The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1978
Filed:
Mar. 04, 1976
Cicero C Brown, deceased, late of Houston, TX (US);
Ramey L Brown, executor, Houston, TX (US);
Brown Oil Tools, Inc., Houston, TX (US);
Abstract
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.