| 摘要 |
711,369. Hydraulic machines. GLENNY, A. P., SPENCER, D. L., and SPERRY GYROSCOPE CO., Ltd. Aug. 20, 1952 [Sept. 11, 1951]. No. 21404/51. Class 69 2) In a hydraulic power actuator which may be used only intermittently, a low pressure liquid supply 17 is arranged to be connected to the system to remove accumulated air. The clearing fluid passes through a spring loaded valve in the piston 3 biased to open when the pressure difference across the piston faces is small. The clearing valve is closed when the working pressure difference exists. A valve 19 prevents clearing liquid from escaping through the passage 9. |
