A fluid-moving device with an integrated valve is disclosed. The device includes a housing defining a suction chamber and at least one internal passageway formed inside the housing. A first end of the internal passageway opens to the suction chamber and a second end of the internal passageway connects...http://www.google.de/patents/US6520755?utm_source=gb-gplus-sharePatent US6520755 - Fluid-moving device with integrated valve
