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. 05, 2002
Filed:
Sep. 21, 2001
Philip Andrew Simmons, Alcester, GB;
Martin Stanley Johnson, Bishops Itchington, GB;
IMI Cornelius Inc., Anoka, MN (US);
Abstract
The present invention is a flow rate control valve through which a liquid flows and from which the liquid is dispensed. The flow rate of the liquid is sensed and that information is sent to a microprocessor based control. The control operates a drive of the control valve so as to vary the resultant rate at which the liquid is dispensed therefrom. The drive operates a piston closure member that extends closely within a cylindrical passageway. The passageway has an inlet end and an outlet end and the drive operates the closure member in the passageway to a plurality of positions from a first position at the inlet end and a second position at the outlet end. The wall of the passageway defines at least one groove having a transverse cross-section that increases in area in a downstream direction from the passageway inlet to the passageway outlet or in an upstream direction from the passageway outlet to the passageway inlet, whereby movement of the closure between the first position and the second position varies the flow rate of the liquid through the control valve as a function of the cross-sectional area of the groove.