Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1994-05-20
1995-03-28
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
137318, 138 93, 138 94, 138 97, 30 94, 83 54, 83745, F16K 4300, F16L 5512
Patent
active
054008140
ABSTRACT:
A device blocks the flow of fluid in a pipe so that work can be done on the pipe downstream of the device. The device includes an installation unit and a blocking unit. The installation unit is sealed against the ambient when mounted on the pipe to permit drilling a hole into the pipe and the blocking unit includes an expandable body which is passed through the installation unit and on through the hole in order to temporarily block the flow of fluid in the pipe. The expandable body has a larger diameter than the internal diameter of a channel in the installation unit. The blocking unit includes a rod mounted in the holder to which a manual force is applied for distending the expandable body before insertion so that the expandable body has a diameter less than the diameters of both the channel and the hole thereby facilitating passage of the expandable body through the channel and hole into the pipe. The manual force is released and the rod is then withdrawn so that the expandable body assumes its initial shape within the pipe. Air under pressure can be applied to the expandable body so that the body tightly plugs the pipe thereby permitting work to be done on the pipe.
REFERENCES:
patent: 1946138 (1934-02-01), Gardner
patent: 3240227 (1966-03-01), Burkholder
patent: 3805844 (1974-04-01), Bacon
patent: 4127141 (1978-11-01), Ledonne et al.
patent: 4155373 (1979-05-01), DiGiovanni
patent: 4949744 (1990-08-01), Heed et al.
Ottesen Walter
Tigerholm AB
Walton George L.
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