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Brown Oil Tools, Inc.

Ramey Lee Brown, Executor

Cicero C Brown, Deceased

Joe Russell Brown, Executor

A check valve assembly for permitting unrestricted flow in one direction and limited flow in the reverse direction comprising: a valve body having a longitudinal flowbore therethrough; a seat member carried by the valve body; a closure member carried by the valve body for movement from a normally open position, in which flow through the flowbore is unrestricted, to a closed position engaging the seat member, in which reverse flow through the valve body is prevented; and a reciprocal sleeve member carried by the valve body for movement between a first position, preventing movement of the closure member to its closed position, to a second position, allowing movement of the closure member to its closed position. The sleeve member may be provided with an annular pressure surface in fluid communication with the exterior of the valve body for applying a force to move the sleeve member from the first position to the second position in response to a greater pressure externally of the valve body than the pressure within the flowbore. In other embodiments the sleeve member may be attached to a first body portion of the valve body which telescopically engages a second body portion for limited axial movement relative thereto. In such an embodiment the sleeve member is movable from its first to its second position in response to limited axial movement of the first body portion.

Check valve assembly

A check valve assembly for use in a drill string to prevent reverse flow of drilling fluid through the string while permitting such fluid to be pumped downwardly through the well under normal conditions. The assembly includes: a valve body; a ball valve member, normally located out of the flow path in a side recess; a valve seat located above the valve member and means for controlling the rate of reverse flow of fluid required to move the valve member out of the side recess and against the valve seat.

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Houston, TX, United States of America

Ramey Lee Brown, Executor