Fluid handling – With casing – support – protector or static constructional... – Jacketed
Reexamination Certificate
2007-10-30
2007-10-30
Keasel, Eric (Department: 3753)
Fluid handling
With casing, support, protector or static constructional...
Jacketed
C137S613000, C251S315010, C251S315160
Reexamination Certificate
active
11201056
ABSTRACT:
A triple-valve internal blow out preventer having unitary construction is provided, each valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein the central opening may include an undercut. A protective coating may also be applied to both the external surface and the undercut of the ball to increase the durability of each of the valves.
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Mason David B.
Seneviratne Padmasiri Daya
Wells Lawrence
Christie Parker & Hale, LLP.
Keasel Eric
Price Craig
Varco I/P Inc.
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