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:
May. 30, 1989
Filed:
Apr. 11, 1988
James B Renfroe, Jr, Valencia, CA (US);
Otis Engineering Corporation, Dallas, TX (US);
Abstract
A sleeve type valve useful in a well tubing string for controlling flow between the valve interior and exterior. An internal pressure balanced sleeve is releasably positioned to the valve body closing a flow port in the valve body wall to flow. The valve has an external pressure unbalanced sleeve also releasably positioned to close the port to flow. When the internal sleeve is moved to a position opening the port to flow, pressure may be increased in the valve interior to act through the port on the unbalanced sleeve, moving this sleeve to a position also opening the port to flow and permitting flow between the valve interior and exterior. The body has profiled grooving and a seal bore above the port and a seal bore below the port in which a locking mandrel may lock and seal, reclosing the port to flow.