The present invention relates to an apparatus for evacuating a collection container, comprising a pump, the pump being suitable for being in connection with the collection container with its inlet, a pressure tank and a directional control valve, the pump transporting a medium out of the collection container and the pressure tank into the atmosphere when the pressure tank is connected to its inlet, wherein the directional control valve is configured to switch the pressure tank from the inlet to the outlet of the pump when a predefined criterion is fulfilled. The present invention further relates to a breast pump device comprising an apparatus for evacuating a collection container and a receiving funnel for receiving a beast of a woman.
