Servovalves and Proportional Valves

Servovalves and Servo-Proportional Valves are electrohydraulic, continuously acting valves that transform a changing analog or digital input signal into a stepless hydraulic output (flow or pressure). 

The term servovalve describes a valve design with bushing spool assembly, characterized by high precision metering edges. The term servo-proportional describes valves with a spool-in-body design.

Moog valves provide precise control of position, velocity, pressure and force.

Industrial Servovalves and Servo-Proportional Valves

Moog is a leader in designing, manufacturing, and selling high performance hydraulic valve products. With over 50 years experience producing servo and proportional valves for the industrial market, our products are legendary for reliability and accuracy.

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Moog Servovalve History

In 1950 W. C. Moog, Jr. developed the first two-stage servovalve using a frictionless pilot stage. A flapper and nozzle variable orifice was used in conjunction with a fixed orifice to drive a second-stage spool in a three-way mode. The flapper-nozzle valve was driven by a torque motor, and spool position was achieved by a spring acting  directly on the spool. 

The  advantages of thus construction were an appreciable reduction in valve threshold, and a high dynamic response because of the lower mass of the first-stage parts. Frequency response on the order of 90” at 100 Hz was possible allowing for the use of servovalves in high gain position servos.