| 摘要 |
<p>A hydraulic system for a pavement cutting machine (11) controls the engagement and disengagement of a rotating blade (7) with a pavement surface (15). A proportional-flow manual-release valve (37) is arranged in series with a pressure-compensated maximum-flow control valve (41) to allow a rapid raising of the blade (7) and an initial relatively rapid lowering of the blade followed by a controllable slower blade descent.</p> |
