BUTTERFLY GATE Russian patent published in 2009 - IPC F16K1/20 F16K31/53 

FIELD: pipeline valves.

SUBSTANCE: invention relates to pipeline isolation valves and is intended for using in oil production industry for the systems requiring internal cleaning of pipelines. The butterfly gate consists of a body, sealed seat, disc-shaped shutting-off device and pivoting shaft. The body is implemented with a cupola-shaped cavity. The disc is represented with a spherical side surface and fixed to the pivoting circular holder. The said holder is mounted on semi-axes having a shape of pin with supporting spherical surfaces. One of the pins is connected to the pivoting shaft. The shaft passes through the pivoting bushing. The pin is installed in pivoting bushing seat with eccentricity with regard to the above mentioned pivoting shaft. The pivoting bushing is coupled with toothed wheel centre of drive worm mechanism. The pivoting shaft is connected to the toothed wheel centre by means cams through the limit moment coupling installed on the pivoting shaft. The limit moment coupling is pressed to the toothed wheel centre by spring and adjusting nut located on the end of pivoting shaft.

EFFECT: ensured sealing and complete opening of straight-through channel.

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