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![Why do so many proportional Electro Hydraulic Servo Valve have lower hysteresis than servo valves do?](https://fortunetelleroracle.com/public/index.php/upload/media/posts/2021-12/01/why-do-so-many-proportional-electro-hydraulic-servo-valve-have-lower-hysteresis-than-servo-valves-do_1638366425-b.jpg)
The reason for this is that many Electro Hydraulic Servo Valve rely on a feedback wire or spring to perform spool position proportioning.
The employment of an LVDT spool position sensor with electronic feedback is common in proportional valves, resulting in a "tighter" spool position control loop and lower hysteresis.
What is a hydraulic sequence valve?
Sequence Electro Hydraulic Servo Valve regulates the operation of two branches in a circuit, allowing one unit to automatically start the operation of the other. This is accomplished by a sequence valve put in each landing gear actuation line.
Read More @ https://cmiinfonest.blogspot.com/2021/12/how-does-electro-hydraulic-servo-valve.html