Water saving toilet control valve

In combination with a water closet of the type having a bowl and a water holding tank connecting to said bowl and wherein said holding tank includes a vertically oriented upstanding water pipe located within said holding tank and a holding tank water inlet valve located on the uppermost end of said supply pipe with said valve including a pivot arm forming a part thereof an improvement which comprises:

• said valve being located on said supply pipe at a position above the filled water level in said tank;
• said pivot arm being elongated and having ends and being pivotally attached to said inlet valve proximal to one of its ends with the other of its ends movable between an upwardly displaced closed position and a downwardly displaced open position;
• a vertically oriented linking means capable of moving reciprocally along an essentially vertical axis, said linking means having ends and operatively attaching to said pivot arm adjacent to its upper end, said pivot arm moving between its upwardly displaced closed position and its downwardly displaced open position in response to movement of said linking means along said axis;
• a buoyant float means movably connected to said linking means, said movable float means capable of reciprocally moving vertically within said holding tank in response to movement of the water level in said holding tank as said water level in said holding tank moves between a filled level and a depleted level;
• a float engagement means operatively connecting said buoyant float means to said linking means and capable of transferring movement of said buoyant float means to said linking means;
• said valve including a valve stem, said valve stem operatively connecting to said pivot arm and movable between a first and a second position in response to said pivot arm moving between its upwardly displaced closed and downwardly displaced open positions;
• a retarding means located in operative association with said valve stem and capable of retarding movement of said valve stem between its said first and second positions;
• the combined weights of said linking means and said float engagement means incapable of transferring sufficient force through said pivot arm to move said valve stem against said retarding means from its first position to its second position;
• said buoyant float means capable of interacting with said float engagement means in a first manner as said water level approaches said filled level from said depleted level and said float engagement means in turn interacting with said pivot arm through said linking means with said interaction of said buoyant float means and said float engagement means moving the other end of said pivot arm to said upwardly displaced closed position with said water level arriving at said filled position, said buoyant float means capable of interacting with said float engagement means in a second manner as said water level approaches said depleted level from said filled level and said float engagement means again in turn interacting with said pivot arm through said linking means with said interaction of said buoyant float means and said float engagement means moving the other end of said pivot arm to said downwardly displaced open position concurrently with said water level arriving at said depleted position such that said valve is open when said water level is at said depleted position and when said water level is moving from said depleted position towards said filled position and said valve is closed when said water level is at said filled position and when said water level is moving from said filled position to said depleted position.