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:
Mar. 17, 2026
Filed:
Sep. 04, 2024
Ckd Corporation, Komaki, JP;
Kyouta Nakayama, Komaki, JP;
Tetsujiro Kono, New Taipei City, TW;
CKD CORPORATION, Komaki, JP;
Abstract
A vacuum open-close valve includes a drive unit for driving a valve element based on an opening-degree command value. The drive unit includes a drive shaft connected to the valve element, a piston connected to the drive shaft at an opposite end from the valve element, a cylinder provided with a piston chamber housing the piston, and a bellofram that is retained by the piston and partitions the piston chamber. A controller is provided with an abnormality detection program configured to calculate an opening-degree difference between an opening-degree command value outputted to the vacuum open-close valve and an actual opening degree of the valve element driven by the opening-degree command value, and determine that the bellofram is damaged when the opening-degree difference is a first predetermined threshold value or more.