Abstract: Armature springs configured to be coupled to and bias an armature of a torque motor valve actuator to a null position are provided. The armature spring comprises a rigid central portion, opposed end portions, and a flexible portion intermediate the rigid central portion and each end portion. The rigid central portion, the opposed end portions, and the flexible portions define a variable cross section torsion bar with the flexible portions comprising reduced cross-sectional portions of the torsion bar relative to the rigid central portion and opposed end portions. Armature assemblies and torque motor valve actuators are also provided.

Abstract: Armature springs configured to be coupled to and bias an armature of a torque motor valve actuator to a null position are provided. The armature spring comprises a rigid central portion, opposed end portions, and a flexible portion intermediate the rigid central portion and each end portion. The rigid central portion, the opposed end portions, and the flexible portions define a variable cross section torsion bar with the flexible portions comprising reduced cross-sectional portions of the torsion bar relative to the rigid central portion and opposed end portions. Armature assemblies and torque motor valve actuators are also provided.

Abstract: A torque motor includes an armature support, a flapper, and a flexible metallic seal. The armature support comprises a base, an armature-flapper support, and a plurality of springs. The armature is coupled to the armature-flapper support. The flapper is coupled to the flapper support and to the armature, and extends through the first and third flapper openings, and extends at least partially into the second flapper opening. The flexible metallic seal surrounds a portion of the flapper, and has a first end, a second end, and a plurality of convolutions between the first end and the second end. The first end is disposed between and hermetically connected to the flapper and the armature, and the second end is disposed within the first opening and hermetically connected to the base.

Abstract: Position sensors, metering valve assemblies, and fuel delivery and control systems are provided. In an embodiment, by way of example only, a position sensor includes a rotor, a primary winding wound around the rotor, a stator surrounding at least a portion of the rotor and the primary winding, and a secondary winding disposed adjacent to the stator. At least one of the primary winding and the secondary winding comprises copper and nickel.

Abstract: Position sensors, metering valve assemblies, and fuel delivery and control systems are provided. In an embodiment, by way of example only, a position sensor includes a rotor, a primary winding wound around the rotor, a stator surrounding at least a portion of the rotor and the primary winding, and a secondary winding disposed adjacent to the stator. At least one of the primary winding and the secondary winding comprises copper and nickel.