Patent ID: 7975324
Filing Date: 2011-07-12
Classification: E03D

Abstract:
1. A dual flush system comprising: a pressure flushing tank having an inlet and an outlet; a retention tray adapted to be disposed within the pressure flushing tank, the retention tray having a housing comprising a bottom portion, a sidewall, and a central opening located in the bottom portion with a column rising therefrom and forming a wall, the retention tray being open to the pressure flushing tank at a top portion, the housing defining a volume; a flush valve for controlling the outlet, the flush valve disposed within the central opening; a retention tray valve disposed in the retention tray, the retention tray valve providing a controllable opening through the housing; and the retention tray valve further having a valve seal engagable with a valve seat disposed in the housing and further engagable with a valve stem for manipulating the position of the valve seal in relation to the valve seat, wherein frictional forces between the valve seal and the valve seat retain the retention tray valve in a closed position when the pressure flushing tank is filled.