Pipeline stop

Details Pipeline stop Pipeline stop

2006-11-27

2009-12-08

Hook, James F (Department: 3754)

Pipes and tubular conduits

With closures and plugs

Double end

C138S089000, C138S094000

Reexamination Certificate

active

07628176

ABSTRACT:
A pipeline stop is used to temporarily plug a pipeline to allow repairs to the pipeline. The pipeline stop includes lateral sections expanded into a sealing position blocking flow through the pipeline. A central section is moved downwardly to expand the lateral sections. Inclined links transfer force from the central section to the lateral sections. As the central section moves downwardly, the links move from a first inclined position to a second, more nearly horizontal, position. Upward movement of the central section allows the lateral sections to retract, typically by use of springs.

REFERENCES:
patent: 600181 (1898-03-01), Smith
patent: 1134811 (1915-04-01), Berger
patent: 1769386 (1930-07-01), Orton
patent: 2285392 (1942-06-01), Cline
patent: 3170226 (1965-02-01), Larry
patent: 4314579 (1982-02-01), Wheatley et al.
patent: 4682631 (1987-07-01), Wilger et al.
patent: 7270139 (2007-09-01), Calkins et al.
patent: 7281543 (2007-10-01), Calkins et al.

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