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:
Oct. 05, 1999
Filed:
Sep. 12, 1997
Norbert J Kot, Brookfield, WI (US);
NGT, LLC., Elm Grove, WI (US);
Abstract
A valve assembly includes a check valve element in the output chamber. The check valve element opens to permit forward flow of fluid under pressure in the output chamber from a source toward a load. The check valve element closes to block back flow of fluid under pressure in the output chamber from the load toward the source. The back flow of fluid under pressure exerts a closing force upon the check valve element from within the output chamber. A counter force generating element is located within the output chamber and coupled to the valve element. The counter force generating element applies a counter force to the check valve element, which urges the valve element toward the opened condition. The counter force is, by purpose, less than the closing force, so the check valve element remains closed. Nevertheless, the presence of the counter force reduces the overall sealing forces applied by check valve element, thereby reducing the magnitude of force which is ultimately required to unseat the check valve element.