Process and an apparatus for preparing a beverage under controlled pressure conditions

摘要

A process of preparing a beverage from a beverage preparation chamber includes feeding water to the preparation chamber until a first pressure is reached, interrupting the flow of water to the preparation chamber, holding the preparation chamber in a closed condition for a first time interval, opening the outlet of the preparation chamber and delivering the thus prepared beverage.

主权项

1. A process of preparing a beverage, comprising:
feeding water to a closed beverage preparation chamber until a first pressure (P1) is reached, the closed beverage preparation chamber being a brewing chamber provided with a valve means; interrupting at least once the flow of water to said preparation chamber (tpump); maintaining said preparation chamber in a closed condition at said first pressure (P1) for a pressure-holding time (tpump−t1); resuming at least once said flow of water to the said preparation chamber at the end of said pressure holding time (tpump−t1); and opening said valve means of the preparation chamber to dispense the thus prepared beverage from an outlet of said preparation chamber, said opening step being carried out by a control unit via a piezoelectric valve.