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US 5,850,881 AGranted
Drill pipe float valve and method of manufacture
AssigneeBaker Hughes Incorporated
InventorsJohn E. Rodger, Randle E. Ford
Life of this patent
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AssigneeBaker Hughes Incorporated
InventorsJohn E. Rodger, Randle E. Ford
Estimating the term…
A float valve 10 includes a valve body 12 for sealing engagement with a float sub 20 having threads for threaded engagement with an oilfield tubular. A valve element 40 includes a stem 50, 70 and a valve cone 52, 80 secured thereto. The valve cone is configured for sealing engagement with a seat 58 on the valve body. An elastomeric seal 48 may also be provided for sealing engagement with the valve body. The stem 50, 70 and the cone 52, 80 are preferably interconnected by a shrink-fit operation, wherein the cone is heated so that a cylindrical recess within the cone expands, while at least a front end 52, 72 of the stem 50, 70 is cooled so that its diameter is reduced. The shrink-fit operation forms a surprisingly reliable interconnection of a float valve stem with a cone, and substantially increases the life of the downhole float valve.
A method of forming a valve member axially movable within a valve body of a float valve positionable downhole for sealing engagement with a float body within a wellbore, the valve body having an external seal for sealing engagement with the float body and an internal annular seat secured to the valve body and formed about a central axis of the float valve for sealing engagement with the valve member, the method of forming the valve member comprising:
A method of forming a valve element axially movable within a valve body of a float valve positionable downhole for sealing engagement with a float body within a wellbore, the valve body having an external seal for sealing engagement with the float body and an internal annular seat secured to the valve body for sealing engagement with the valve element, the method of forming the valve element comprising:
Dependencies are inferred from the claim text.