BODYLESS GATE VALVE WITH CURVILINEAR TRAJECTORY OF MOTION Russian patent published in 2003 - IPC

FIELD: shut-off fittings; gate valves for shutting-off air and vacuum lines. SUBSTANCE: proposed gate valve has seat with holes and motion drive including bellows. Immovable blank of bellows may be connected with pressure building-up unit. Movable blank is provided with shut-off member. Axis of seat hole and axis of bellows in compressed state are located at angle . Bellows is not axisymmetrical: centers of outer and inner circles of some bellows corrugations do not coincide. EFFECT: simplified construction; reduced usage of material. 2 cl, 3 dwg