The flush valve from Netafim is used to automatically flush the lines of a drip system at the start of each irrigation cycle. Installed at the end of each drip line or drip lateral, the flush valve releases approximately one gallon of water each time the zone is turned on. If installing an automatic flush valve, make sure to cover it with an 8” irrigation box. We suggest observing the flushing operation after the completion of the installation to ensure that each valve is flushing properly, and then to repeat this observation at the beginning of each irrigation season. Check the pressure and compare to the last maintenance inspection.
The flush valves from Netafim Irrigation eliminate the need for periodic manual flushing within a drip irrigation system. These devices are not required on a zone with Excel CV PC drip line due to its emitter check valve feature, but they work well with all other drip line as a means of flushing the lines automatically at the beginning of each irrigation cycle.
If the line flushing valve does not seal (continues to flush), disassemble the flush valve. Inspect all components, cleaning or replacing as necessary, and reassemble. You should be able to blow and draw air through the drip emitter that is attached to the diaphragm, and the diaphragm should be free of any rips or tears.
Damage may occur if the flush valve has been subjected to higher than recommended pressure (greater than 50 PSI).
If manual flush valves or flush ports have been installed in lieu of line flushing valves, they should be opened and the system flushed at least three times in each irrigation season until the flowing water is visibly clean. The zone may need to be flushed more frequently depending on the quality of the water source.
Flushing of a drip system is highly recommended anytime that the system has been repaired.