The present invention relates to a device for circulating a liquid substance mixture, for example a solution, emulsion or suspension, between a container and a pressure sensitive component supplied from such a container, for example, ink between the print head of a print system and an ink storage container. An apparatus for circulating a gas, comprising: a pump for circulating a liquid substance mixture in a container through an external line circuit; a venturi tube having a main line connected to the external line circuit; and an outlet connection of the pressure reducing component; It includes a line connecting to the suction connection of the venturi tube.
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