(1), normal filtering: when the filter need to be normal work, will flow pilot valve is fully open, the water by the entrance into the filter, through a strainer when large amounts of impurities trapped in a mesh inside, clean water through the filter by outlet filter;

    (2), backwashing pollution: when the filters need to drain cleaning, close the water flow direction valve and open the drain valve, the water after the entrance into the water in front of the pilot valve mesh filter the part by filter out, partly from the outer edge of the screen after screen into the pilot valve, the filter inside, flush filter impurities in the outlet of exclusion, the mesh made a thorough cleaning, and the whole cleaning process does not require the system to stop running.

    Control: manual: manually start the mechanism and manually switch. Automatic: electric open points timing control and differential pressure control in two ways, using timing control, equipped with microcomputer timer switch, can implement automatic cleaning sewage according to the requirements of setting time; When the pressure difference control is adopted, the differential pressure controller is installed. When the pressure difference between the inlet and outlet reaches the set value (generally 0.04MPa), automatic cleaning and discharging can be realized without manual operation. At this time, the discharge valve shall be installed with an electric drain valve, and the flow guide valve shall be connected with the electric discharge valve.

    The automatic backwash filtration system consists of a high quality carbon steel cylinder, a special stainless steel wedge filter, a water flow guide valve and a discharge device. All valves may be manual or electrically operated.

    Equipment selection: the equipment specification is generally determined according to the nominal size of the system pipeline, that is, the nominal size of the device's entrance and exit is the same as the nominal size of the system pipe; The maximum flow in the specification parameter table is calculated according to the flow rate of 2.8m/s. The design flow is calculated according to the flow rate of 1.5m/s. The maximum flow rate is the amount of traffic that is allowed to pass in a short period of time. Design flow and the filtration coefficient, the data in the table are selected according to the filtration coefficient of 3.5-4, such as filter coefficient decreases, and the design flow rate should be reduced, such as the filtering accuracy increase, the design flow rate increases, but shall not exceed the maximum flow. When the design flow of the equipment fails to meet the requirements of the system design, the specification of the equipment should be increased until it is satisfied.