Patent ID: 8555934

Claim:
A method for filling and evacuating of a dispenser unit for the delivery of a paste-like, foam-form, or liquid medium, the method comprising the steps of: providing a filling insert including: a storage container configured to store the medium; a suction pump connectable to the storage container and defining a suction pump conveying path; at least one air duct fluidly connecting the interior of the storage container with the ambient environment during filling and closable after evacuation, the at least one air duct being arranged outside the conveying path of the suction pump, said air duct being embodied such that at a first pressure level, air is evacuated from the storage container, and at a second pressure level, the medium penetrates into the air duct, the first pressure level and the second pressure level being distinguishable from each other via the flow counterpressure, and on or shortly after reaching the second pressure level, the evacuation air is terminated and the air duct is closed; and a one-way valve arranged in the air duct, which only operates upon reaching of the second pressure level; filling the storage container with the medium; fastening the suction pump to a pump mounting of the storage container; producing a pressure difference between the ambient environment and the interior of the storage container, via which air situated in the storage container is evacuated through the air duct; and closing the air duct via the one way valve on or shortly after the second pressure level is reached.