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1. (US20100314565) Automatic fluid flow control device
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Claims

1. An automatic fluid flow control device for a fluid supply, wherein the device is operable without an electrical supply, and comprises:
an actuator housing having a plurality of walls that cooperate to define an internal actuator void, said actuator housing having an inlet through which an oversupply of fluid can flow into said void and an outlet through which fluid can flow from said internal void to a drain;
an actuator comprising a first magnet, said actuator being located in said void and being movable by an oversupply of fluid flowing into said void via said inlet between a first position corresponding to a normal fluid supply and a second position corresponding to a fluid oversupply;
a valve housing provided in said fluid supply and arranged so that fluid in said supply can flow through said valve housing; and
a valve pivotally mounted in said valve housing for movement between an open position where fluid can flow through said valve housing and a closed position where fluid flow through said valve housing is at least substantially shut-off, said valve comprising a second magnet;
wherein the actuator and valve are configured and arranged so that said first magnet exerts a magnetic force through a said wall of said actuator housing on the second magnet as the actuator moves from said first position towards said second position, the magnetic force causing said valve to move from said open position towards said closed position, whereupon fluid flowing through said valve housing urges said valve to said closed position, whereupon fluid pressure holds said valve in said closed position whilst the actuator returns to said first position and until the device is reset.
2. A control device according to claim 1, wherein said magnets are arranged in said first position with different magnetic poles adjacent, and in said second position with like magnetic poles adjacent.
3. A control device according to claim 1, wherein the actuator comprises a float.
4. A control device according to claim 1, wherein the outlet is configured to be capable of passing a smaller volume of fluid per unit time than the inlet.
5. A control device according to claim 4, comprising a stopper for the outlet which stopper reduces the volume of liquid that can flow through said outlet per unit time.
6. A control device according to claim 5, wherein the stopper is removable from the outlet.
7. A control device according to claim 5, wherein the stopper includes a plurality of cut-away wall portions to permit fluid flow therethrough.
8. A control device according to claim 3, wherein the float is pivotable between said first and second positions.
9. A control device according to claim 1, wherein the actuator comprises a second magnet, the actuator being configured and arranged to exert, as the actuator moves from said first position towards said second position, a magnetic force through a said wall of said actuator housing on a valve magnet carried by a second valve in a second valve housing that is coupled to a second fluid supply.