RUBBERIZED CORD DEVICE FOR SHUT-OFF OF PIPELINES AND METHOD OF ITS MANUFACTURE Russian patent published in 1995 - IPC

FIELD: repair of pipelines. SUBSTANCE: end walls are made of separate radially directed and partially overlapping one another strips of rubberized cord fabric with thickened ends unbent along the axis and going behind the cylindrical shell, shell reinforcing layers overlapped in the area of the cylindrical shell in such a manner that the extreme external and internal layers of the shell and strips smoothly bend round the adjacent layers having a shorter length. In the process of manufacture the cylindrical and end parts are assembled separately, and a thin-walled one-time curing bag is installed on the end part with a valve, then the cylindrical and end parts are joined by means of centrifugal forces, after which the item is vulcanized. EFFECT: facilitated procedure. 7 cl, 9 dwg