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:
Apr. 19, 2016
Filed:
Oct. 24, 2013
Xiaoqi Bao, San Gabriel, CA (US);
Stewart Sherrit, La Crescenta, CA (US);
Mircea Badescu, La Canada Flintridge, CA (US);
Yoseph Bar-cohen, Seal Beach, CA (US);
Jeffery L. Hall, South Pasadena, CA (US);
Xiaoqi Bao, San Gabriel, CA (US);
Stewart Sherrit, La Crescenta, CA (US);
Mircea Badescu, La Canada Flintridge, CA (US);
Yoseph Bar-Cohen, Seal Beach, CA (US);
Jeffery L. Hall, South Pasadena, CA (US);
CALIFORNIA INSTITUTE OF TECHNOLOGY, Pasadena, CA (US);
Abstract
A hydraulic valve controller that uses an existing pressure differential as some or all of the power source for valve operation. In a high pressure environment, such as downhole in an oil or gas well, the pressure differential between the inside of a pipe and the outside of the pipe may be adequately large to drive a linear slide valve. The valve is operated hydraulically by a piston in a bore. When a higher pressure is applied to one end of the bore and a lower pressure to the other end, the piston moves in response to the pressure differential and drives a valve attached to it. If the pressure differential is too small to drive the piston at a sufficiently high speed, a pump is provided to generate a larger pressure differential to be applied. The apparatus is conveniently constructed using multiport valves, which can be rotary valves.