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US 11,754,028 B2Granted
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.
Claims17
A fuel system, comprising:
- a diaphragm valve coupled to a fuel line between a fuel pump and a fuel rail, the fuel pump and the diaphragm valve positioned within a fuel tank, wherein the diaphragm valve including a diaphragm movable within a chamber of the diaphragm valve via a spring,
- wherein the diaphragm valve is configured to open when the fuel pump exceeds a predetermined pressure above a pressure of the fuel tank such that a fuel from the fuel pump flows to the fuel rail through the diaphragm valve,
- wherein the diaphragm valve is further configured to close when the fuel pump is deactivated, and
- wherein the opening of the diaphragm valve includes the spring being at least partly compressed and the diaphragm receded from a seal establishing fluidic communication between an inlet port and an outlet port.
1 more element
A method for a fuel system, comprising:
- preventing, via a spring and a diaphragm 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 diaphragm 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;
- upon opening of the diaphragm valve, flowing a fuel from a fuel pump to a fuel rail through the diaphragm valve;
- and
- closing the diaphragm valve via deactivating the fuel pump;
- wherein the opening of the diaphragm valve includes the spring being at least partly compressed and the diaphragm receded from a seal establishing fluidic communication between an inlet port and an outlet port.
4 more elements
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,
- wherein the diaphragm valve is configured such that a fuel from the fuel pump flows to the fuel rail through the diaphragm valve,
- wherein the diaphragm valve is further configured to close when the fuel pump is deactivated, and
- wherein the opening of the diaphragm valve includes the spring being at least partly compressed and the diaphragm receded from a seal establishing fluidic communication between an inlet port and an outlet port.
5 more elements
Dependencies are inferred from the claim text.