These valves are a series of three- or four-way electrohydraulic servovalves (EHSVs) commonly used to control position, velocity, and force in a variety of hydraulic system, fuel system, and engine control applications. Driving aerospace hydraulic actuators or motors in closed-loop servosystems, the EHSVs provide flows to 10 GPM at 1000 psi drop across the valve. The first stage is driven by an efficient force motor that is balanced so that lateral accelerations have little effect on output flow.