Electro-Hydraulic Servo Valve actuators, like pneumatic actuators, are made up of a piston that moves inside a hollow cylinder.
The cylinder is moved by an incompressible liquid supplied by a pump.
Electro-Hydraulic Servo Valves are utilized for high-frequency applications, while proportional valves are employed for general electrical control systems.
Open or closed-loop circuits are used in proportional valves, whereas closed-loop circuits are used in servo valves.
When compared to a proportional valve, servo valves are more accurate and reliable.
Higher pressure is required to achieve a high-frequency response from the servo valve.
The main distinction between servo valves and proportional valves is that servo valves feature a feedback system that can control the actuator, and the feedback system consists of sensing devices.
The main distinction between servo valves and proportional valves is that servo valves feature a feedback system that can control the actuator, and the feedback system consists of sensing devices.
The feedback system allows the controller to operate the actuator.
The construction of servo valves
The control motor, hydraulic amplifier, and main sliding valve are the three major components of servo valves.
The motor in electrohydraulic servo valves is made up of coils, magnets, and an armature.
The armature is supported by a flexure tube, which also serves as a fluid seal between the hydraulic and electromagnetic components.
A flapper is attached to the middle of the armature and is stretched towards the flexure tube.
The flapper has a nozzle on both sides, and the nozzle opening is controlled by the flapper action.
Servo valves are generally used for precise position control, and they are controlled by an electrical signal.
These valves are commonly employed in electrohydraulic systems because they allow the actuator or motor to be positioned using low-power electrical impulses.
To verify that the actuator does what the controller asks, a feedback system is used.
This feedback is obtained through the use of an electronic device, most commonly a transducer.
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