Abstract: A first inlet port extends radially through a valve sleeve into an internal bore. A first outlet port extends radially outwardly through an outer periphery of the valve sleeve. A second inlet port on an opposed side of the first outlet port from the first inlet port, extends radially through a wall of the valve sleeve. A valve spool is received in the internal bore and has a first channel at an outer peripheral surface selectively communicating the first inlet port to the first outlet port. The valve spool has a second channel at the outer peripheral surface that communicates the second inlet port to an axial vent formed in an internal surface of the valve sleeve. The axial vent extends axially to communicate the second channel to the first outlet port. A pumping system is also disclosed.

Abstract: Heater leads for a leading edge resistive heating element are configured to accommodate the relative movement of the propeller blades to adjust propeller blade pitch. The heater leads each include a static portion and a dynamic portion. The static portion remains fixed relative to the rotating propeller during operation and the dynamic portion moves with movements of the individual blades to adjust pitch. The length of the dynamic portion accommodates the limits of movement and includes features that provide the desired performance and operational life.

Abstract: Heater leads for a leading edge resistive heating element are configured to accommodate the relative movement of the propeller blades to adjust propeller blade pitch. The heater leads each include a static portion and a dynamic portion. The static portion remains fixed relative to the rotating propeller during operation and the dynamic portion moves with movements of the individual blades to adjust pitch. The length of the dynamic portion accommodates the limits of movement and includes features that provide the desired performance and operational life.