Flush valve for water tank in a toilet system

Claim 1

A dual control for releasing water from a holding tank of a toilet system wherein the tank has a floor and a main drain, comprising: a hollow upstanding tower having an upper end zone and a lower end zone and defining a through passageway between the end zones, said lower end zone including means to connect to the main drain of the tank for fluid communication with the hollow of the tower, said upper end zone having an outwardly extending throat means terminating at an upper, upwardly facing opening in fluid communication with the tower passageway and said upper opening being at a first predetermined height above the floor and comprising first seat means, said tower including an intermediate zone between said upper opening and the lower end zone and said intermediate zone having an outwardly extending throat means terminating at a lower upwardly facing opening in fluid communication with the tower passageway at a second predetermined height below said first predetermined height and comprising second seat means, said openings each having a center on opposite sides of the tower and defining a reference plane, an operator lever aligned with said reference plane and said lever having a first end and a second end and means pivotally connecting the lever between the first and second ends to the upper end zone of the tower above the upper opening, a flush tank actuating handle, said handle including a bifurcated arm pivotally coupled to said first end of said operator lever, a first lever pivotally connected to the tower above said upper opening and a second lever pivotally connected to the tower above said lower opening and each of said levers having a free outer end, first and second stopper means seated on each of said first and second seat means and normally closing the upper and lower openings, and connected to said first and second lever outer ends respectively, first chain means connecting the first end of the operator lever to said first stopper means seated on said upper opening and second chain means connecting the second end of the operator lever to said second stopper means seated on said second opening, each of said first and second chain means being of a predetermined length neither too loose nor taught when said first and second stopper means are in seated engagement with said first and second openings, whereby, when the operator lever is tilted in one direction of rotation by movement of said flush tank actuating handle, said first stopper means will be lifted from the first seat means permitting water to flow through the upper opening and when the operating lever is tilted in the other direction of rotation, the second stopper means will be lifted from the second seat means of the lower opening to permit water to flow through the passageway of the tower effecting, optionally, a heavy flush or a light flush.