Valve arrangement for a fuel system
AssigneeROLLS-ROYCE plc
InventorMichael R. Smith
Life of this patent
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Abstract
The disclosure relates to a valve for a fuel system having a body with at least one inlet and one outlet, the inlet fluidly connected to a pressurised fuel source in use. A shuttle is mounted within the body, the shuttle having a cavity of fixed volume and movable between a first position where fluid is permitted to flow through the inlet and is prevented from flowing through the outlet and a second position where fluid is prevented from flowing through the inlet and is permitted to flow through the outlet. A piston is configured to engage the fluid within the shuttle cavity to move the shuttle between the first and second position. A biasing mechanism biases the shuttle towards the first position and where the shuttle moves towards the second position when the fluid within the shuttle reaches a critical pressure.
Claims19
A valve for a fuel delivery system, comprising:
- a valve body comprising an internal cavity, at least one inlet and one outlet, the inlet fluidly connected to a fuel source in use;
- a shuttle mounted within the body, the shuttle comprising a partition spanning the internal cavity and moveable relative to the inlet and outlet between a first position where the shuttle blocks the outlet whilst fluid is permitted to flow through the inlet and a second position whereby the outlet is opened whilst fluid is prevented from flowing through the inlet;
- a piston configured to engage the fluid within the internal cavity in order to move the shuttle between the first and second position;
- and
- a biasing mechanism arranged to bias the shuttle towards the first position;
- wherein the shuttle is moved towards the second position when the fluid within the cavity reaches a threshold pressure, and
- wherein the shuttle comprises the partition and a side wall having an open end so as to define an internal volume within the shuttle, wherein the internal volume defines a predetermined metered volume of fuel and the piston extends into the internal volume of the shuttle to expel the fluid therein when the shuttle is in the second position.
A valve for a fuel delivery system, comprising:
- a valve body comprising an internal cavity, at least one inlet and one outlet, the inlet fluidly connected to a fuel source in use;
- a shuttle mounted within the body, the shuttle comprising a partition spanning the internal cavity and moveable relative to the inlet and outlet between a first position where the shuttle blocks the outlet whilst fluid is permitted to flow through the inlet and a second position whereby the outlet is opened whilst fluid is prevented from flowing through the inlet;
- a piston configured to engage the fluid within the internal cavity in order to move the shuttle between the first and second position;
- and
- a biasing mechanism arranged to bias the shuttle towards the first position;
- wherein the shuttle is moved towards the second position when the fluid within the cavity reaches a threshold pressure, and
- wherein the valve housing and shuttle comprise a first valve housing and a first shuttle, the valve comprising a further valve housing and a further shuttle sharing a common piston with the first valve housing and the first shuttle, and configured such that when the first shuttle is in the first position, the further shuttle is in the second position.
Dependencies are inferred from the claim text.