Patent ID: 7455074

Claim:
An electro-hydraulic servovalve (EHSV) comprising: a nozzle; a motor operably connected to the nozzle for controlling the position of the nozzle; a spool having first and second ends slidably mounted in a sleeve having first and second ends and a first land near said spool first end; a first passage extending from near said nozzle to the first end of said sleeve; a second passage extending from near said nozzle to the second end of said sleeve; and a latching passage near said first end of said sleeve; said motor having a null bias tending to direct said nozzle toward said second passage and said spool toward a first fail-safe position; and said first land blocking said latching passage when a current to said motor is below a predetermined level and said first land opening said latching passage to said sleeve first end when said current exceeds said predetermined level to drive said spool to a second fail-safe position different from said first fail-safe position.