APPLIANCE TO SHUT OFF AIR FLAP OF PIPELINE Russian patent published in 2020 - IPC F16L55/136 F16L55/132 

FIELD: transport machine building.

SUBSTANCE: invention relates to devices used in pipeline transport for shutting off or plugging of a plunger connected to an operating pipeline. Device is made in form of removable overlapping head. Head comprises a lower cylindrical sleeve with slots and threaded axis, wedges made in the form of a wedge and having a threaded notch on top, upper cylindrical bushing with upper inner central hole in form of hexagon and with base, which bottom is thread in form of spiral of left wrapping from axis. Lower clamp is conjugated with lower and upper cylindrical bushings. Spring is installed in cavity between upper cylindrical bushing and lower clamp. Upper clamp is coupled along inner surface with lower clamp outer surface to slide therein. Sealing ring is fitted in upper clamping groove. Hexagonal nut with collar is inserted into hexagon of upper cylindrical bushing with possibility of movement and fixed on threaded axis of lower cylindrical bushing. At that, lower cylindrical bushing is made with external cylindrical wall and holes for attachment screws with lower clamp, having collar for resilient sealer seating. Overlapping head is installed in the nozzle of the plunger, which is made with the lower groove for planting and cracking of the blocks.

EFFECT: technical result is improvement of reliability of fixation of overlapping head in branch pipe, which acts under pressure of pipeline at operations of overlapping or plug of plunger.

1 cl, 2 dwg