The invention relates to a pump comprising a wall ( 3； 21, 22； 31, 32, 33 ), which forms an enclosed fluid volumetric space ( 1 ) and which can be moved by a first force (F) in a direction resulting in a decrease in volume and, after a preceding decrease in volumetric space, can be moved by a second force in a direction resulting in an increase in volume. The pump also comprises an inlet valve ( 8 ), which communicates with an inlet valve ( 6 ), and comprises an outlet valve ( 9 ) in an outlet line ( 7 ) of the fluid volumetric space ( 1 ). The inventive pump has a compact design due to the fact that it is provided in the form of a vacuum pump whose volumetric space can be decreased by the external first force acting against an elastically deformable material ( 2； 21, 22； 33 ) whose restoring force, after the external force ceases, generates the second force acting counter to the generated vacuum.
