| 摘要 |
<p>A casing (21) accomodates therein a movable valve (22) adapted to be moved away from a valve seat (23c) by a hydraulic oil flowing through an oil-hydraulic circuit from a hydraulic cylinder (6) to an oil-hydraulic pump (7). In an event of oscillatory hydraulic pressures in the hydraulic cylinder (6), the hydraulic oil is returned through the oil-hydraulic circuit from the hydraulic cylinder (6) to the oil-hydraulic pump (7) via a second port, a communication path (23d), a minor gap (K) between the movable valve (22) and the valve seat (23c), and a first port. In this arrangement, the communication path (23d) allows for a smooth flow of the hydraulic oil from the second port into the movable valve (22). <IMAGE></p> |
