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US 6,644,408 B2Granted
Equalizing flapper for down hole safety valves
AssigneeBaker Hughes Incorporated
InventorJason B. Ives
Life of this patent
Estimating the term…
Abstract
An equalizer valve for a flapper in a subsurface safety valve is described. A tapered plunger is biased by compact spring disposed in the plunger bore. The spring is supported by a C-shaped ring extending into a peripheral groove around the plunger bore.
Claims20
An equalizing system for a flapper in a well valve comprising:
- a flapper having a bore therethrough;
- a plunger, having a longitudinal axis and an outer periphery about said axis, and extending through said bore and biased into selective sealing contact therewith, said biasing accomplished by an annularly shaped biasing member disposed in a space defined between said bore and about said periphery of said plunger.
An equalizing system for a flapper in a well valve comprising:
- a flapper having a cylindrical bore therethrough;
- a cylindrically shaped plunger, having a longitudinal axis and an outer periphery about said axis, and extending through said bore and biased into selective sealing contact therewith, a travel stop for said plunger disposed in an annular space in said bore defined between said outer periphery of said plunger and said bore.
An equalizing system for a flapper in a well valve comprising:
- a flapper having a cylindrical bore therethrough;
- a plunger, having a longitudinal axis and an outer cylindrical periphery about said axis, and extending through said bore and biased from within said bore into selective sealing contact therewith, said bore conforming to the shape of said periphery.
Dependencies are inferred from the claim text.