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. 24, 2012
Filed:
Mar. 13, 2008
Yohei Sawada, Osaka, JP;
Kaoru Hirata, Osaka, JP;
Ryosuke Dohi, Osaka, JP;
Kouji Nishino, Osaka, JP;
Nobukazu Ikeda, Osaka, JP;
Yohei Sawada, Osaka, JP;
Kaoru Hirata, Osaka, JP;
Ryosuke Dohi, Osaka, JP;
Kouji Nishino, Osaka, JP;
Nobukazu Ikeda, Osaka, JP;
Fujikin Incorporated, Osaka, JP;
Abstract
Stable flow control is made possible even under high-temperature environments by relieving tensional force applied to a piezoelectric element when a piezoelectric actuator is retracted. Thus, a piezoelectric driven control valve includes: a body having a valve seat; a metal diaphragm to contact with and separate from the valve seat; an actuator box supported ascendably and descendably on the body; a split base fixed to the body; a disc spring pressing and urging the actuator box downward to bring the metal diaphragm into contact with the valve seat; and a piezoelectric actuator housed inside the actuator box and that extends upward with application of voltage to press the actuator box upward against the elastic force of the disc spring, and a precompression mechanism, for applying a compression force constantly to piezoelectric elements in the piezoelectric actuator, provided between the split base and the piezoelectric actuator.