder and the valve piston form a rotatable control unit, wherein the rotatable control unit has a first rotary position for connecting the metering chamber to a supply channel in the valve cylinder and a second rotary position for connecting the metering chamber to at least one outlet channel provided in the valve piston.