The water to be treated by the filter enters into the body from the water inlet, and the impurities in the water are deposited on the stainless steel filter net, resulting in the pressure difference. Through the differential pressure switch to monitor the change of the differential pressure at the inlet and outlet, when the differential pressure reaches the set value, the electric controller will give the hydraulic control valve and drive the motor signal. After the installation of the equipment, the technical personnel shall conduct the commissioning, set the filtering time and cleaning conversion time. The water to be treated enters the body from the water inlet, and the filter starts to work normally. When the preset cleaning time is reached, the electric controller sends signals to the hydraulic control valve and the drive motor, causing the following actions: the motor drives the brush to rotate, cleans the filter element, and at the same time, the control valve is opened Blowdown: the whole cleaning process only lasts for tens of seconds. When the cleaning is finished, close the control valve, stop the motor, restore the system to its initial state, and start the next filtering process. The inside of the filter shell is mainly composed of coarse filter screen, fine filter screen, suction pipe, stainless steel brush or stainless steel suction nozzle, sealing ring, anti-corrosion coating, rotating shaft, etc.

The filter is an indispensable device on the transmission medium pipeline, which is usually installed in the pressure reducing valve, pressure relief valve, constant water level valve, and the inlet equipment of other equipment of the square filter. When the filter has a filter cartridge with a certain size of filter screen, its impurities are blocked. When it needs to be cleaned, it is only necessary to take out the removable filter cartridge and put it in again after treatment. Therefore, it is very convenient to use and maintain.

Most of the first filtration was gravity filtration. Later, pressure filtration was used to improve the filtration speed, and then vacuum filtration appeared. The rotary drum vacuum filter invented at the beginning of the twentieth Century realized the continuous filtration operation. Since then, various types of continuous filters have emerged. The filter of intermittent operation (such as plate and frame filter) has been developed because it can realize automatic operation, and the filtering area is increasing. In order to obtain the filter residue with low moisture content, the filter of mechanical pressing has been developed.