The present invention relates to a capsule system for preparing beverages by centrifugation of a capsule (1) in a centrifuging brewing device comprising: —a centrifuging brewing device comprising control means (25) capable of operating the device in centrifugation by controlling the beverage flow rate and/or the volume of the beverage, and —a capsule to be inserted in the brewing device wherein the capsule is designed to form, alone or in cooperation with the centrifuging brewing device, a flow restriction or flow restriction valve which provides a backpressure for the centrifuged liquid, wherein the control means (25) of the device selectively adjusts the rotational centrifugation speeds of the inserted capsule (1) and/or the volume of injected liquid in the capsule as a function of the exerted backpressure by the restriction or restriction valve.