Automatic Self-Cleaning Suction Strainers

The Membrantec automatic suction-type self-cleaning filters utilize a set of sucking scanners that scan point by point along the inner surface of the filter screen to complete the self-cleaning process. During cleaning, the open drain valve is connected to the inside of the hollow suction scanner, creating a high backwash flow rate and generating a “vacuum” at the front of the suction nozzle. This mechanism effectively sucks off and removes the filter cake that has accumulated on the inner surface of the filter screen, discharging it from the filter body.

In operation, raw water enters through the filter’s inlet and passes through the fine screen from inside to outside before exiting through the filter outlet. As impurities accumulate on the inner surface of the screen, they form a filter cake over time. This gradual accumulation causes an increase in the pressure difference between the inside and outside of the screen. Once this pressure difference reaches a preset value (0.5 bar) determined by a pressure difference switch, the filter initiates a self-cleaning process. The cleaning process typically takes around 30 seconds, maintaining continuous flow within the system.