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:
Aug. 21, 2018
Filed:
Oct. 03, 2017
Applicant:
National Coupling Company, Inc., Stafford, TX (US);
Inventors:
Robert E. Smith, III, Missouri City, TX (US);
Timothy Goggans, Cypress, TX (US);
Frank Harold Hollister, Sugar Land, TX (US);
Assignee:
National Coupling Company, Stafford, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 33/038 (2006.01); E21B 33/064 (2006.01); E21B 34/04 (2006.01); E21B 34/16 (2006.01); F16K 15/02 (2006.01); F16K 27/02 (2006.01);
U.S. Cl.
CPC ...
F16K 27/0209 (2013.01); E21B 33/038 (2013.01); E21B 33/064 (2013.01); E21B 34/04 (2013.01); E21B 34/16 (2013.01); F16K 15/026 (2013.01);
Abstract
A subsea hydraulic system comprises a dual (or dual action) check valve on a port for connection to a remotely operated vehicle (ROV). The check valve provides backpressure to flow in either direction. This keeps hydraulic fluid in the hydraulic system, and seawater out. If flow needs to return to the ROV, it may flow out the port, subject to a selected back pressure.