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:
Nov. 10, 1992
Filed:
May. 11, 1990
Robert R Fiedler, Lincoln, NE (US);
Isco, Inc., Lincoln, NE (US);
Abstract
To provide smoother operation of a gas-operated purge pump, the pump housing receives a standpipe closed by a low-density, floatable check valve element at the inlet of a standpipe within the housing. Periodically, at timed intervals, air is forced through an air conduit into the housing. If there is liquid in the housing, a check valve element floats upwardly because it is less dense than the liquid and mounted for movement to and away from the valve seat. While it is off of the valve seat, the air forces water into the standpipe and it moves upwardly until the chamber of the tubular pump housing is free of the liquid, at which time the check valve drops back into position and seats to prevent further flow of liquid. Upon termination of the pumping of gas pressure, the check valve in the pump housing inlet is free to move under the pressure of water in the well and the pump housing chamber again fills with fluid, causing the valve element to lift and permitting flow of water into the standpipe.