ISOLATION VALVES WITH MOVABLE ELEMENTS IN SEATS Russian patent published in 2009 - IPC F16K5/20 F16K3/20 

FIELD: pipeline valves.

SUBSTANCE: invention relates to valve engineering and is intended for using as isolation valves in pipelines transporting medium at any pressure parametre. The isolation valve contains body with inlet and outlet and outlet nozzles and two seats. The isolation gate is located between the said seat and can be driven or interact with movable seat elements. The isolation gate is represented with a ball plug or gate, parallel valve or wedge. The seats are rigidly fixed in the body. The movable seat elements are arranged so that they can make reciprocal motions along longitudinal axis of valve body and are provided with circular cylinders. The latter are connected to individually drive-controlled intensifying cylinders being enclosed into the valve body. The side wall of each circular cylinder is represented with two bellows of different diametre. The latter are placed concentrically with regard to the longitudinal axis of the valve body. Each intensifying cylinder is implemented as a set of shells in the corrugated form. The internal cavities of circular cylinders and corresponding intensifying cylinders are interconnected by pipe forming leak-tight cavities. The above mentioned cavities are filled up with liquid having unchangeable properties under operational conditions. The valve cavities where circular cylinders of movable seat elements are located, connection pipes and intensifying cylinders are permanently connected with flowing cavities of valve. The movable seat element and isolation gate drives are not interacted.

EFFECT: leak tightness not depending on transported medium pressure changes.

4 cl, 3 dwg