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:
Mar. 02, 1993
Filed:
Oct. 07, 1991
Russell A Johnston, Alvin, TX (US);
Camco International Inc., Houston, TX (US);
Abstract
An injection valve for use in a well having a valve closure element positioned below a valve seat moving between an open position to a closed position on the valve seat for blocking off upward flow through the bore, but allowing downward flow. A flow tube is telescopically movable in the housing for controlling the movement of the valve closure member and a piston is movable in the housing and connected to the flow tube and exposed to fluid in the bore. An upwardly facing shoulder on the flow tube receives a retrievable orifice member for providing a force for fully opening the valve when fluid is injected downwardly through the bore. A retrievable lockout sleeve is provided to lock the valve open when the retrievable orifice is removed.