Patent ID: 6886588

Claim:
A buoyancy flushing apparatus comprising: a reservoir for accumulating liquid, having: an inlet for receiving liquid; an outlet chamber recessed in a bottom wall of the reservoir; the outlet chamber including an outlet for draining liquid out of the reservoir; an outlet valve movable between a down position where liquid accumulates in the reservoir and a raised position where liquid accumulated in the reservoir is flushed out via the outlet, the outlet valve comprising: a ballast unit sized and shaped to fit loosely in the outlet chamber when said valve is in the down position; a float unit topping the ballast unit to move said valve in the raised position by buoyancy when a sufficient amount of liquid is accumulated in the reservoir, thereby providing a passageway for liquid at least partially defined by an outer wall of the float unit, an outer wall of the ballast and the bottom wall of the reservoir the passageway leading to the outlet in the outlet chamber to flush liquid out of the reservoir, a guiding means for guiding the outlet valve between the down position and the raised position; and a seal to completely close the outlet chamber when the valve is in the down position.