| 摘要 |
A control device for a working device ( 12 ) connected to a hydraulic circuit ( 10 ), especially for a load fork ( 16 ) which can be raised and lowered with a working cylinder ( 14 ) in a fork-lift truck. A valve control unit moves into an adjustment position when the load fork ( 16 ) is lowered even when carrying a load ( 18 ). A predefinable maximum volume flow is maintained in the hydraulic circuit ( 10 ). By providing the valve control unit with a pressure regulator ( 26 ) limiting a pilot control pressure for the control valve ( 28 ), once a predefinable regulating pressure differential is reached in the hydraulic circuit, the control valve moves into a regulating position to maintain the maximum volume flow. The known flow control valve is replaced in the main flow by a pressure regulator ( 26 ) disposed in the pilot control circuit ( 40 ), and only needs to be dimensioned for low volume flows. As a result, the control system can be constructed using simple, low-cost components which operate in a functionally reliable manner and enable stable control behavior.
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