| 摘要 |
<p>PURPOSE:To enable revolving of a revolving body without interference through the operation of other movement bodies, by a method wherein a priority type pressure compensating valve, which supplies pressure oil from an existing pump with priority to a revolving motor, and feeds a surplus oil to other movement bodies, is mounted. CONSTITUTION:A hydraulic circuit for a power shovel, provided with cylinders 19, 20, and 30 moving a bucket C to a desired position and a revolving motor 7 moving a revolving body D, is equipped with two variable volume type pumps 1, 1' and two switching valve blocks (a) and (b). A priority type pressure compensating valve 37, which feeds a first pump discharge amount preferently to the revolving motor 7 and supplies only a surplus oil to a right running motor 14, a boom cylinder 20, or an arm cylinder 19, is mounted at the first block (a). A decomposition type pressure compensating valve 42 is installed at a branch pressure line 8 branching from the valve 37. Meanwhile, compensating valves 37' and 42' are mounted at the block (b) in an approximately similar manner.</p> |
