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:
Sep. 01, 1992
Filed:
Aug. 23, 1991
Dwight Baker, Rush Springs, OK (US);
James C Baker, Rush Springs, OK (US);
Randall King, Duncan, OK (US);
Elton W Eads, Ninnekah, OK (US);
Other;
Abstract
A gate lifter for shifting a gate from a valve seat in a gate valve. The gate lifter is provided on the downstream, or low pressure side of a valve, and is a tubular structure that surrounds and is slidable relative to a tubular valve seat. Hydraulic or other pressurized fluid is adapted to be introduced between an end of the lifter and a flange carried by the valve seat to cause the parts to move in opposite directions, as a result of which the lifter operates by shifting the gate member away from the valve seat to avoid damage to the valve seat as the gate member is moved there across. The gate lifter includes a face that is adapted to engage with a corresponding face of the gate member, the gate lifter face preferably including a low friction coating, such as teflon, gearings or gearing type material.