How does a servo valve work


Servo valve

These valves control large flows of oil using small electrical signals. A small torque motor regulates the connected control oil, whereby the slide of the main stage is adjusted. Often designed in several stages

Comparison of servo valve with proportional valve

In general, the same functions can be carried out with proportional valves as with servo valves. The advantages of the servo valves are their higher accuracy and speed. Proportional valves, on the other hand, have a simpler design and are more robust and more maintenance-friendly, as the oil has to be filtered less and the maintenance intervals are longer.

The servohydraulics are often used on control loops, i.e. in connection with a measuring system and an analog controller.

Proportional valve

Servo valve

  • More robust against pollution
  • Cheaper in price
  • Easier to maintain
  • high responsiveness and controllability
  • Smaller reaction or step response time
  • Minor hysteresis
  • Lower power consumption