An electro-hydraulic proportional actuator in which the actuator piston position is hydraulically controlled by fluid flow through solenoid valves operable by an electronic control system. An operator control provides an input voltage representing a desired piston position and a transducer generates a voltage representing the actual piston position. The difference between the input and output voltages generates a difference or error signal that is fed into a feedback system including a sample-and-hold circuit. A clock logic system is provided for transmi...
1. An electro-hydraulic proportional actuator, comprising: an actuator assembly having a double-acting, linearly-movable piston contained in a cylinder having a chamber at each end; a pair of three-way solenoid valves each of which has an actuator port, an inlet port and an outlet port; each end chamber of the actuator assembly cylinder being coupled to the actuator port of one of the valves, and each valve inlet port being coupled through a check valve to a fluid pressure source and the return ports being coupled to each other with the fluid flow ...
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