What is Servo valve?

Servo valve control the spool movement by electrical torque motor.It has feed back of spool movement.

What is the difference between servo and proportional valve?

Servo ValveProportional Valve
It is a closed loop system.
It has feed back for spool movement.
This is an open loop system.Feed back not available.
Servo valve has electrical torque motor
for spool movement.
It has spool movement like solenoid valve.
The power supply to coil is controlled by regulator.
ExpensiveLess cost.


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