Two-stage toilet flush valve assembly

In a dual volume flushing system having a flush tank, an outlet section through which flushing water is conducted from the tank along a vertical axis, a single valve body connected to said outlet section within the tank, a pair of vertically spaced flap valves pivotally mounted on the valve body and actuating means displaceable in one direction for selectively opening one or both of the flap valves to admit water from the tank into the valve body, the improvement residing in said valve body including valve seat portions supporting flap valves in closed positions at different angles to the vertical axis on opposite sides thereof and a single flush lever pivotally mounted within the tank operatively connected in common to both of the flush valves by the actuating means, an overflow tube connected to the valve body above said flap valves and spaced from the vertical axis opposite the flush lever, said valve body extending transversely of the outlet section and at a general incline to a plane perpendicular to the vertical axis.