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. 07, 2002
Filed:
Jul. 23, 2001
Roy R. Vann, Flint, TX (US);
Other;
Abstract
A circular check valve with a central aperture is disclosed. The preferred use as a standing head valve for reducing hydrostatic pressure in a wellbore being produced by a reciprocating pump is discussed. In this application the circular check valve allows the a sucker rod, or equivalent source of pumping energy, to pass. The device is attached to the pump barrel in communication with pump chambers and the production tubing. The check valve device isolates the pump internals and the formation from the hydrostatic head of the produced fluid. The device eliminates pump-off and thus fluid pounding resulting in more efficient pumping and less maintenance. Other uses for the circular check are described.