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1. A centrifugal pump for pumping a heat-sensitive fluid foodstuff, comprising a volute casing having an upper part, an inlet port in the upper part configured to be connected to an infusion chamber, a lower part and an outlet port for the heat sensitive fluid foodstuff on a perimeter of the volute casing between the upper part and the lower part, the volute casing enclosing an impeller comprising a disc operably associated with an end of a shaft, said disc having a center, a first surface and a second surface opposite the first surface, said first surface facing the inlet port of the casing and being provided with vanes, wherein the second surface of the disc of the impeller is exposed to a cooling medium, wherein the volute casing comprises a cooling cavity having a perimeter, a cooling medium inlet port attached to the lower part of the volute casing adjacent to the outlet port and a cooling medium outlet port in the lower part between the second surface of the rotating disc and the volute casing in fluid communication with the cooling medium inlet port and the cooling medium outlet port, wherein the center of the disc is horizontally centered in the volute casing or wherein the disc has a rotating axis that is horizontally centered in the volute casing, wherein the cooling cavity forms an essentially co-radial annular space between the second surface of the disc and the lower part of the volute casing, wherein a seal is positioned towards the perimeter of the essentially co-radial annular space, and wherein the upper part of the volute casing comprises a cooling jacket extending in substantially an entire circumference of the upper part of the volute casing and wherein the cooling jacket faces the vanes of the impeller.
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