Device for installing an in-line valve

A device for installing an in-line valve in a pipe having sidewalls, said device comprising a hollow coring bit with a cutting end and a driven end adapted for attachment to a boring shaft and a boring and support housing sealed to the pipe, said housing having first and second closed chambers communicating with the pipe where it is sealed to the housing, said first chamber having a passage for containing and supporting the hollow coring bit and directing the cutting end of the hollow coring bit against and through the sidewalls of the pipe cutting away sections thereof, said first chamber having a valve transversely dividing the first chamber into two sections and through which the hollow coring bit can be inserted and removed, said second chamber having a passage in alignment with the passage in the first chamber for receiving the cutting end of the hollow coring bit, said housing having means for reciprocating the hollow coring bit through the passages within the first and second chambers, said hollow coring bit having a pressure relief hole in the driven end, said pressure relief hole connecting the interior of the hollow coring bit with the interior of the first chamber to substantially equalize axial pressure on the driven end, said hollow coring bit forming means for plugging flow in the pipe when the cutting end of the hollow coring bit is in the second chamber whereby said hollow coring bit forms an in-line valve when the hollow coring bit is axially reciprocated between an open and a closed position.