Liquid volume control for a liquid storage tank

Claim 1

In combination with a tank having an interior liquid storage chamber, a liquid inlet connected to said tank for supplying liquid into said storage chamber, an outlet located within said tank for exit of liquid from said storage chamber, an outlet valve assembly connected with said outlet, said outlet valve assembly being movable between a closed position preventing exit of liquid from said storage chamber and an open position permitting exit of liquid from said storage chamber, the improvement comprising: a damming wall located within said tank separately dividing said storage chamber into a first chamber and a second chamber, said damming wall being in snug substantially water-tight contact with the wall surface of said storage chamber but not fixed to said wall surface by any fastening device thereby facilitating location and removal of said damming wall, both said outlet and said inlet connecting with said first chamber, said storage chamber having a pre-established first level for liquid when full and a second level for liquid when empty; a first opening located within said damming wall intermediate said first level and said second level of liquid but substantially nearer said second level, said first opening connecting with a valve member, said valve member being attached to said damming wall and being formed of thin, flexible sheet material, said valve member being movable between a closed position completely covering said first opening and preventing passage of liquid therethrough and an open position permitting passage of liquid therethrough between said first and second chambers; and actuation means connected to said valve member, said actuation means movable between a first location and a second location, with said actuation means in said first location the said valve member being in said closed position when liquid within said second chamber is at or near said first level and liquid within said first chamber is at or near said second level, with said actuation means in said first location with liquid in both said first and second chambers at or near said first level the said valve member being located in said open position permitting circulation of liquid between said first and said second chambers, with said actuation means in said second location the said valve member being located in said open position permitting said second chamber to discharge liquid into said first chamber.