초록 ▼

An apparatus for sealing a clearance between a host pipe and a liner pipe. The liner pipe is fed into the host pipe and includes a tubular element forming a leading end of the liner pipe. It also includes a compressible seal which is adapted when compressed longitudinally to expand radially and is m

An apparatus for sealing a clearance between a host pipe and a liner pipe. The liner pipe is fed into the host pipe and includes a tubular element forming a leading end of the liner pipe. It also includes a compressible seal which is adapted when compressed longitudinally to expand radially and is mounted on the tubular element when in use. The seal moves freely with the element in the direction of feeding of the liner pipe. But when the liner pipe is retracted counter to the direction of feeding, the seal movement is arrested and the seal compressed longitudinally by the element so that the seal expands radially to engage the internal wall of the host pipe and seal the clearance.

대표청구항 ▼

1. Apparatus for sealing a clearance between a host pipe and a liner pipe which is fed into the host pipe, the apparatus comprising a tubular element located at a leading end of the liner pipe and a compressible seal located longitudinally adjacent to said tubular element adapted to expand radially

1. Apparatus for sealing a clearance between a host pipe and a liner pipe which is fed into the host pipe, the apparatus comprising a tubular element located at a leading end of the liner pipe and a compressible seal located longitudinally adjacent to said tubular element adapted to expand radially when compressed longitudinally and which is mounted on the element, the seal being mounted on the element and freely movable with the element in a direction of feeding of the liner pipe and wherein when the liner pipe is retracted counter to the direction of feeding further seal movement is arrested and the seal is compressed longitudinally by the element so that the seal expands radially to engage an internal wall of the host pipe and seal the clearance.