How the filter is backwashed?

The tubular backwash filter is provided with a plurality of filter tubes inside, and the sewage flows from the outside of the filter tube to the inside of the filter tube, and then flows out from the liquid collection chamber of the filter. The control adopts pressure difference/time control. When the pressure difference between the inlet and outlet of the filter reaches the set pressure difference limit, the filter enters the reverse flushing process.

In order to ensure the good operation of each filter tube, the control system closes the corresponding inlet valve and outlet valve according to the pressure difference at both ends (up to 0.1MPa) or when the filter tube reaches the specified self-cleaning time (for example, 120min), and simultaneously opens the corresponding water inlet valve and outlet valve. drain valve and backwash valve.

The cleaning fluid connected to the backwash pipeline thoroughly cleans the filter tube from top to bottom, and is discharged through the sewage pipeline, then closes the sewage valve and the backwash valve, opens the water inlet valve and the water outlet valve for normal filtration, and the control system continues to the next The filter tube performs a backwashing action to circulate. When the control system performs the backwashing action on each filter tube, the water inlet valve and the water outlet valve corresponding to the other filter tubes are open to ensure the normal filtering operation of the remaining filter tubes.Poolking.