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. 21, 1982
Filed:
Jul. 25, 1980
J David Eller, Deerfield Beach, FL (US);
Other;
Abstract
The present hydraulic system for driving a submersible pumping unit has an above-ground pump for pumping oil through a hydraulic motor in the submersible pumping unit which has a gate valve to prevent the reverse flow of water after the submersible pumping unit is turned off. A pressure regulating valve limits the oil pressure to the hydraulic motor. The inlet flow to the above-ground pump is filtered. In the present improvement, the hydraulic surge at start-up and shut-down is cushioned by bypassing hydraulic fluid through an accumulator which causes pressure at the motor in the submersible pumping unit to build-up relatively gradually at start-up and decrease relatively gradually at shut-down.