Hsc Controls Inc.

Hydraulic Servocontrols Corporation

William P Robinson

A hydraulic servovalve including a valve body, a spool bore in the valve body, a spool in the spool bore, inlet and outlet conduits in the valve body, control conduits in the valve body, annular grooves on the spool for providing fluid flow paths between the inlet and outlet conduits and the control conduits, bores extending through the spool for providing additional fluid flow paths in addition to the fluid flow paths through the annular grooves, an inclined base on the valve body, a torque motor mounted on the inclined base, a flapper bore extending through the valve body transversely to the inclined base and lying in line with a diameter of the spool bore, a flapper in the flapper bore, and a filter bore in the valve body located laterally of the spool bore.

Hydraulic servovalve

A bi-stable electrically operated valve including a housing having inlet, outlet and return conduits, an intermediate conduit between the inlet and return conduits, a bi-stable electro-mechanical transducer having a flapper slidably mounting a first ball valve, first and second seats on the intermediate conduit, a third seat on the outlet conduit, the first and third seats being alternately engageable by the first ball valve to permit communication between the inlet and outlet conduits when the valve is open or between the inlet and return conduits when the valve is closed, a second ball valve, a piston for moving the second ball valve onto the second seat on the intermediate conduit, a conduit for effecting communication between the outlet conduit and the piston so as to cause the piston to drive the second ball valve onto the second seat when the inlet and outlet conduits are in communication, to thereby close off the inlet conduit from the return conduit, and a bleed opening between the inlet conduit and the intermediate conduit so as to provide equal pressure on opposite sides of the first ball valve when the valve is open and the first ball valve is on the first seat on the intermediate conduit.

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Lockport, NY, United States of America

William P Robinson