Proportional Electro-Hydraulic control valves
What are Electrohydraulic servo valves?
An Electro-Hydraulic Servo Valve (EHSV) is an electrically operated valve that controls how hydraulic fluid is ported to an actuator. Servo valves and servo-proportional valves are operated by transforming a changing analogue or digital input signal into a smooth set of movements in a hydraulic cylinder. Servo valves can provide precise control of position, velocity, pressure and force with good post movement damping characteristics.(*)
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Hydraulic Control Valves Series:
* Reference: Wikipedia