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:
Feb. 01, 2000
Filed:
Jul. 10, 1997
Leon P Janik, Suffield, CT (US);
Michael J Williams, Glastonbury, CT (US);
Larry R Cote, Coventry, CT (US);
Stanadyne Automotive Corp., Windsor, CT (US);
Abstract
A fuel filter assembly employs a hand primer and a disposable filter cartridge mounted to a header. The filter cartridge has a filter element which defines an interior chamber for receiving the filtered fuel. The hand primer includes a diaphragm which cooperates with the header to define a reservoir and a valve plate having a plurality of orifices and an axial opening for providing fluid communication between an exit passage of the header and the reservoir and between the chamber and the reservoir, respectively. A first check valve is mounted in the opening and a second check valve is mounted in an axial bore in the first check valve. The first and second check valves are moveable between an open position for allowing flow through the orifices of the valve plate and orifices in the first check valve, respectively, and a closed position for preventing such flow. The filter assembly is primed by pushing the diaphragm downwards, creating a high pressure which moves the first check valve to the open position and the second check valve to the closed position, causing trapped air to be expelled through the orifices and the exit passage. Removing the downwards force allows a spring to return to bias the diaphragm upwards, creating a low pressure which moves the first check valve to the closed position and the second check valve to the open position, and drawing fuel from the interior chamber.