Abstract: A shear orifice valve including a valve body, a torque motor mounted on the valve body, fluid inlet ducts in the valve body, a plurality of first opposed metering orifices in the valve body in communication with the first fluid duct, a plurality of second opposed metering orifices in the valve body in communication with the second fluid duct, an armature in the torque motor, a metering arm having first and second faces on opposite sides thereof coupled to the armature with the first and second faces located between the first and second opposed metering orifices, and a third fluid duct in the valve body for either receiving fluid simultaneously from the first orifices in response to movement of the metering arm in a first direction or for conducting fluid simultaneously to the second orifices in response to movement of the metering arm in a second direction.

Abstract: A valve including a valve body, a torque motor mounted on the valve body and including an armature, a metering arm connected to the armature and extending into a first bore in the valve body, second and third coaxial bores in the valve body extending transversely to the first bore and being intersected by the metering arm, a pair of metering orifice members in the second and third bores with openings adjacent the metering arm, and fourth and fifth coaxial bores in the valve body having an axis which intersects both the metering arm and the axis of the second and third bores so as to permit viewing of the metering arm relative to the metering orifice members, a loose connection between the torque motor and the valve body to permit adjustment of the metering arm relative to the metering orifice members, and adjustment structure for permitting the axial and rotational orientation of the metering orifice members within the second and third bores.

Abstract: A hydraulic servovalve including a torque motor and a valve housing containing a fluid inlet conduit in communication with a spool chamber, a spool within the spool chamber, a filter chamber within the spool, a filter within the filter chamber dividing the spool chamber into a first filter chamber section in communication with the fluid inlet conduit and a second filter chamber section on the opposite side of the filter from the first filter chamber section, a conduit within the housing for effecting communication between the second filter chamber section and nozzles associated with a flapper coupled to the torque motor, and the first filter chamber section being in communication with a fluid outlet in the valve housing. Also the spool can preferably have a notch therein for effecting direct communication between the fluid inlet and the fluid outlet in addition to the communication which is effected therebetween through the first filter chamber section of the filter chamber.

Abstract: 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.

Abstract: A torque motor including a frame of soft magnetic material, such as soft iron, spaced first end portions on the frame, an armature which is a magnet, spaced second end portions on the armature, a mounting member for mounting the armature on the frame for allowing motion of the armature relative to the frame, each of the end portions of the armature including a north pole and a south pole, air gaps between the end portions of the frame and the end portions of the armature, a coil mounted on the frame, and the armature being in the form of a laminate with a central layer being a rare earth magnet between outer layers of magnetic material.

Abstract: A valve features a valve member adjustably fixed to a mounting member during assembly of the valve to provide for accurate repetitive seating of the valve member in fluid sealing engagement with a valve seat.