| 摘要 |
A control arrangement for a hydraulic power transmission comprises a main valve slide, a precontrol valve slide for controlling the main valve slide, as well as an auxiliary valve slide for controlling flow of pressure fluid through a pressure channel leading from a pump to a hydraulic consumer, for instance to fluid operated cylinder and piston means. The arrangement includes further a control conduit branching off from the pressure channel and leading over a throttle, the precontrol valve slide and the auxiliary valve slide, in which the latter is movable between two end positions under the influence of a spring and the hydraulic pressure in a pressure chamber and arranged to control passage of fluid through the control conduit, and two adjustable throttles in the control conduit, respectively formed by the auxiliary valve slide and the precontrol valve slide. The various elements of the control arrangement are constructed and connected to each other to avoid under all operating conditions a throttling action causing the pump to work against an excessively high pressure.
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