Principle

DLHF400 series horizontal autoback backwash screen filter(coarse and fine screens)

 Using a stainless steel screen mesh with both coarse and fine screens, to remove the silt, sand and scale dirt.  Irrigation water containeing a low concentration of organic materials  could be filtered as well. The available flow rate is from 50m3/h to 1000m3/h.

Features:

1. Entirely controlled by the hydraulic pressure in the pipeline, external power is not needed.

2. Fully-automatic control

3. Automatic back wash

How it work

When water enters the coarse screen from the outside (the coarse strainer is set according to the water quality), the coarser impurities are filtered and then enter the fine screen, then the smaller impurities are blocked on the inner filtering element.The filtered water then flows out through the outlet.

Self-cleaning mode can be started by pressing, timing or manual three ways, following the principle of pressure difference.
When the internal and external pressure difference reaches the set value,  the self-cleaning mode starts.Drain pipe hydraulic valve open, sucking the scanner to produce negative pressure suction nozzle inside, absorbing impurities, at the same time sucking scanner in under hydraulic motor along the inside surface mesh do reciprocating screw, movement, no cleaning blind area, impurities by the discharge outlet.
The cleaning time of self-cleaning filter is set by the controller in advance, the drain valve is closed after cleaning, and little water loss in cleaning process.