U.S. Patent Specifications

Abstract

In a unit for controlling aircraft equipment a casing, a main sliding control valve for said equipment mounted in said casing, said casing being formed to include a bellows housing at each end of said control valve, a bellows in each housing connected to a respective end of said control valve, an atmospheric pressure passage to the interior of each of said bellows, a cylindrical boring in said casing, pressure supply passages between each bellows housing and the walls of said boring, a vacuum pump, pressure supply passages from the wall of said boring leading to said vacuum pump, a passage from the wall of said boring leading to an atmospheric pressure connection, a cylindrical value housing inserted within said boring, said valve housing including an axial passage forming a valve chamber, openings in said valve housing to complete communication between said chamber and each of said pressure supply passages, an additional opening in said housing leading from said valve chamber to the atmospheric pressure passage, a sliding pressure control valve in said chamber for controlling said pressure supply passages and pressure responsive means for actuating said sliding pressure control valve whereby control is exercised over said main control valve.

Citation

(1944), "U.S. Patent Specifications", Aircraft Engineering and Aerospace Technology, Vol. 16 No. 9, pp. 275-276. https://doi.org/10.1108/eb031170