The Evac Classic is an innovative new model. It is fully pneumatic with an extremely effective one-nozzle flush technology, and a flushing mechanism which is integrated into the push button. It has relatively few simple and reliable moving parts, making it an extremely reliable vacuum toilet. Maintaining the Evac Classic is easy, time-saving and cost effective.
The toilet is flushed by pressing the push button. The water valve opens and lets rinsing water flow into the bowl through the flushing nozzle. After a short delay the discharge valve opens and the contents of the bowl is discharged to the vacuum sewer. The control mechanism then closes the discharge valve and, after a short delay, also the water valve. The delayed closing of the water valve ensures that a small amount of water is left at the bottom of the bowl. The toilet is then immediately ready for the next flush.
See the technical information in the pdf file attachment below: