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:
Jul. 12, 2005
Filed:
Feb. 06, 2003
Isao Suzuki, Tokyo, JP;
Isao Suzuki, Tokyo, JP;
MKS Japan Inc., Tokyo, JP;
Abstract
An electromagnetic valve for opening and closing a fluid flow passage by operating a plunger under a magnetic force of a solenoid. The valve comprises a valve head provided at one of opposite ends of the plunger, and a fixed valve seat including an orifice providing a fluid flow passage. The valve head is adapted to abut against the valve seat to close the orifice. A spring resiliently presses the valve head in a direction for abutment of the valve head against the valve seat to close the orifice. Either one of the valve head and the valve seat is formed from a metallic material and the other is formed from a non-metallic material having a greater hardness than the metallic material. It is preferred that the metallic material be a highly corrosion-resistant metal alloy containing Ni in a high amount ratio, and the non-metallic material be of a ceramic type.