| 摘要 |
The invention concerns a hydraulic system (1) with a pressure source (2, 3) controllable via a load sensing signal, a pressure sink (4), at least two working sections (6, 7), each having a hydraulic consumer (8, 18) and a control valve (9, 9') with a load sensing signal connection (19, 20; 19', 20') and at least one back-pressure valve (17) arranged in a tank pipe between the control valve (9, 9'9 and the pressure sink (4). In such a system the pressure required from the pump in the neutral position must be as low as possible. On the other hand, however, oscillations should not occur, when an external force acts on another hydraulic consumer in the neutral position of a control valve. In the neutral position of the control valves (9, 9') the load sensing signal connection ( 19, 20; 19' 20') is therefore connected with the pressure sink (4) via an auxiliary tank pipe (23, 23', 23"; 29) by-passing the back-pressure valve (17).
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