The invention concerns a steam circuit process device comprising a reservoir for a liquid working medium; a feed pump for supplying working medium from the reservoir to an evaporator, in which the working medium is evaporated; an expander, to which vaporised working medium is fed by the evaporator, which expands by way of performing mechanical work in the expander; a condenser, which follows the expander and is in fluid connection with the reservoir, whereas the working medium is liquefied in the condenser; The invention is characterised in that the steam circuit process device includes an emptying pump for the working medium which is arranged in a by-pass line between the reservoir and a switchable valve system in fluid communication with at least one further component of the steam circuit process device.