DISPLACED SLOT GATE WITH CURVILINEAR DISPLACEMENT TRAJECTORY Russian patent published in 2003 - IPC

FIELD: pipeline valves and fittings. SUBSTANCE: proposed gate is designed for closing air ducts and vacuum lines. It contains seat with slot through hole, and motion drive including bellows whose fixed stopper is made for connection with pressure building device. Shutoff member is installed on movable stopper. Bellows have outline in cross section whose longitudinal dimension along larger axis exceeds its cross dimension along smaller axis being made of two parts. With bellows compressed, planes passing through larger axes of inner contours of corrugations of said parts of bellows are displaced in opposite sides relative to plane passing through larger axes of outer contours of all bellows corrugations, outer contours of bellows corrugations are connected by cross bridges with formation of holes through which all parts of inner space of bellows communicate. EFFECT: simplified design. 2 cl, 4 dwg