FIELD: pipeline transport.
SUBSTANCE: folding plug comprises flexible shell made of a folded pack provided with a connecting pipe. The pack expands and shrinks, when fluid is supplied to and is discharged from the pack, respectively. In addition, the plug is provided with a pipe, which is arranged inside the flexible shell and connects the openings in the opposite faces of the pack. When the shell is shrunk, the pipe is straighten. The pipe is arranged along the central axis of the shell and is corrugated or reinforced.
EFFECT: enhanced reliability.
3 cl, 5 dwg
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