Title: 320- Tilbakeslagsventil.pdf
Back-siphoning When the pressure in the water supply network falls, the second check valve closes against the seat. The first check valve closes against the diaphragm, the discharge opening opens to the intermediate zone, once enough overpressure is created. This creates an atmospheric "interference" between the water supply network and the contaminated water downstream. If the Water flow check valve is contaminated, seepage is Water flow The pressure in the water supply network ensures discharged via the opening. This prevents The pressure in the water supply network ensures that the diaphragm keeps the discharge opening contamination of the drinking water. that the diaphragm keeps the discharge opening closed; then the first check valve is released from closed; then the first check valve is released from the diaphragm. The water flows to the second the diaphragm. The water flows to the second check valve via the middle chamber and lifts it check valve via the middle chamber and lifts it from its seat. from