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. 20, 1993
Filed:
Apr. 23, 1992
Lee A Naffziger, Sterling, IL (US);
Borg-Warner Automotive Electronic & Mechanical Systems Corporation, Sterling Heights, MI (US);
Abstract
A composite check valve and positively closing valve, particularly such a valve for regulating the introduction of secondary air into the exhaust stream of an internal combustion engine at selected times during the operation of the engine. The valve comprises an inlet port, an outlet port, a first valve element movable between open and closed positions for nominally regulating the flow of a fluid between the inlet and outlet ports, and a second valve element for overriding the first element. The second element can function by seating against the same seat as the first element, or by 'latching' the first element in its closed position. The disclosed embodiment is a flap valve which is modified by superimposing a rigid, movable valve disk over the flap. The rigid disk is movable between a disengaged position where it may have no immediate function and an override position urging the flap against its seat or otherwise closing the aperture defined by the seat. The rigid disk may also limit the opening of the flap to regulate the rate of fluid flow through the valve.