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:
May. 24, 2022
Filed:
Jan. 08, 2021
Applicant:
Ckd Corporation, Komaki, JP;
Inventor:
Yasunori Nishimura, Komaki, JP;
Assignee:
CKD CORPORATION, Komaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 1/226 (2006.01); F16K 51/02 (2006.01);
U.S. Cl.
CPC ...
F16K 1/2265 (2013.01); F16K 51/02 (2013.01);
Abstract
A butterfly valve includes a drive unit and a valve unit that are coupled to each other. The drive unit includes a hollow part in which a rod is inserted between a DD motor and an end portion of the drive unit on a coupling side to the valve unit. In the hollow part, a cylindrical magnetic member is placed coaxially with the rod to cover the outer peripheral surface of the rod. A magnetic fluid is filled in a void between the outer peripheral surface of the magnetic member and the inner peripheral surface of the hollow part. The rod is made of a non-magnetic corrosion-resistant alloy.