Abstract: Apparatus for coordinating the positions of valves in a pair of air flow passages along a jet engine nacelle to control two rotary valves from a single linear actuator. Each of the valves is of a ball type which is rotatable within a housing to achieve variable flow control in accordance with the particular shape of the opening through the rotatable valve member which varies with valve member rotation. The valve member bore shape may differ for the two valves, as well as the angle of the linkage between the linear actuator and each valve, to achieve different flow control relationships for the two valves from the single actuator armature. Each valve incorporates a pressure balancing member at the inlet seal of the valve which results in a reduction of the force of the seal element against the rotatable valve member when the valve is in the closed position, thereby reducing the torque required to rotate the valve out of the closed position.

Abstract: A poppet is modulated between closed and full open positions by a brushless DC motor operating magnetically through a housing to drive a permanent magnet rotor which carries the poppet. The rotor is supported on several parallel cables which are stationarily fixed at one end and attached to the rotor at the other end, whereby rotation of the rotor twists the cables, causing axial foreshortening and axial translation of rotor and poppet. Axial translation is enhanced by placing a spacer between the cables, intermediate their ends. A permanent magnet ring is disposed around the valve seat directly axially attracting the rotor to a valve closed position.