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A servo valve receives pressurized hydraulic fluid from a source, typically a hydraulic pump. It then transfers the fluid to a hydraulic cylinder in a closely controlled manner. Typically, the valve will move the spool proportionnaly to an electrical signal that it receives, indirectly controlling flow rate.
Here, small valves were attached to the original control cables, controlling the flow of oil into an associated actuator connected to the control surface. One of the earliest fittings of a hydraulic boost system was to ailerons on late-war models of the P-38L, removing the need for great human strength to achieve a higher rate of roll. [2]
In April 1950 Bill Moog (cousin of Robert Moog, inventor of the Moog synthesizer) applied for a patent for the electrohydraulic servo valve (later called a "Moog Valve"), a device to control hydraulic pressure for fine control of actuators. The US patent 2625136 was issued in January 1953.
The control signal is relatively low in energy and may be voltage, electric current, pneumatic, or hydraulic fluid pressure, or even human power [clarification needed]. [3] In the electric, hydraulic, and pneumatic sense, it is a form of automation or automatic control .
Globe control valve with pneumatic actuator and "positioner". This is a servo which ensures the valve opens to the desired position regardless of friction. A common type of servo provides position control. Commonly, servos are electric, hydraulic, or pneumatic.
If the electrical part of the control should fail, an EEC will revert to a standard hydromechanical fuel control. Full-authority digital engine control (FADEC): A digital computer which controls a servo-operated fuel valve. In this case the power lever is only electrically connected to the fuel control.