RESILIENT SHELL FOR PIPELINE SHUTDOWN

摘要

FIELD: machine building.SUBSTANCE: resilient shell comprises cylindrical and two end parts and compressed air feed pipe. Cylindrical part outer surface is provided with a set of sealing annular ledges and separate annular ledge located closer to end part than said set of ledges for pressure to applied to said separate ledge in operation. Said separate ledge is located from extreme ledge of said set at the distance larger than that between ledges of the set and features height exceeding that of set ledges.EFFECT: better tightness.5 cl, 6 dwg