| 摘要 |
<p>A crash barrier system is provided that generally includes a hydraulic actuator driven piston operably connected to a hydraulic circuit and the crash barrier. In general, the hydraulic circuit includes a normal-UP and normal-DOWN section, an emergency- UP section, and an overpressure relief sub-system. In order to automatically provide corrective action in the event of an overpressure condition, the overpressure relief sub¬ system includes an external pressure relief valve that is connected to the hydraulic circuit. Upon occurrence of condition that causes the hydraulic fluid pressure to exceed a predetermined value, hydraulic fluid is released through the pressure relief valve to maintain the pressure at or below the predetermined value.</p> |
