Environmech Sdn. Bhd. since 2012: Automatic hydraulic self-cleaning screen filter in Malaysia (Semenyih, Selangor)

Automatic hydraulic self-cleaning screen filter

Process principle of the automatic self-cleaning filter (a)

Water enters into the entrance. First, the primary strainer filters out the larger particles of

impurities, and then reaches the fine strainer. In the process of filtering, fine strainer

gradually accumulates impurity in the water and forms a filter impurities layer. Due to the

accumulation of impurities layer formed inside the filter, the two sides of the fine strainer form

a pressure gradient. When the pressure gradient reaches the default value, self-cleaning will

begin. During the self-cleaning process, the cleaning valve opens, the hydraulic components

and hydraulic cylinder motor room release pressure and discharge water, causing the

pressure in hydraulic motors room and sewage suction pipe drops sharply. Due to the

negative pressure effect, the dirt is absorbed by suction nozzle inside the fine strainer, enters

into the hydraulic motor room relaying on the hydraulic motors, and then discharges from the

sewage valve, thus finishes a suction sewage process. When the flow passes the hydraulic

motors, it drives sewage suction pipe to rotate whereas the hydraulic cylinder piston drives

the sewage suction pipe for axial movement, sewage suction machine's axial movement and

rotation during the entire filter, clean the surface completely. The entire washing process

4 takes several seconds; sewage valve closes after the washing. Then, the increased of

pressure drives the hydraulic cylinder piston back to its initial position, filter will prepare for

the next wash cycle. In the washing process, the filter's normal operating condition will not

be interrupted.

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