| 摘要 |
<p>A hydraulic jack with an initial fast action followed by a slow regular action with controlled deceleration between has two annular discharge chambers (C1, C2). The first chamber (C1) is in line with a set of holes (T1 to T4) and the second (C2) is in line with a single hole (T5) for the respective fast and slow operations. These chambers are connected to a common discharge channel (E), the first, directly, and the second through a flow controller (1). The combined flow through all the holes (T1 to T5) ensures that the valve member (3) of the flow controller is permanently operating.</p> |
