In filter stations, dirt builds up in the filter over time. Backwashing (flushing) is the process of removing this dirt from the filter by reversing the direction of the water. The backwash valve is the part that makes this change of direction.
The Role of the Backwash Valve
The valve switches the flow in the station from the normal irrigation position to the washing position. During washing, the dirty water leaving the filter is discharged through the backwash outlet; when you return to the irrigation position, the station supplies clean water again. This way the filter can be cleaned without removing the insert each time.
When Should You Backwash?
When the pressure difference between the filter inlet and outlet rises, the filter is dirty. Monitoring the pressure difference and backwashing when needed or at regular intervals both protects the drippers and keeps the pump from taking unnecessary load.
Sistem Vana Backwash Valves
- 2" backwash outlet, polyamide body model
- 2" backwash and 1" fertigation outlet model
- Coupling-connected model with externally threaded outlet
- 3" (80 mm) and 4" (100 mm) sizes
Points to Watch When Using
- Direct the drain line to a place where the dirty water will cause no harm.
- Set the washing time according to how dirty the filter is.
- Check the valve and the insert at the start of the season.
You can see the models and sizes on the backwash valves page, and for filter selection take a look at our disc and screen filter guide.
