| 摘要 |
A hermetically sealed hydraulic actuator comprises a spring loaded piston and cylinder, the position of the piston in the cylinder being controlled by the output of a constantly running fluid pump which withdraws oil from a sump in communication with the cylinder and discharges into the cylinder. The pump discharge may be more or less diverted from the cylinder to the sump by a diverter valve regulated by the movement of an electrically heated thermal element in the sump. The thermal element temperature is controlled by a suitable power supply circuit, which may respond to differences in a condition to be regulated by the actuator, and the effect of the element on the diverter valve for a given circuit response is adjustable by shifting the port of the diverter valve relative to the element. A screw accessible from the exterior of the sump shifts the diverter valve port.
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