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:
Aug. 15, 2023
Filed:
Mar. 19, 2019
Ntn Corporation, Osaka, JP;
Kohzoh Kakehi, Mie, JP;
Yuuki Yamazoe, Mie, JP;
NTN CORPORATION, Osaka, JP;
Abstract
To provide a seal ring capable of suppressing wear of a mating housing and preventing protrusion from an annular groove and thereby being superior in low leak performance, which is an original object of the seal ring. A seal ringformed of resin is attached to an annular grooveformed on an outer periphery of a butterfly valvehaving a substantially disc shape so as to seal an annular gapbetween the butterfly valveand a housingin which the valve is housed. A part of the seal ringis protruded from the annular groove, so that the seal ringadheres to the housingto seal the annular gapdue to pressure from sealed fluid. A radial direction thickness t of the ring is set in a range of 7-11% of a ring outer diameter in a free state. A ring inner diameter in a state in which the diameter is enlarged due to pressure from the sealed fluid when the valve is opened, is smaller than an outer diameter r of the valve.