A valve assembly is provided, the valve assembly comprising a valve housing; an inlet for fluid entering the valve housing; an outlet for fluid leaving the valve housing; a flow control assembly disposed within the valve housing between the inlet and the outlet, whereby fluid entering the valve hous
A valve assembly is provided, the valve assembly comprising a valve housing; an inlet for fluid entering the valve housing; an outlet for fluid leaving the valve housing; a flow control assembly disposed within the valve housing between the inlet and the outlet, whereby fluid entering the valve housing is caused to flow through the flow control assembly, the flow control assembly comprising a cage having apertures therethrough to provide passage for fluid passing from the inlet to the outlet; a closure assembly having a first closure member disposed within the cage and moveable with respect to the cage between a first closed position, in which the first closure member closes the innermost end of all of the apertures in the cage, and a second open position, in which the innermost end of all the apertures in the cage are open; and a second closure member disposed outside the cage and moveable with respect to the cage between a first closed position, in which the second closure member closes the outermost end of all of the apertures in the cage, and a second open position, in which the outermost end of all the apertures in the cage are open.
대표청구항▼
1. A valve assembly comprising: a valve housing having a wall that defines a cavity and a channel in the form of an involute, wherein the channel is recessed into a surface of the wall that defines the cavity;an inlet for fluid entering the valve housing;an outlet for fluid leaving the valve housing
1. A valve assembly comprising: a valve housing having a wall that defines a cavity and a channel in the form of an involute, wherein the channel is recessed into a surface of the wall that defines the cavity;an inlet for fluid entering the valve housing;an outlet for fluid leaving the valve housing;a flow control assembly disposed within the cavity of the valve housing between the inlet and the outlet, whereby fluid entering the valve housing is caused to flow through the flow control assembly, the flow control assembly comprising:a cage having apertures therethrough to provide passage for fluid passing from the inlet to the outlet;a closure assembly comprising: a first closure member disposed within the cage and moveable with respect to the cage between a first closed position, in which the first closure member closes an innermost end of all of the apertures in the cage, and a second open position, in which the innermost end of all the apertures in the cage are open; anda second closure member disposed outside the cage and moveable with respect to the cage between a first closed position, in which the second closure member closes the outermost end of all of the apertures in the cage, and a second open position, in which the outermost end of all the apertures in the cage are openwherein a cross-sectional width of the channel tapers from the inlet in a direction about a circumference of the wall, and wherein the channel is configured to gradually direct the fluid towards the flow control assembly. 2. The valve assembly according to claim 1, wherein all the fluid entering the valve housing through the inlet is caused to flow through the flow control assembly to the outlet. 3. The valve assembly according to claim 1, wherein the valve housing comprises the cavity therein, the flow control assembly being disposed within the cavity, such that the cavity extends around the flow control assembly. 4. The valve assembly according to claim 3, wherein the inlet extends at an angle to a radial direction within the cavity, such that fluid entering the cavity is not caused to impinge directly onto the flow control assembly. 5. The valve assembly according to claim 4, wherein the inlet is arranged in the valve housing to extend tangentially to the wall of the cavity, such that, in use, fluid is caused to enter the cavity along the circumferential wall of the cavity. 6. The valve assembly according to claim 5, wherein the cavity comprises the channel extending circumferentially its wall extending around the flow control assembly, in use the inlet directing an incoming fluid stream into the channel. 7. The valve assembly according to claim 6, wherein the channel has a form of an involute. 8. The valve assembly according to claim 7, wherein the channel has a progressively smaller cross-sectional area travelling in a direction of flow of fluid in the channel. 9. The valve assembly according to claim 1, wherein the apertures are arranged in the cage in a plurality of rows, each row containing at least one aperture, adjacent rows being separated by a land having no apertures therethrough. 