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US 2022/0412298 A1Published application
Fuel system diaphragm valve
AssigneeFord Global Technologies, LLC
InventorsSteven Antone Thiel, Ross Pursifull, Christopher Woodring
Life of this patent
Estimating the term…
Abstract
A fuel line check valve system and a fuel system that includes the fuel line diaphragm valve system are described. The fuel line diaphragm valve system may prevent flow into a fuel system that is generated via a vacuum in the fuel system. The fuel line diaphragm valve may also remain in an open state after it is open via a reduced pressure.
Claims20
A fuel system, comprising:
- a diaphragm valve coupled to a fuel line between a fuel pump and a fuel rail, the diaphragm valve including a diaphragm movable within a chamber of the diaphragm valve via a spring.
A method for a fuel system, comprising:
- preventing, via a spring and a diagram of a diaphragm valve, opening of the diaphragm valve coupled to a fuel line while a fuel pressure difference across the diaphragm valve is less than a first fuel pressure difference;
- and
- reducing, via the spring and the diagram of the diaphragm valve, the fuel pressure difference across the diaphragm valve to less than a second fuel pressure difference after the diaphragm valve begins to open, the second fuel pressure difference lower than the first fuel pressure difference.
A fuel system, comprising:
- a fuel pump;
- a diaphragm valve arranged in a fuel line downstream of a fuel filter;
- and
- a fuel rail arranged in the fuel line downstream of the diaphragm valve, the diaphragm valve comprising:
- a housing including a working cavity having a first area and a spring cavity having a second area separated via a diaphragm, and a spring coupled to the diaphragm.
2 more elements
Dependencies are inferred from the claim text.