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:
Dec. 10, 1991
Filed:
Mar. 13, 1991
Elmer S Welch, Silver Lake, WI (US);
V.Q. Corp., Silver Lake, WI (US);
Abstract
In a flow controller, a housing structure connectable in a process line is adapted to receive a process fluid from an upstream pump and to discharge the process fluid to a downstream device. A flow restrictor mounted in the housing structure is movable between an operative position wherein the flow restrictor coacts with the housing structure to define a restricted orifice and an inoperative position. A piston movable within a hydraulic cylinder is connected, via a shaft, to the flow restrictor. A valve controlled by a timer admits a hydraulic fluid, preferably water, into the hydraulic cylinder to move the piston, so as to move the flow restrictor to the operative position and hold it, and permits the hydraulic fluid to drain after a timed interval sufficient to permit the process fluid to fill the process line between the flow controller and the downstream device.