| 摘要 |
A leveling system for vehicles has at least one pressure-fluid-actuated work cylinder disposed between the vehicle body and the wheel suspension, a pressure fluid source and a pressure fluid sink for supplying pressure fluid to the actuator, and a proportional pressure regulating valve for controlling the flow of pressure fluid. The proportional pressure regulating valve has a main valve and a pilot control valve for controlling the main valve control slide into at least three slide positions; in the middle slide position the three controlled valve connections of the main valve are blocked off. To avoid abrupt changes in position of the vehicle body when the leveling system is put into operation, on the one hand a pressure holding valve that can be pushed open is disposed in the pressure fluid line from the work cylinder to the main valve, and on the other, a pressure-fluid-actuated centering device is provided in the main valve; no later than upon a pressure buildup by the pressure fluid source, this centering device fixes the control slide in its middle slide position, and it releases it again immediately after the opening of the pressure holding valve.
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