Fluid handling – Convertible – Units interchangeable between alternate locations
Reexamination Certificate
2005-04-04
2008-12-30
Rivell, John (Department: 3753)
Fluid handling
Convertible
Units interchangeable between alternate locations
C137S269000, C138S040000, C138S094000, C138S094300
Reexamination Certificate
active
07469709
ABSTRACT:
A three-wedge double block isolation chamber including a body with an internal chamber bounded by an inlet and an outlet having a wedge assembly positioned in the chamber. The wedge assembly may be configured as either a blind wedge assembly to block the flow of liquid through a pipeline; a flow-through wedge assembly to permit flow of liquid through a pipeline; or a meter wedge assembly to meter the flow of liquid through the pipeline. The wedge assembly includes an upstream wedge, a downstream wedge, and a force wedge. The wedge assembly seats in the internal chamber of the body. The upstream wedge and the downstream wedge each include a seal and are positioned respectively against the inlet and outlet. The upstream wedge and the downstream wedge each also include a tapered surface to mate the tapered surface of a force wedge such that when the force wedge is inserted between the upstream wedge and the downstream wedge, a force is applied so as to seal the upstream wedge against the inlet and the downstream wedge against the outlet, thereby producing to independent seals, one on each end of the internal chamber of the body. When the blind wedge assembly is positioned in the chamber, it provides a double block and seal to assist in the prevention of flow of a liquid through a pipeline past the isolation chamber.
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Bridgeford Stanley James
Embry Kenneth E.
Fellers Snider Blankenship Bailey & Tippens, P.C.
Kesta, L.L.C.
Rivell John
Rost Andrew J
Zingerman Scott R.
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