| 摘要 |
<p>PURPOSE:To perform the reset of a hydraulic actuator speedily and surely by giving a negative pressure to the pressure receiving part of the hydraulic actuator when the oil pressure therein rises to a specified value or more. CONSTITUTION:A pressure switch 6 is connected to a pipe passage which connects a booster 2 to a hydraulic actuator 44, and the output of the pressure switch 6 is input to a changeover valve controller 8, while an aspirator 4 is connected parallelly to the booster 2. The oil pressure in the hydraulic actuator 44 is detected by the pressure switch 6, and the aspirator 4 is driven when the oil pressure in the hydraulic actuator 44 rises to a specified value or more, and a negative pressure is given to the pressure receiving part of the hydraulic actuator 44 through a flexible pipe 43 for pressurizing. The reset of the actuator 44 is speedily and surely performed regardless of the length of the flexible pipe 43.</p> |
