A dosing unit for concentrate in a post-mix beverage dispenser is described which includes an enclosed cylinder space, and a pump piston with a bore running parallel with the axis. A control piston which is in contact with the input side shutoff of the cylinder space is disposed within and movable longitudinally...http://www.google.se/patents/US5234134?utm_source=gb-gplus-sharePatent US5234134 - Device for the measured dispensing of liquids out of a storage container
