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:
Feb. 09, 2016
Filed:
Dec. 11, 2012
Baker Hughes Incorporated, Houston, TX (US);
Mark S. Megill, Tulsa, OK (US);
Steve Rosenblatt, Houston, TX (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
A flapper equalizer plunger embodies a unitary coiled spring that is compressed by the flow tube to shift the plunger to equalize pressure across the flapper before the flow tube tries to move the flapper. The hydraulic control system then need only to overcome the force of a flapper pivot spring to swing the flapper 90 degrees to an open position behind the flow tube. The integral spring is produced with a wire EDM technique and can be symmetrical or asymmetrical around its periphery as a way of offsetting off-center impact from the bottom of the flow tube. The plunger can be rotationally locked if it is asymmetrical. The pitch can be constant or variable and the output force greatly exceeds the force provided by an independent coiled spring.