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, 2004
Filed:
Jan. 30, 2003
Charles L. DePenning, Nevada, IA (US);
Donald G. Ralston, Conrad, IA (US);
Hans D. Baumann, Rye, NH (US);
Fisher Controls International, Inc., Marshalltown, IA (US);
Abstract
A valve having improved inherent flow characteristics and improved dynamic torque characteristics is provided. The valve includes a disk for controlling fluid flow inside the valve. The disk has at least a sealing surface for sealing with a valve seal when the disk is in a closed position. The sealing surface includes a contour and creates a flow clearance with the valve seal as the disk pivots from a closed position toward an open position. A radius of curvature of the contour defines a size of the flow clearance at predetermined disk positions to characterize flow through the valve. The valve can further include an upstream indentation for dynamic torque reduction and/or an indentation for dynamic torque reduction in case of a fluid flow reversal.