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US 6,547,007 B2Granted
PDF valve
AssigneeHalliburton Energy Services, Inc.
InventorsDavid D. Szarka, Henry E. Rogers
Life of this patent
Estimating the term…
Abstract
A differential float and cementing valve assembly used to position and cement casing in a well bore. A leaf spring and other components of the assembly are preferably constructed of composite materials and/or plastics that can be drilled up with polycrystalline diamond compact (PDC) bits.
Claims27
A drillable regulating valve assembly for regulating the back-flow of fluid through a flow passage, comprising:
- a seal area formed about said flow passage;
- a valve closure element movable into and out of engagement with said seal area for respectively closing and opening said flow passage to said back-flow of fluid;
- and
- a biasing element constructed of a composite material for urging said valve closure element against the back-flow of said fluid and toward engagement with said seal area.
1 more element
A regulating valve assembly for regulating a back-flow of fluid through a check valve, comprising:
- a regulating flow passage extending through a movable closure element of said check valve;
- a seal area surrounding said flow passage;
- a poppet valve closure element mounted on said movable closure element and movable along a rectilinear path for regulating opening and closing of said regulating flow passage;
- and
- a biasing spring for urging said poppet valve closure element in a direction to close said regulating flow passage.
2 more elements
Dependencies are inferred from the claim text.