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:
Nov. 24, 2015
Filed:
Nov. 20, 2012
Dresser, Inc., Addison, TX (US);
Thomas Henry Cunningham, Canton, MA (US);
Christopher Edward Wolfe, Niskayuna, NY (US);
Nuo Sheng, Schenectady, NY (US);
Xuele Qi, Niskayuna, NY (US);
Azam Mihir Thatte, Rotterdam, NY (US);
James Albert Stares, Norton, MA (US);
Henry William Boger, Foxboro, MA (US);
Dresser, Inc., Addison, TX (US);
Abstract
An apparatus includes a cage and a main plug disposed in the cage. The main plug is movable between a main plug closed position and a main plug open position. A seal assembly disposed on the main plug, the seal assembly having a seal that is configured to contact the cage when the main plug is in the main plug closed position, and configured to reduce contact with the cage when a pressure differential across the seal is reduced. The apparatus includes a pressure balancing assembly movable between a closed position, an overtravel position and an open position. The pressure balancing assembly is configured to balance the pressure differential across the seal when in the overtravel and open position.