PNEUMATIC LOGIC UNIT Russian patent published in 2000 - IPC

FIELD: logic units in pneumoautomatic systems. SUBSTANCE: pneumatic logic unit includes housing with chambers arranged in it and cover, membrane placed between housing and cover; valve having rigid center, rod and spring-loaded disc. In housing there are input and output ducts. Logic unit is provided with additional valve mounted in cover coaxially with main valve. Both valves (additional and main) have common rigid center. Disc of main valve is in the form of piston. Input duct of housing connected with under-piston space is selected according to condition that H = A or more than it, where H- piston stroke, A - distance from lower wall of input duct until piston surface at side of output duct in static state. Main valve has adjusting screw. Rigid center is combined with disc and rod of valve. EFFECT: possibility for passing pneumatic signal at output of logic unit. 3 cl, 1 dwg