| 摘要 |
<p>The control (S) has a three-way pressure maintenance valve (4) arranged between a pump (P) and a pressure connector (10) of a three position-slide control valve (3) i.e. pressure regulating-control valve. The maintenance valve is designed with a working fluid-discharge path (11) to a reservoir (R). The path connects the connector with the reservoir, in a blocking position of the maintenance valve. A load pressure signal circuit of the control valve is alternatively released at the reservoir for desired releasing of a hydro-motor (M) via the path in the maintenance valve. The pressure maintenance valve is operated as a proportional feed control unit via an active releasing of the load pressure signals.</p> |
