Device for expanding a fluid

A device for expanding a fluid,

• wherein the device (1) is provided with an expander element (2) configured to expand the fluid, a generator (3) and a transmission (4) between the generator (3) and the expander element (2), wherein the generator (3) is a liquid-cooled generator and the expander element (2) is heated using a liquid with lubricating properties, the device (1) further being provided with a common liquid circuit (8) that provides the liquid to one of the generator (3) and the expander element (2) and then to another of the generator (3) and the expander element (2), wherein the generator (3), the transmission (4), and the expander element (2) are arranged in series along the common liquid circuit (8), wherein the liquid circuit (8) includes a liquid pump (10) which can pump up the liquid from a liquid reservoir (11), wherein the liquid circuit (8) also comprises a liquid line (9) which runs from the liquid reservoir (11) and which incorporates the liquid pump (10), the generator (3), the transmission, and the expander element (2).