FILTER TYPE 2" AAF
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3.4 Mode of Operation
Filtration Process
•
During the filtration stage water flows through the Inlet Manifold, distributing through the Straight flow
Valve to the 2" Spin Klin Filter.
•
The water passes through the Filters Filtration Elements Cleaned and flows out through the Straight flow
Valve to the Outlet Manifold and to the customer.
•
At this stage the Accumulator Tank fills up with clean water from the Outlet Manifold through its Check
Valve.
Back-flushing Process
1.
The Controller/PLC transmits an electric signal to solenoid No.1 (as per pressure differential set point
reach, time set-up or manually whichever comes first).
2.
Command from solenoid No. 1 simultaneously flow to the valves of filter No.1:
a.
To the INLET VALVE (Straight Flow) converting it from filtration mode to back-flush mode.
b.
To the OUTLET VALVE (Straight Reverse Flow) converting it from filtration mode to back-flush
mode.
3.
After Pre-set Valve delay time the Controller/PLC transmits an electric signal to the Valve Delay
Solenoid.
4.
Command from the Valve delay solenoid simultaneously flow to the Accumulator Tank valves:
a.
To the Air Valve, allowing the compressed Air to enter the Accumulator Tank.
b.
To the Check Valve to close the connection to the outlet manifold.
5.
The Compressed Air enters the Accumulator Tank and increase the water pressure in it to the pressure
of the Compressed Air.
6.
The Air is mixed with clean water and is carried to Filter No.1 which is then Back-flushed.
*The ratio between Air and water will rise until there is hardly any water at termination (air alone does
not spin the discs).
7.
At the end time of the Back-flush the Controller/PLC release the command first of the Valve delay
Solenoid then after the same delay time as
paragraph 3 to the Solenoid No.1.
8.
The Accumulator Tank need to fill up with clean water before the next filter can be back-flushed, about
20
–
25 second will be enough.
9.
When the Accumulator Tank is filled up the controller will start back-flush the next filter until all the
filters are clean.
