| 20110135514 | Pump Device - A pump device includes a pulsator as a drive element for a main pump head which is situated in a delivery line and the working chamber of which is provided with a suction-side non-return valve and a pressure-side non-return valve. The working chamber of the pulsator is connected via an oscillation line, which is filled with delivery medium, to the working chamber of the main pump head in such a way that the pulsator sucks delivery medium out of the delivery line and into the working chamber of the main pump head, or presses delivery medium out of the working chamber, in an oscillating fashion. A ventilation valve is provided for ventilating the working chamber of the pulsator, and the ventilation line is a time-controlled valve and/or a pressure-controlled double-seat valve. A device may be provided for introducing a liquid into the working chamber of the pulsator and/or the oscillation line. | 06-09-2011 |
