Automatic elektric selfcleaning screenfilter

On this page you can read about thet technical aspects of the filter, the operation and the advantages and disadvantage of the hydraulic selfcleaning screenfilters.

Technical aspects:

• Maximum water temperature: 65^o C, high temperature till 95 ^oC available.
• Maximum flow: 30 m³/h till 200 m³/h.
• Filtration: 120 micron (available from 10 till 3000 micron)
• Water use: 8 liter per backwash.
• Backwash time: 10 seconds.
• Needed pressure: minimum 1 bar and maximum 10 bar, pressuredrop at backwashing: 0,1 bar.
• Minimum flow: 80 liter

Operation

Water enters the filter through the inlet (1) and passes through the coarse screen (2) that functions as a first stop for rough particles. Water then reaches the fine screen (3) which further purifies the flow by separating smaller particles from the water. As more water flows through, impurities build up on the fine screen. As impurities on the screen accumulate, a pressure imbalance is build up between the internal section of the fine screen (3) and its external section.

When the differencen in pressure reaches the preset value on the differential pressure indicator, a series of events is triggered while water continues to flow to the system units. The controller transmits a signal for a ten second flushing cycle. The flushing valves (4) opens, pressure is released from the hydraulic piston (5) and water flows outside. Pressure in the hydraulic camber (6) and the dirt collector (7) is significantly lowered resulting in a suction process via the suction nozzles (8) to the dirt collector (7) and from there to the hydraulic chamber (6) through the flushing valve (4) outside. The electric motor (9) simultaneously rotates the dirt collector (7) around its axis. The pressure is released from the piston (5) and the high pressure inside the filter causes lineair movement of the dirt collector. The combination of the lineair movement and rotation efficiently cleans the entire internal screen (3) surface.

At the end of the ten second cycle the flushing valve (4) closes and the operation of the electric motor (9) is stopped. The increased water pressure returns the hydraulic piston (5) to its initial position. The filter is now ready for the next cycle, with clean and filtered water flowing through the outlet (10).

The ten second flushing cycle resumes operation whenever the difference in pressure reaches the preset pressure value set on the differential pressure indicator. If the pressure difference remains unchanged after one cycle, another cycle will start after a delay of ten seconds.

• The filter can treat water which contains a lot of mud.
• Thr filter is able to reduce the amount of kan het slibgehalte van water aanzienlijk verminderen (van 10% naar 1%).
• The filter can remove particles down to 10 micron.

Disadvantages

• Biological filtration can not take place.
• Chemical filtration can not take place. so the removal of iron is not taking place.

Information about the: automatic hydraulic selfcleaning screenfilter.

Here you can find an overview of filtersystems.

Overview filtration-subjects.