Exchangeable supply pack for a beverage dispensing machine, doser, pump assembly and method of manufacturing

This invention describes an exchangeable supply pack(2) for a beverage dispensing machine. The pack comprises a doser (1) including a pump assembly comprising a pump channel (5) between an inlet (28) and an outlet (30), for receiving a fluid from an ingredient container and for pumping it to the outlet. The pump assembly comprises a pump chamber (11) and at least two engaging gears (13, 18) forming a gear pump (16). At least one of said gears forms a driving gear (13) and comprises a shaft opening (57) for receiving a driving axle of the beverage dispensing machine. The shaft opening (57) coincides with an axle reception opening (59) of a support wall of the pump chamber, and a flexible seal (10) is arranged at least between the driving gear and the support wall. The seal comprises a through opening (55) coinciding with the shaft opening (57) and the axle reception opening (59) for receiving the driving axle. The invention further describes a pump assembly, a doser, and a method of manufacturing such a pack.