CUT-OFF DEVICE Russian patent published in 2005 - IPC

FIELD: mining art, in particular, petroleum-gas industry, designed for use in the mouth equipment for oil-gas wells in operation of oil pipe-lines, water conduits, gas conduits.

SUBSTANCE: the cut-off device has a body with ducts for passage of liquid. The body is made of two aligned branch pipes. The inner ducts of the branch pipes are hydraulically coupled by radial holes to a by-pass bush. The bush is installed for motion relative to the body axis. The body branch pipes are interconnected through a threaded connection to the centering surfaces. Flanges are made at the ends of the branch pipes. Annular grooves are made on the inner diameter of the by-pass bush for flow of liquid. The annular grooves are hydraulically connected by intersecting holes. These holes are made in the wall of the by-pass bush. Open grooves are made on the outside diameters of the flanges. A crosspiece with a central hole for the eccentric with control levers is positioned in these grooves, it connects the body to the flanges. The eccentric is engageable with the by-pass bush through a seat for combination or overlapping of the radial holes and annular grooves at rotation of the control levers.

EFFECT: enhanced reliability of device operation, reduced force of control in service, provided maintainability and competitionability.

2 cl, 2 dwg