Patent ID: 8783291

Claim:
A two-stage electrohydraulic servo valve with a first stage ( 1 ), which operates as pilot stage and includes a movable nozzle tube ( 10 ), and a second stage ( 2 ) which operates as power stage, wherein the first stage ( 1 ) additionally comprises an integral a torsion element ( 11 ), with the nozzle tube ( 10 ) of the pilot stage ( 1 ) mounted upon and guided by the integral torsion element ( 11 ) and an oil supply of the movable nozzle tube ( 10 ) integrated in the torsion element ( 11 ), a base plate ( 17 ), with opposite ends of the integral torsion element ( 11 ) affixed to the same base plate ( 17 ), and the second stage ( 2 ) comprises a control piston or slide ( 3 ) reciprocally mounted therein and a return spring ( 6 ) engaging the control piston or slide ( 3 ) and firmly connected with the nozzle tube ( 10 ) to generate an increasingly reverse torque on the nozzle tube ( 10 ) until the nozzle tube ( 10 ) swivels back into vertical neutral position.