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. 29, 1997
Filed:
Nov. 30, 1994
Russell K Riggle, Newcomerstown, OH (US);
Walbro Corporation, Cass City, MI (US);
Abstract
A combination check and vent valve assembly for an automotive engine fuel system. The valve assembly has a fuel passage through a housing with an inlet communicating with a fuel pump outlet and an outlet to supply fuel to the engine. A check valve is disposed within the fuel passage which is normally closed when the fuel pump is not operating, and will open when the inlet fuel pressure exceeds the outlet fuel pressure. A normally closed vent valve is disposed within the fuel passage upstream of the check valve and serves as a moveable seat for the check valve, which will open when the valve assembly outlet fuel pressure is greater by a predetermined value than the fuel pump outlet pressure to bleed fuel through the passage and to the pump to reduce the outlet fuel pressure to a predetermined minimum pressure.