Electro fluidic actuator
 An electro-hydraulic (EH) actuator for converting electrical inputs into hydraulic output signals is described. The actuator features a pressure balanced design which permits operation at high absolute pressures without performance degradation. Internal portions of the EH actuator are filled with a non-conducting fluid, while a flexible diaphragm provides a movable interface between the fluid and the environment in order to equalize the internal and external pressures on the actuator. 
The United States of America as represented by the Secretary of the Army
Y G G
Y10T G01V G10K
additional inventional inventional
Allen B.
Holmes