Flow-actuated trapped-pressure unloader valve
First Claim
1. An unloader valve operable to direct a flow of fluid, the valve comprising:
- a housing having a bypass opening, an inlet opening, an outlet opening and an internal chamber between the inlet opening and the outlet opening;
a shuttle valve disposed within the internal chamber, the shuttle valve movable between a first position wherein the flow of fluid is substantially directed to the bypass opening and a second position wherein the flow of fluid is directed to the outlet opening, the shuttle valve including an internal flow path having a venturi therein; and
a biasing member biasing the shuttle valve in the first position.
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Accused Products
Abstract
The invention recites an unloader valve operable to direct a flow of fluid. The valve includes a housing having a bypass opening, an inlet opening, an outlet opening and an internal chamber between the inlet opening and the outlet opening. A shuttle valve is disposed within the internal chamber and is movable between a first position wherein the flow of fluid is substantially directed to the bypass opening and a second position wherein the flow of fluid is directed to the outlet opening. The shuttle valve includes an internal flow path having a venturi therein. A biasing member biases the shuttle valve in the first position.
30 Citations
22 Claims
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1. An unloader valve operable to direct a flow of fluid, the valve comprising:
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a housing having a bypass opening, an inlet opening, an outlet opening and an internal chamber between the inlet opening and the outlet opening;
a shuttle valve disposed within the internal chamber, the shuttle valve movable between a first position wherein the flow of fluid is substantially directed to the bypass opening and a second position wherein the flow of fluid is directed to the outlet opening, the shuttle valve including an internal flow path having a venturi therein; and
a biasing member biasing the shuttle valve in the first position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pressure washer comprising:
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a frame;
a control member movable between a first position and a second position;
a pump supported by the frame, the pump having an inlet and an outlet, the pump operable to draw in a low-pressure flow at the inlet and discharge a high-pressure flow to the pump outlet; and
an unloader valve including a housing, a shuttle valve, and a biasing member, the housing having a bypass opening, an inlet opening, an outlet opening and an internal chamber between the inlet opening and the outlet opening, the shuttle valve disposed within the internal chamber and movable in response to the control member between a first position wherein the high-pressure flow is substantially directed to the bypass opening and a second position wherein the high-pressure flow is directed to the outlet opening, the shuttle valve including an internal flow path having a venturi therein, the biasing member biasing the shuttle valve in the first position. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An unloader valve operable in response to a pressure change to direct a flow of fluid, the unloader valve comprising:
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a housing including a first inlet, a first outlet, and a second outlet, the housing defining an internal chamber between the first inlet and the first outlet;
a shuttle valve including a first internal flow path and a second internal flow path, the shuttle valve moveable between a first position and a second position in response to the pressure change, the shuttle valve cooperating with the housing to define a first outer flow path when in the first position and a second outer flow path when in the second position, such that the flow of fluid is directed from the first inlet to the second outlet via the first internal flow path and the first external flow path when the shuttle valve is in the first position and the flow of fluid is directed from the first inlet to the first outlet via the first internal flow path, the second external flow path, and the second internal flow path when the shuttle valve is in the second position; and
a biasing member biasing the shuttle valve in the first position. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification