METHOD AND DEVICE FOR BLOCKING LIQUID IN PIPE Russian patent published in 1997 - IPC

FIELD: repair of pipe lines. SUBSTANCE: position control mechanism 2 is mounted on pipe 1 and hole is drilled in pipe at tightness retained. Expansible body 8 may be introduced in pipe 1 by means of shut-off mechanism 7 located in pipe 9 for temporary cutting-out of flow of liquid in pipe. Expansible body is supported by means of this mechanism during and after introduction and especially in course of and after its expansion to withstand flow of liquid. EFFECT: increased ability of device to withstand high pressure of liquid flowing through pipe. 5 cl, 5 dwg