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:
Jul. 24, 2012
Filed:
Mar. 22, 2011
Kirt Nathaniel Stephens, New Berlin, WI (US);
Kathryn Irene Bacon, Waukesha, WI (US);
Kirt Nathaniel Stephens, New Berlin, WI (US);
Kathryn Irene Bacon, Waukesha, WI (US);
Incova Technologies, Inc., Waukesha, WI (US);
Abstract
A valve arrangement includes a valve body with a bore within which a spool slides to control fluid flow between first and second ports. The bore has an annular recess into which the first port opens and in which is located a check valve band formed by a strip with overlapping ends. Pressure in the first port causes the check valve band to contract and expand circumferentially to open and close the first port. A stop is located near one end of the strip and is engaged by the other end to limit the amount of contraction of the check valve band. Thus the diameter of the check valve band cannot contract smaller than the diameter of the bore, thereby retaining the check valve ring in the annular recess. The check valve band optionally has a plurality of tabs projecting from each edge and engaging side walls of the annular recess.