SERVO VALVES
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
Jun 25, 2015
app pub date -
Nov 26, 2014
filing date -
Dec 24, 2013
priority date (Note) -
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Abstract
An electrohydraulic servo valve generally comprises an electrical torque motor, a flexible member and a rigid beam arranged to control a flow of hydraulic fluid into a hydraulic block, and a spool slidingly mounted in the hydraulic block for axial movement in response to a differential pressure. The torque motor includes a drive member connected to the rigid beam and moveable to deflect the beam and flexible member in response to an electrical input. According to this disclosure, a feedback spring is directly connected to the beam so as to transmit a return force in response to movement of the spool. The feedback spring is a one-piece spring member fixedly attached to the spool and arranged to absorb radial displacement of the spool within the hydraulic block.
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