D664-Z4306K/P05JXNF6VSX2-A
D662Z4341K/P02JXMF6VSX2-A
D662-4014/D01JABF6VSX2-A
D661-4651/1156-421 G35JOAA6VSX2HA
D661-4652/1156-421 G15JOAA6VSX2HA German made MOOG electro-hydraulic servo valve

FAQ:

Frequently Asked Questions (FAQ): Moog Electrohydraulic Servo Valves

1. What is an Electrohydraulic Servo Valve?

An electrohydraulic servo valve is a precision component that acts as an interface between the electrical control system and the hydraulic power system. It receives a low-power electrical analog signal and converts it into a proportional, high-power hydraulic output (flow and pressure). This makes it a crucial control core in electrohydraulic servo systems, responsible for both electrical-to-hydraulic signal conversion and power amplification .

2. How does a Moog Servo Valve work?

A Moog servo valve typically consists of a polarized electrical torque motor and a two-stage hydraulic amplifier .

• First Stage: The torque motor deflects an armature and a flapper attached to it. This flapper moves between two nozzles, creating variable orifices that control the pressure on either end of the second-stage spool .

• Second Stage: The differential pressure moves the spool, which then controls the flow of hydraulic fluid to the actuator. A feedback spring, connected to the flapper and engaging the spool, creates a force that balances the input signal torque, ensuring precise spool positioning proportional to the electrical command .

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