US 4,285,363 AGranted

Control valve construction

AssigneeHydraulic Servocontrols Corporation

InventorHarvard B. Kolm

Life of this patent

Estimating the term…

Loading patent…

Abstract

A servovalve including a base, first and second flappers mounted on the base and attached to first and second armatures, respectively, first and second nozzles on the base for discharging fluid, third and fourth nozzles on said base for receiving fluid from the first and second nozzles, respectively, first and second springs for normally biasing the first and second flappers, respectively, into positions for effectively preventing flow of fluid from the first and second nozzles, torque motor structure including first and second coils operatively associated with the first and second armatures for simultaneously causing either one of said flappers to move away from its associated nozzle while the other flapper moves into a more closed relationship with its associated nozzle depending on the direction of current flow through said coils, and gain adjustment blocks mounted on the first and second armatures.

Claims13

Dependent claims

A servovalve comprising a base, first and second flappers mounted on said base, armature means coupled to said first and second flappers, respectively, first and second nozzle means on said base for discharging fluid, third and fourth nozzle means for receiving fluid from said first and second nozzle means, respectively, means for normally biasing said first and second flappers into position for effectively preventing flow of fluid from said first and second nozzle means, respectively, and coil means operatively associated with said armature means for simultaneously causing said first flapper to move away from said first nozzle means while said second flapper remains in position for effectively preventing flow through said second nozzle means when current flow through said coil means is in a first direction, and for causing said second flapper to move away from said second nozzle means while said first flapper remains in position for effectively preventing flow through said first nozzle means when current flow through said coil means is in a second direction which is opposite to said first direction.

Dependencies are inferred from the claim text.