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:
Apr. 21, 1998
Filed:
Jun. 06, 1995
Yoneo Murai, Gamo-gun, JP;
Masaharu Fukuchi, Kanzaki-gun, JP;
Okumura Engineering Corp., Shiga, JP;
Abstract
A butterfly valve comprised of main body, a seating ring installed in the seating ring, and a disk shape valve member rotatably provided in the seating ring. The seating ring has an inside projecting ridge so that circumferential edges of vanes of the valve member come into contact with the side edges of the projecting ridge when the valve member is closed. The outer circumferential surface of the valve member is formed spherically as a whole so that machinery cutting of the surfaces of the valve member can easily be accomplished by a lathe. The seating ring has shaft supporting portions formed in concave surfaces so as to conform to the spherical surface of the valve member. Two vanes of the valve member are located at point-symmetrical positions with respect to shaft receptacles which are provided on the axis line of the valve member and extended tangentially with respect to the shaft receptacles. Thus, chamfering on the circumferential edges of the vanes can easily be accomplished by machinery, and the circumferential edges are rounded by chamfering so as to prevent damages on the seating ring.