self clean filter system

filter system is a sophisticated yet easy-to-operate automatic filter, with a  self-cleaning mechanism driven by an electric motor. The filter system is also equipped with pump,  control panel, isolation valves, and check valve all installed on a skid. The AF filter system is  designed to work with various types of screens in filtration degrees from 10 to 500 micron (20-500 micron). The water enters through the pump inlet into the filters coarse screen from outside in, and through the fine screen from inside out. The "filtration cake" accumulates on the fine screen surface and  causes pressure differential to develop. The coarse screen is designed to protect the cleaning mechanism from large dirt particles and is not  cleaned automatically. Usually, it does not accumulate large quantities of suspended solids that will  inhibit system flow.

Self-cleaning process: The AF series liquid  system initiates the self-cleaning process when either the pressure differential  across the screen reaches a pre-set value (typically 7 psi) or the flush timer reaches its preset timed  interval.  The fine screen filter element is cleaned by the suction scanner with spring loaded nozzles, which  rotates in a spiral movement while removing the filtration cake from the screen, and expels it out  through the exhaust valve. A 2-way (fwd/rev) drive unit that is attached to the scanner by a threaded shaft rotates the scanner  and provides the linear motion to clean the screen. The hydraulic exhaust valve is activated for the duration of the cleaning cycle by a 3-way solenoid.  During the 20 seconds self-cleaning process, filtered water continues to flow downstream of the  filter. System Operation modes: The filtration system may be found in one of the following modes: 1. Filtering mode: This is the normal operating status. The flush mode is idle and the power light  on the control board is lit. 2. Self-cleaning mode: The motor and exhaust valve are activated according to the previously  described self-cleaning process. 3. Malfunction mode: If the filter malfunctions, the self-cleaning operation stops and the  malfunction light on the control board is turned on.