Patent ID: 6595236
Filing Date: 2003-07-22
Classification: F16K,Y10T

Abstract:
A valve comprising a body having an inlet adapted to be connected to a pressurised source of liquid and an outlet which is to communicate with a reservoir, a valve seat between the inlet and outlet, a valve member movable relative to the valve seat between an open and closed position, said valve member having a first face which is movable to be spaced from the valve seat and to be engaged with the valve seat when the valve is in the closed position, said valve member having a second face located in opposed relation to the first face, said second face having a greater area than the area defined on the first face by the valve seat, a chamber located between the body and the second face, a first passageway providing communication between the first face and the chamber, a shuttle member defining a portion of the wall of the chamber and movably supported in the body to be movable between two end positions comprising an innermost position and an outermost position in response to the pressure in the chamber, a closure member supported in the body, the closure member being movable between a closed position at which it is in sealing engagement with the discharge outlet and an open position at which it is clear of the discharge outlet, a bearing member supported from the body and adapted to be associated with a float member to be supported in the liquid in the reservoir, said bearing member being adapted to cause the movement of the closure member to close the discharge outlet when the bearing member is at a first position related to the level of the surface of the liquid in the reservoir when at an upper level and to open the discharge outlet when the bearing member is at a position related to the level of the surface of the liquid in the reservoir when at a lower level, wherein the upper level is spaced upwardly from the lower level, said closure member and bearing member being movable by the shuttle member on movement of the shuttle member between its end positions which results from variations of pressure in the chamber resulting from the movement of the valve between the open and closed positions, wherein when the shuttle member is in its innermost position, the bearing member is at a position corresponding to the upper level of liquid in the reservoir and when the shuttle member is in its outermost position, the bearing member is in a position corresponding to a liquid level intermediate of the upper and lower level of liquid in the reservoir.