Double block and bleed plug

Details Double block and bleed plug Double block and bleed plug

2007-11-07

2010-11-30

Hook, James F (Department: 3754)

Pipes and tubular conduits

With closures and plugs

Lateral opening

C138S089000, C138S090000, C138S091000, C138S094000

Reexamination Certificate

active

07841364

ABSTRACT:
A pipe plug comprised of two, pivotally connected plugging heads, each plugging head having a sealing element, which work in combination to double block and bleed a pipe. The first sealing element prevents flow of product in the pipe and the second sealing element captures any leakage past the first sealing element and forces that leakage out through a fitting. A stabilization pad, connected to a flange on a nosepiece of each plugging head, prevents deformation of the sealing elements. A spring-loaded pivot arm connected to the second plugging head allows the yoke that connects the two plugging heads to rotate freely. An outward-facing raised taper projection on the pivot arm, along with a guide wheel connected to the first plugging head, prevent the yokes and plugging heads from becoming entrapped during their installation in or removal from the pipe.

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International Search Report and Written Opinion (PCT/US08/81922); issued Jan. 21, 2009 by the International Search Authority (ISA/US); 10 pages.
International Search Report and Written Opinion issued by the International Searching Authority (ISA/US) on May 28, 2009 in PCT/US09/38272 (11 pgs).

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