| 摘要 |
First spring means 14 act on the lift valve 1 in the valve-closing direction, and second spring means 16 act, at least intermittently, in the valve-opening direction. The lift valve 1, or a valve tappet 4 which actuates the valve, is connected to a control piston 8 which is arranged in a working space 11 and is capable of being loaded with a working fluid on both sides. In the region of its end positions, the piston 8 delimits a pressure space 28, 29 belonging to the working space but capable of being separated hydraulically from it. The pressure of the working fluid is capable of being regulated via a pressure source together with a switching valve 27 and a supply line 45, and the prestressing force of the second spring means 16 is capable of being regulated during the operation of the valve control device. The pressure of the working fluid in the pressure space 28 can be regulated even when the pressure space is separated hydraulically from the working space 11 and the pressure space 28 can be loaded with pressure in order to trigger the valve movement.
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