10. The valve assembly according to claim 9, wherein the adjacent apertures in adjacent rows are offset circumferentially from one another around an exterior of the cage. 11. The valve assembly according to claim 10, wherein the adjacent apertures in adjacent rows extend in a helical pattern along and around the cage. 12. The valve assembly according to claim 1, wherein the apertures extend through the wall of the cage at an angle to a radial direction in a plane perpendicular to a longitudinal axis of the cage. 13. The valve assembly according to claim 12, wherein the apertures open tangentially to an interior surface of the cage. 14. The valve assembly according to claim 1, wherein the apertures extend at an angle to a plane perpendicular to a longitudinal axis, in a longitudinal direction of flow of fluid within the cage. 15. The valve assembly according to claim 14, wherein the apertures are angled such that, in use, a fluid jet entering the cage from one aperture does not contact the fluid jet entering the cage through an adjacent aperture in a direction of flow of fluid within the cage. 16. The valve assembly according to claim 1, wherein the first and second closure members are moveable together with respect to the cage, wherein the first and second closure members are connected together and are moveable by a single actuator assembly. 17. The valve assembly according to claim 16, wherein the first and second closure members both extend from a single support member, wherein the support member is a piston moveable longitudinally within a chamber. 18. The valve assembly according to claim 1, wherein the first and second closure members are of a different size, such that the number of apertures closed by the first closure member in a given position may be different to the number of apertures closed by the second closure member when in the given position. 19. The valve assembly according to claim 18, wherein as the first and second closure members are moved from the first, closed position, one of the first or second closure members opens apertures before the other of the first and second closure members. 20. The valve assembly according to claim 1, wherein the first closure member is longer in a longitudinal direction of the cage than the second closure member. 21. The valve assembly according to claim 1, wherein at least one of the first and second closure members is provided with a sealing surface to engage with a seat in the first closed position. 22. The valve assembly according to claim 21, wherein the seat is displaced from the apertures of the cage, such that in use the seat is outside a direct flow path of fluid passing through the apertures in the cage. 23. The valve assembly according to claim 21, wherein the seat is self-sharpening. 24. The valve assembly according to claim 21, wherein the seat is provided with a sealing surface extending at an acute angle to a longitudinal axis of the cage. 25. The valve assembly according to claim 21, wherein an end portion of the second closure member is formed with a compound surface comprising two surface portions extending at an obtuse angle to one another to define a ridge, the ridge contacting the seat when the second closure member is in the first, closed position. 26. A valve assembly comprising: a valve housing having a wall that defines a cavity and a channel in the form of an involute, wherein the channel is recessed into a surface of the wall that defines the cavity;an inlet for fluid entering the valve housing;an outlet for fluid leaving the valve housing;a flow control assembly disposed within the cavity of the valve housing between the inlet and the outlet, whereby fluid entering the valve housing is caused to flow through the flow control assembly, the flow control assembly comprising:a cage having apertures therethrough to provide passage for fluid passing from the inlet to the outlet, wherein the apertures in the cage are angled toward the outlet;a closure member moveable with respect to the cage between a first closed position, in which the closure member closes all of the apertures in the cage, and a second open position, in which all the apertures in the cage are open; andwherein a cross-sectional width of the channel tapers from the inlet in a direction about a circumference of the wall, and wherein the channel is configured to gradually direct the fluid towards the flow control assembly. 27. The valve assembly according to claim 26, wherein the inlet is arranged in the valve housing to extend tangentially to the wall defining the cavity, such that, in use, fluid is caused to enter the cavity circumferentially along the wall. 28. The valve assembly according to claim 27, wherein the cavity comprises a channel extending circumferentially its wall extending around the flow control assembly, in use the inlet directing an incoming fluid stream into the channel. 29. The valve assembly according to claim 28, wherein the channel has a form of an involute. 30. The valve assembly according to claim 29, wherein the channel has a progressively smaller cross-sectional area travelling in a direction of flow of fluid in the channel. 31. An apparatus, comprising: a valve housing having a wall that defines a cavity and a channel in the form of an involute, wherein the channel is recessed into a surface of the wall that defines the cavity;an inlet for fluid entering the valve housing;an outlet for fluid leaving the valve housing;a flow control assembly, the flow control assembly comprising: a cage having apertures therethrough to provide passage for fluid passing from the inlet to the outlet;a closure assembly configured to open and close the apertures in the cage; andwherein a cross-sectional width of the channel tapers from the inlet in a direction about a circumference of the wall, and wherein the channel is configured to gradually direct the fluid towards the flow control assembly.
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이 특허에 인용된 특허 (24)
Madison, Kent R., Aquifier flow controlling valve assembly and method.
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