| 摘要 |
<p>The flow of fluid to a hydraulic load (18) is controlled by controlling a bleed-off path (31, 32) by means of a main valve (20) responsively to the difference between a first input force produced by a force motor (52) and a second (hydraulic feedback) force produced by a flow sensor (74) in the passage (33) leading to the load (18). The pressure difference across the flow sensor is applied by lines (75, 76 and 71, 70) to opposed feedback chambers (56, 55) to act on the pilot spool (40) upon which the force motor (52) acts.</p> |
