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Proportional Valve and Servo Valves

 The use of electronics in today’s technology has increased in controlling various actuating systems such as hydraulic and pneumatic systems in process industries and has naturally led to greater in interest in servo and proportional valves.

Both these servo valves and servo proportional valves are electrohydraulic and electro-pneumatic continuously acting type valve that transforms a varying analog or digital input signal into a step less output signal. This signal may be a flow or pressure signal.

These Servo valves and Servo-Proportional Valves are electrohydraulic valves,

These are continuously acting valves that transform a changing analog or digital input signal into a step-less hydraulic output (flow or pressure).

  • The term servo valve defines a valve design that consists of a bushing spool assembly Indicated by high-precision metering edges.
  • Basically, the name servo valve relates to the term servomechanism, which means that the valve is constantly monitored to control its motion.
  • The name proportional describes any action where only one parameter varies in some proportion to another.
  • It is a continuously variable, electrically modulated, directional control valve with less than 3% center overlap.
  • Servo valves are used in conjunction with closed-loop systems and advanced electronics
  • Servo valves function with greater accuracy, very high repeatability, minimum hysteresis, and with a very high-frequency response.
  • But servo valves are more expensive.
  • A servo valve or pressure control valve is commonly used for controlling the pressure within the circuit through a directional valve in some cases.
  • The load cell or pressure transducer senses force or torque
  • The servo amplifier analyses the feedback signal from the sensor to control the valve.
  • Servo valves are classified as.
  • A single-stage servo valve is a directly regulated valve.
  • Two valve stages servo valves are comprised of a pilot stage and a final or main stage.
  • Three-stage servo valves are similar, except that the pilot itself is a two-stage servo valve.
Proportional Valve


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