Control element and check valve assembly
First Claim
1. A valve arrangement, comprising:
- a housing defininga first port for connection to an external fluid circuit;
a second port for connection to the external fluid circuit; and
a first fluid passageway providing fluid communication between the first port and the second port;
a second fluid passageway providing fluid communication with the first port;
a control element disposed in the housing and positioned by a balance of forces acting thereon, the control element being positionable to one or more throttled positions for controlling fluid flow through the first fluid passageway from the first port to the second port, the control element being positionable to a fully open position to permit relatively unrestricted fluid flow through the first fluid passageway from the second port to the first port; and
a check valve disposed in the second fluid passageway for preventing fluid flow through the second fluid passageway from the first port when fluid pressure in the first port is greater than fluid pressure in the second port, and permitting fluid flow through the second fluid passageway to the first port when fluid pressure in the first port is less than the fluid pressure in the second port thereby affecting the balance of forces acting on the control element such that the control element is urged toward the fully open position.
2 Assignments
0 Petitions
Accused Products
Abstract
An arrangement includes a housing defining a first and second ports. A first passageway provides communication between the ports; a second passageway provides communication with the first port. An element is disposed in the housing and positioned by a balance of forces, the element is positionable to throttled positions for controlling flow through the first passageway in a first direction and to an open position to permit unrestricted flow in a second direction. A check valve is disposed in the second passageway for preventing flow therein from the first port when pressure in the first port is greater than pressure in the second port, and permitting flow through the second passageway to the first port when pressure in the first port is less than the pressure in the second port thereby affecting the balance of forces acting on the element so the element is urged toward the fully open position.
211 Citations
19 Claims
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1. A valve arrangement, comprising:
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a housing defining a first port for connection to an external fluid circuit; a second port for connection to the external fluid circuit; and a first fluid passageway providing fluid communication between the first port and the second port; a second fluid passageway providing fluid communication with the first port; a control element disposed in the housing and positioned by a balance of forces acting thereon, the control element being positionable to one or more throttled positions for controlling fluid flow through the first fluid passageway from the first port to the second port, the control element being positionable to a fully open position to permit relatively unrestricted fluid flow through the first fluid passageway from the second port to the first port; and a check valve disposed in the second fluid passageway for preventing fluid flow through the second fluid passageway from the first port when fluid pressure in the first port is greater than fluid pressure in the second port, and permitting fluid flow through the second fluid passageway to the first port when fluid pressure in the first port is less than the fluid pressure in the second port thereby affecting the balance of forces acting on the control element such that the control element is urged toward the fully open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A valve arrangement, comprising:
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a housing defining a first port and a second port; a check valve which shuts when fluid pressure is greater in the first port than the second port, and which opens when fluid pressure is greater in the second port than the first port; and an expansion valve for throttling the flow of a refrigerant fluid from the first port to the second port when electrically energized and fluid pressure is greater in the first port than the second port, the expansion valve operating under a balance of forces which cause the expansion valve to move to a closed position when electrically deenergized and fluid pressure is greater in the second port than the first port but for the operation of the check valve, which check valve, when open, causes a balance of forces that cause the expansion valve to move to an open position when electrically deenergized and fluid pressure is greater in the second port than the first port, permitting fluid flow through the expansion valve from the second port to the first port. - View Dependent Claims (16, 17, 18)
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19. An apparatus, comprising:
- a refrigerant expansion valve, including a housing defining a first port;
a second port; and
a first fluid passageway providing refrigerant fluid communication between the first port and the second port; and
a control element disposed in the first passageway, the control element being positionable to one or more throttled positions for controlling fluid flow through the first passageway from the first port to the second port, the control element being positionable to a fully open position to allow a maximum flow rate of refrigerant fluid through the first passageway from the second port to the first port; and
a check valve disposed in a second fluid passageway providing refrigerant fluid communication between the second port and the first port, the check valve preventing refrigerant fluid flow through the second passageway from the first port to the second port, the check valve permitting a second flow rate of refrigerant fluid from the second port to the first port through the second passageway thereby affecting a balance of forces acting on the control element such that the control element is urged toward the fully open position, the maximum flow rate being greater than the second flow rate.
- a refrigerant expansion valve, including a housing defining a first port;
Specification