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:
Feb. 15, 1983
Filed:
Jul. 28, 1980
William Yelich, Costa Mesa, CA (US);
Cla-Val Co., Newport Beach, CA (US);
Abstract
A radially inner portion of a flat annular elastomeric washer is inserted and retained in a frustoconical annular groove formed in a cylindrical valve seat of an inline disc check valve. The groove is positioned and dimensioned so that it grips the washer and holds it in a radially stretched, axially skewed configuration wherein one of the washer's outer peripheral corner edges forms a leading sealing edge of the valve seat. At low back pressures in the valve, a line seal is formed between the leading washer edge and the valve's closure disc. High back pressures cause the disc to rearwardly deflect the protruding radially outer portion of the washer and engage the valve seat itself. Because the installed washer is both radially stretched and axially skewed, forward flow through the valve does not tend to dislodge the washer, and reverse flow around the washer portion within the groove is prevented.