Proportional and Servo Valve Technology - Moog Inc.

valves, relative to the performance of servo valves, manufacturers added linear variable displacement transducers (LVDTs) to proportional valves in order to sense the spool (or poppet) position. The output signal from the LVDT was fed back to the amplifier card. A summing amplifier on the amplifier card calculated the difference

  Technology, Valves, Servo, Amplifier, Proportional, Proportional and servo valve technology, Servo valves