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1. (EP1913207) AUTOMATIC FLUID FLOW CONTROL DEVICE
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Claims

1. An automatic fluid flow control device (30) for a fluid supply (3, 4; 35; 41; 80), wherein the device is operable without an electrical supply, and comprises an actuator (7; 52; 71; 76) located in a first section of the device, and a valve located in a second section of the device that forms a fluid supply channel, said second section being separated from said first section by a wall, said actuator being movable from a first position corresponding to a normal,fluid supply to a second position corresponding to a fluid oversupply, the actuator (7; 52; 71; 76) being configured to exert a magnetic force through said wall on the valve (10, 11; 55; 82) in said fluid supply channel (3, 4; 35, 38; 41; 80) as the actuator (7; 52; 71; 76) moves from said first to said second position to close said valve (10, 11; 55; 82) and thereby at least substantially shut-off fluid flow through said fluid supply channel (3, 4; 35; 41; 80) until the device (30) is reset.
  2. A control device according to Claim 1, wherein the actuator (7; 52; 71; 76) includes a magnet (8; 53; 74; 79) for exerting said magnetic force on said valve (10, 11; 55; 82).
  3. A control device according to Claim 2, wherein the actuator (7; 52; 71; 76) and valve (10, 11; 55; 82) each include a magnet, the magnets (8, 12, 13; 57, 53; 57, 74; 53, 57; 79, 84) interacting to exert said force on said valve (10, 11; 55; 82) that urges said valve (10, 11; 55; 82) closed as the actuator (7; 52; 71; 76) moves from said first position to said second position.
  4. A control device according to Claim 2, wherein the actuator (7; 52; 71; 76) and valve (10, 11; 55; 82) each include a magnet, the magnets (8, 12, 13; 57, 53; 57, 74; 53, 57; 79, 84) interacting to exert said force on said valve that urges said valve (10, 11; 55; 82) open as the actuator (7; 52; 71; 76) moves from said second position to said first position.
  5. A control device according to Claim 3 or 4, wherein said magnets (8, 12, 13; 57, 53; 57, 74; 53, 57; 79, 84) are arranged in said first position with different magnetic poles adjacent, and in said second position with like magnetic poles adjacent.
  6. A control device according to any preceding claim, wherein said first section comprises a chamber (60) and the actuator comprises a float (52) located in said chamber (60), the chamber comprising an inlet (40) for connection to an overflow pipe and an outlet (41) for connection to a drain, the arrangement being such that fluid can flow into said chamber (60) via said overflow inlet (40) to cause said float (52) to move from said first position to said second position as the fluid level within the chamber (60) increases.
  7. A control device according to Claim 6, wherein the outlet (41) is configured to be capable of passing a smaller volume of fluid per unit time than the inlet (40).
  8. A control device according to Claim 7, comprising a stopper (61) for the outlet (41) which stopper (61) reduces the volume of liquid that can flow through said outlet (41) per unit time.
  9. A control device according to Claim 8, wherein the stopper (61) is removable from the outlet (41).
  10. A control device according to Claim 8 or 9, wherein the stopper (61) includes a plurality of cut-away wall portions (63) to permit fluid flow therethrough.
  11. A control device according to any of Claims 6 to 10, wherein the float (52) is pivotable between said first and second positions.
  12. A control device according to any preceding claim, wherein the actuator (7, 8, 9; 71; 76) is capable of acting on a second valve in a third section of the device that forms a second fluid supply channel as the actuator moves from said first to said second position.
  13. A control device according to any of Claims 1 to 11, comprising a second actuator (52) located in said first section of the device, said second actuator being capable of acting on a second valve in a third section of the device that forms a second fluid supply channel (38) to cause the second valve to move from an open position to a closed position as the second actuator (52) moves from a third position that corresponds to said first position to a fourth position that corresponds to said second position.
  14. A control device according to any of Claims 1 to 5, wherein said first section comprises a chamber (60) and the actuator comprises a receptacle (71) located in said chamber (60), the chamber comprising an inlet (40) for connection to an overflow pipe and an outlet (41) for connection to a drain, the arrangement being such that fluid can flow into said chamber (60) via said overflow inlet (40) and into said receptacle (71) to cause said receptacle (71) to move from said first position to said second position as the fluid level within the receptacle (71) increases.
  15. A control device according to Claim 14, wherein the receptacle (71) comprises a drain (73) to permit fluid to drain therefrom, and from the chamber (60) via said outlet (41).
  16. A control device according to Claim 14 or 15, wherein the receptacle (71) is resiliently biased away from a wall of the chamber in said first position and movable against said bias to said second position.
  17. A control device according to Claim 16, wherein said receptacle (71) is resiliently biased (72) away from a floor of the chamber, the receptacle (71) compressing said resilient bias (72) as it moves from said first position to said second position.
  18. A control device according to any of claims 14 to 17 when dependent on any of Claims 2 to 4, the receptacle (71) having said magnet (74) mounted to a wall thereof.
  19. A control device according to Claim 18, wherein the receptacle (71) includes a second magnet mounted to an opposing wall of the receptacle (71), the second magnet being capable of acting on a second valve in a third section of the device that forms a second fluid supply channel to cause the second valve to move from an open position to a closed position as the receptacle (71) moves from said first position to said second position.
  20. A control device according to any of claims 1 to 5, wherein said first section comprises a chamber and the actuator comprises a bladed member (76) mounted for rotation on an axle (77) located in said chamber, the chamber comprising an inlet (40) for connection to an overflow pipe and an outlet (41) for connection to a drain, the arrangement being such that fluid can flow into said chamber via said overflow inlet (40) and against said bladed member (76) to cause said bladed member (76) to rotate from said first position to said second position to close the valve (75).
  21. A control device according to Claim 20 when dependent on any of Claims 2 to 4, wherein a blade of said bladed member includes a magnet (79) mounted proximate said axle (77) and said valve (75).
  22. A control device according to Claim 21, wherein the bladed member includes a second magnet mounted proximate said axle and a second valve located in a third section of said device, rotation of said bladed member from said first position to said second position causing said second valve to move to a closed position.
  23. A device according to any preceding claim, wherein said valve comprises a flap valve.