| 摘要 |
<p>Prior art interrupted series type load sensitive hydraulic systems have not had the capability of both providing full speed simultaneous vehicle cornering and implement correction while preventing the same when the implements are operating at a high pressure level, and preventing low torque motor stall. Herein, an input flow path delivers pressurized fluid flow from a source to a first priority (steering) circuit. A series flow path delivers the output flow from the circuit to an implement circuit. A parallel flow path delivers a portion of the flow from the source to the implement circuit. A valving structure is in the series flow path. The valving structure is opened in response to load pressure in the implement circuit being at or below a selected value and is closed in response to the load pressure in the implement circuit being above said value. Generally, flow through the parallel flow path is blocked when differential pressure in the steering circuit is below a specified value. High speed turning and implement correction are provided at low pressures and are prevented when the implement is operating at high pressure level. Low torque motor stall is prevented. Utilization of vehicle horsepower is enhanced with the selectable series/parallel circuitry.</p> |
