Abstract: The invention relates to a breast-milk pump containing a breast cup, a suction connection that can be connected to the suction pump and a blocking device which seals the suction connection against the entry of milk. The pump is provided with a valve housing, containing an inlet that leads to the breast cup, an opening connected to the suction pump and a valve body. The valve body contains a cladding surface and a closing surface, which together form a hollow body, whose opening faces towards the inlet. The hollow body is mounted on a support so that one side can freely pivot. If during a suction phase, the level of milk that has risen above the collection container reaches the inlet, a stream of milk enters the hollow body.