Abstract: A servo valve has a heatsink housing with a plurality of external fins. The heatsink housing contains an electromagnet arrangement and a valve arrangement. The electromagnet arrangement has a magnet assembly, a coil assembly, pole pieces, and an armature acted upon by flux generated by the electromagnet. A conductive support member connects the coil assembly to the heatsink housing. The valve arrangement has a valve member driven by the armature to control flow between an inlet port and an outlet port. The valve arrangement is positioned in the heatsink housing on an opposite side of a seal plate from the electromagnet arrangement. The support member holds the coil assembly spaced from the seal plate and in a thermally conductive path to the heatsink housing.

Abstract: A servomechanism has a jet pipe mounted by a flexure pivot driven by an electromagnet to control the position of the jet pipe. A fixed seal tube surrounds the armature and keeps the coil isolated and dry. The flexure pivot has two parts that can move with respect to one another. The jet pipe can be fixed with respect to one part and movable with respect to the other such that when the electromagnet armature moves pivotal motion is imparted to the jet pipe. A multi-port jet receiver receives media from the jet pipe in different orifices dependent upon armature position. That in turn can extend or retract an actuator, such as a piston, depending upon which receiver orifice receives greater pressure. A feedback mechanism can link the actuator to the jet pipe to provide feedback input used to improve the accuracy of the device.