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:
Oct. 20, 2015
Filed:
Mar. 27, 2012
Applicant:
Age Kyllingstad, Algard, NO;
Inventor:
Age Kyllingstad, Algard, NO;
Assignee:
NATIONAL OILWELL VARCO NORWAY AS, Stavanger, NO;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16K 17/14 (2006.01); F16K 17/40 (2006.01); E21B 21/10 (2006.01);
U.S. Cl.
CPC ...
F16K 13/04 (2013.01); E21B 21/106 (2013.01); Y10T 137/0379 (2015.04); Y10T 137/1692 (2015.04);
Abstract
A device for preventing a primary relief valve in a mud system from opening at a pressure lower than a nominal opening pressure includes a flow restrictor between a mud pump of the mud system and the primary relief valve. In addition, the device includes a cavity between the flow restrictor and the primary relief valve.