Abstract: The beverage preparation unit comprises a mixing chamber having a beverage outlet, a liquid flow path for supplying a liquid to the mixing chamber, and an air flow path for supplying air to the liquid flow path. The mixing chamber is arranged for receiving a beverage related ingredient, such as concentrate, preferably from an exchangeable supply pack. The liquid flow path is arranged for generating a hollow jet of liquid having an outer liquid portion extending in a flow direction of the jet and an inner air portion extending in a flow direction of the jet wherein the outer liquid portion surrounds the inner air portion.

Abstract: A dosing pump for dosing metered amounts of liquid product, includes an inlet adapted to be fluidly connected to a storage container, an output adapted to be connected to a beverage dispensing machine for receiving metered amounts of liquid product, and a dosing chamber arranged for transferring a liquid from the inlet to the output. The dosing chamber is at least partly filled with a liquid different from the liquid product. The different liquid can be a cleaning fluid, or be food compliant. The dosing pump can be included in an exchangeable supply pack filled with the liquid product for connecting to a beverage dispensing machine, and the output can be adapted to be brought into fluid connection with a beverage dispensing machine. When associated with a beverage dispensing machine, the dosing pump can be operated to allow the different fluid to be pumped through the beverage dispensing machine prior to a first dosing cycle of liquid product.