Fuel filter with hand primer
US6019890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1997 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Jul 10, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M37/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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 ret…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.