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:
Nov. 11, 2003
Filed:
May. 10, 2002
Shiang-Fu Chen, Hsinchu Hsien, TW;
Chien-An Chen, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A unidirectional-retroaction electromagnetic valve comprises a valve body, O-ring, manual opening unit, and electrically controlled blocking unit. The valve body is connected to a gas source directly and the electrically controlled blocking unit is used to stop gas in a dangerous situation. Two actions are required to open the electromagnetic valve when the dangerous situation no longer exists. First, push the manual opening unit to move the valve plate of the electromagnetic valve forward a certain distance, then the electrically controlled blocking unit moves the valve plate further according to a danger removal signal provided by a judgment device. The electromagnetic valve is not opened completely until these two movements are operated, thereby, it can prevent the blocked valve from opening intentionally during an unsafe situation.