Abstract: The invention relates to a device for metering an additive into a fluid, containing a valve body, a fluid inlet, and a fluid outlet. A first channel system extends between the fluid inlet and the fluid outlet in the valve body, and a second channel system extends between the fluid inlet and the fluid outlet in the valve body such that in the operating state fluid can flow from the fluid inlet to the fluid outlet either through the first channel system or through the second channel system. The valve body contains a docking element which is configured for docking a cartridge for the additive. A switchover device is provided which can be switched if the cartridge is docked such that the second channel system is fluidically connected to the cartridge when the cartridge is connected to the docking element.

Abstract: A system and method for producing an extract from an extraction material by means of an extraction agent comprises a supply line for the extraction agent, a heating device, a brewing device for the extraction material and an extract collection container. The supply line contains a measuring element and at least one volumetric flow control element for the volumetric flow of the extraction agent. In addition, the temperature of the heated extraction agent can be measured by means of the measuring element. The system comprises a control unit, the control unit containing a dosage regime for the heated extraction agent for the brewing device. The dosage regimen can be selected by means of an input device, whereby the volumetric flow control element can be set according to the dosage regimen and is monitored via the measuring element.