How the TAF Filters Work
Amiad's TAF Series consists of easy-to-operate 2" and 3" automatic filters constructed of high quality plastic and driven by electrical or electronic self-cleaning mechanism. The various types of TAF screens designed to cover a range of 500-10 micron filtration degree and flow rates of up to 50 m3/h (220 US gpm).
The Filtering Process
The water enters the inner area of the screen-cylinder (1) through the filter's Inlet Pipe (2) and flows throughout the screen-mesh to the filter's Outlet Pipe (3). The dirt particles are trapped on the inner screen surface and form a "filtration cake" that causes a differential pressure across the screen.
The Self-Cleaning Process
During the self-cleaning process, while filtered water continues to flow, the filter's Exhaust Valve (4) is opened and the Drive Unit (5) spirals the Suction Scanner (6) back and forth. The spiral rotation of the suction scanner nozzles across the inner surface of the screen "vacuums" the filtration cake out the exhaust valve.
The Control System
The control system consists of: Amiad Electronic Flushing Controller (7), a 3-way Solenoid Valve (8) that controls the filter's exhaust valve and a Pressure Differential Switch (9) that senses the pressure differential across the screen and sends a signal to the controller when it reaches a pre-set value (usually 0.5 bar / 7 psi).
The controller begins a self-cleaning cycle under any of the following conditions:
- Receiving a signal from the Pressure Differential Switch
- Time interval parameter set at the controller by the user
- Manual Start function at the controller's keyboard