Combined metering valve and pressure regulating valve
First Claim
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1. A valve combining a metering function and a pressure regulating function comprising:
- a valve housing to house a metering valve, said metering valve being movable by a control to meter an amount of fluid delivered from an inlet to an outlet;
a pressure regulating valve being moveable relative to said metering valve, said pressure regulating valve being received within the valve housing and being supplied with a pressure delivered into said inlet on a first face, and a pressure downstream of said outlet on a second face, and said pressure regulating valve acting to regulate a pressure difference between the inlet and outlet;
said control including an electronic control for selectively moving the metering valve;
said electronic control controlling a difference in pressure of fluid at opposed sides of said metering valve;
said pressure regulating valve being slidable along a portion of said metering valve, such that said pressure regulating valve and said metering valve move along coaxial axes;
wherein said metering valve has a first enlarged land which meters the flow of a fluid from the inlet through the outlet; and
wherein said pressure regulating valve controls an amount of fluid that is delivered from the inlet to a second outlet leading to a bypass line.
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Abstract
A valve element combines a metering function and a pressure regulating function. A valve housing houses a metering valve. The metering valve is movable by a control to meter an amount of fluid delivered from an inlet to an outlet. A pressure regulating valve is received within the valve housing and is supplied with a pressure delivered into the inlet on a first face, and a pressure downstream of the outlet on a second face. The pressure regulating valve acts to regulate the pressure drop across the metering valve to ensure accurate fluid metering.
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Citations
6 Claims
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1. A valve combining a metering function and a pressure regulating function comprising:
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a valve housing to house a metering valve, said metering valve being movable by a control to meter an amount of fluid delivered from an inlet to an outlet; a pressure regulating valve being moveable relative to said metering valve, said pressure regulating valve being received within the valve housing and being supplied with a pressure delivered into said inlet on a first face, and a pressure downstream of said outlet on a second face, and said pressure regulating valve acting to regulate a pressure difference between the inlet and outlet; said control including an electronic control for selectively moving the metering valve; said electronic control controlling a difference in pressure of fluid at opposed sides of said metering valve; said pressure regulating valve being slidable along a portion of said metering valve, such that said pressure regulating valve and said metering valve move along coaxial axes; wherein said metering valve has a first enlarged land which meters the flow of a fluid from the inlet through the outlet; and wherein said pressure regulating valve controls an amount of fluid that is delivered from the inlet to a second outlet leading to a bypass line. - View Dependent Claims (2, 3, 4)
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5. A fuel supply system comprising:
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a pump for delivering fuel to an outlet, said outlet communicating with a valve housing, said valve housing including an inlet to deliver fluid from the pump into a valve chamber; a metering valve movable within said valve chamber, said metering valve being positioned by a control to move a land, said land metering the amount of fluid from said inlet passing through an outlet; a pressure regulating valve movable relative to said metering valve, and within said valve chamber, said pressure regulating valve controlling the amount of fluid passing from said inlet to a bypass outlet, and said pressure regulating valve being biased by a pressure downstream of said inlet in said valve chamber on a first face, and a pressure downstream of said outlet on an opposed face, with a spring further biasing said pressure regulating valve in combination with said downstream pressure; said control including an electronic control for selectively moving the metering valve; said electronic control controlling a difference in pressure of fluid at opposed sides of said metering valve; and said pressure regulating valve being slidable along a portion of said metering valve, such that said pressure regulating valve and said metering valve move along coaxial axes. - View Dependent Claims (6)
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Specification