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How the PF/2 Energizer® Flush Works by GEBERIT®

When ready to be flushed, the PF/2's Upper Chamber is completely filled with water. Since water is non-compressible, the speed by which the Upper chamber can be emptied is controlled by the size of the escape path and the force pushing the water. This regulates how fast the Flush Valve lifts and how quickly the flushmeter tank's Discharge Outlet is opened. Slow opening  lets water fills a bowl's internal raceways more gradually than other pressure discharge devices.

When the PF/2 Energizer^® flushes, it produces a "flood tide" of water to carry bowl wastes on its crest down the drain line. No water is wasted at the start or finish of the flush.

The PF/2 uses less than 1.6 (GPF) gallons or 6 (LPF) litters of water per flush while meeting the highest American, Canadian and Mexico National Standards.
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Tripping the flush lever opens the Actuator Valve. This in turn, opens the flush Valve's Upper Chamber to the Discharge Tube. Since water under pressure always seeks the path of least resistance, the force from the Main Chamber is able to push the Flush Valve up forcing the water trapped in the Upper Chamber out of the unit through the Discharge Tube. As the Flush Valve lifts, opening the Main Discharge Outlet, the compressed air in the Main Chamber accelerates the water out into the Bowl. Extraction occurs.

As water is discharged from the Main Chamber, the Actuator Valve automatically resets, closing the Upper Chamber's exit. Refill water from the supply through the Regulator Valve is diverted simultaneously down the Fill Tube and into the Upper Chamber until the Flush Valve is closed. Water flowing down the Fill Tube first refills the toilet bowl, then fills the Main Chamber to energize it for the next flush.