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. 16, 2013
Filed:
Dec. 09, 2002
Hideki Tsuchiya, Tokyo, JP;
Yoshiharu Miya, Tokyo, JP;
Hideki Tsuchiya, Tokyo, JP;
Yoshiharu Miya, Tokyo, JP;
Kayaba Industry Co., Ltd., Tokyo, JP;
Abstract
An electromagnetic proportional flow rate control valve capable of performing precise flow rate control in a low flow rate side of an operating region is provided. In an electromagnetic proportional flow rate control valve, in which a valve memberis driven in a valve closing direction in accordance with the increase in a driving current I of a solenoid coil, a solenoid driving force F is set such that it decreases accompanying the displacement of the valve memberin the valve closing direction with respect to an identical driving current in the solenoid coil. Thus, an amount of change in an area of a valve opening with respect to unit changes in the driving current I becomes smaller in a region at which the stroke is small compared to a case of having flat characteristics, whereby the flow rate control precision in the low flow rate region can be improved.