SEWER PIPE-LINE REVISION ASSEMBLY Russian patent published in 2002 - IPC

FIELD: constructions of revision assemblies of internal sewer pipe- lines of buildings made of polymeric materials providing an access inside the pipe-line for inspection, cleaning, etc. SUBSTANCE: the revision assembly has a pipe of polymeric material with a branch pipe with a male thread positioned at an angle to it, screwed on the pipe is a cap and a hub formed on the pipe section adjoining the branch pipe, the inside diameter of the hub cavity exceeds the outside diameter of the pipe outside the hub, it is made with annular beads on the outer surface and an annular broadening on the side of the end for accommodation of a gasket. In the point of arrangement of the gasket the hub on the external side is made with a tapered side surface, the cavity of its annular broadening is made open from the end and restrained by an additional detachable pressure cover with a central hole with a tapered side surface corresponding to the indicated taper of the hub, limited in the lesser diameter by an annular surface, whose inside diameter is not less than the pipe diameter outside the hub, and in the larger diameter - by an internal annular flange of a segmental cross-section. The longitudinal axis of the cap is positioned at a distance equal to 1.0 to 1.75 of the pipe diameter in the point of formation of the hub from the point of the detachable pressure cover mostly removed in the longitudinal axis. The section of the tapered side surface exceeds the depth of gasket arrangement in its annular broadening and forms a groove between the base of the tapered section and the pipe annular bead that is closest to it for arrangement of the annular flange of the detachable cover, the distance between whose annular surface and its annular shoulder exceeds the depth of gasket arrangement. The diameter of the bead forming the groove exceeds the diameter of the bead positioned on the hub at least by the pipe wall thickness in the point of the hub but not exceeds the larger diameter of the detachable cover having a tapered side surface. The invention is developed in the dependent claim. EFFECT: enhanced reliability of operation, maintainability and improved operating characteristics, improved adaptability to manufacture. 2 cl, 3 dwg