Float operated fill valve

A liquid level control assembly for maintaining a predetermined liquid level in a tank, said assembly comprising:

• a supply conduit extending between a supply of liquid and the tank and a first valve in said supply conduit;
• a float chamber having a bottom wall disposed above the lowermost portion of the tank;
• a float within said float chamber movable in response to liquid level variations between upper and lower positions;
• connecting means connected between said float and said first valve for closing said first valve when said float rises to said upper position and for opening said first valve when said float falls from said upper position;
• means providing liquid communication between the tank and said float chamber when liquid in the tank rises to a level spaced above said chamber bottom wall;
• a drain flow path extending between the float chamber and the tank and a second valve in said drain flow path permitting flow from the float chamber to the tank when liquid level in the tank is below the level in the chamber;
• and
• a level sensing flow path extending between the float chamber and the tank and a float controlled third valve permitting flow between the tank and said float chamber through said level sensing flow path only when said float is above said lower position.

A fill valve assembly for maintaining a selected water level in a toilet water tank, said fill valve assembly comprising:

• an inlet port for pressurized water;
• a supply conduit connected to said inlet port;
• a main valve connected to said supply conduit;
• an outlet conduit extending from said main valve to the tank;
• a float;
• a float chamber containing said float;
• a weir permitting water to spill from the tank into said float chamber only when the water level in the tank is spaced above the bottom of said float chamber;
• a drain valve in the bottom of said chamber permitting flow from the chamber to the tank only when the level of water in the tank is substantially below the level in said chamber;
• and
• a float controlled valve in a wall of said chamber permitting direct communication between the tank and the chamber only after a rising water level in said tank reaches the height of said weir.