Nozzle force feedback for pilot stage flapper

Details Nozzle force feedback for pilot stage flapper Nozzle force feedback for pilot stage flapper

F - Mech Eng,Light,Heat,Weapons

15

B

137/97

F15B 13/00 (2006.01) F15B 13/043 (2006.01) F16K 31/06 (2006.01)

Patent

CA 1160940

ABSTRACT A pilot stage for use in pilot pressure control applications includes a magnetic torque motor having an output torque in response to an input current, a flapper operated by the magnetic torque motor and responsive to the output torque, the magnetic torque motor being arranged to apply a resultant spring rate to the flapper, and first and second nozzles responsive to the output torque applied to the flapper for providing a differential output pressure proportional to input current, the first and second nozzles having a size sufficiently large to swamp out the resultant spring rate applied to the flapper so that the first and second nozzles apply a feedback force to the flapper sufficient by itself to substantially balance motor torque.

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