Filter is an indispensable device on the transmission medium pipeline. It is usually installed at the inlet of pressure reducing valve, pressure relief valve, constant water level valve, square filter and other equipment.

The filter is composed of cylinder, stainless steel filter screen, sewage part, transmission device and electrical control part. After the water to be treated passes through the filter cartridge of the filter screen, its impurities are blocked. When it needs to be cleaned, just take out the removable filter cartridge and reinstall it after treatment. Therefore, it is very convenient for use and maintenance.

The filter is composed of simplified, stainless steel filter screen, sewage part, transmission device and electrical control part. When the filter works, the water to be filtered enters the pipeline required by the user through the outlet through the filter screen at the water inlet for process circulation, and the particulate impurities in the water are intercepted in the filter screen. With such continuous circulation, more and more particles are intercepted and the filtration speed is slower and slower, while the imported sewage still enters continuously, and the filter hole will be smaller and smaller, resulting in a pressure difference between the inlet and outlet. When the large difference reaches the set value, the differential pressure transmitter transmits the electrical signal to the controller, and the control system starts the drive motor to drive the shaft through the transmission assembly, At the same time, the drain outlet is opened and discharged from the drain outlet. After the filter screen is cleaned, the differential pressure drops to the bottom, the system returns to the initial filtration state, and the system operates normally.

The filter is composed of shell, multi-element filter element, backwashing mechanism, differential pressure controller, etc. The diaphragm in the shell divides its inner cavity into upper and lower cavities. The upper cavity is equipped with a plurality of filter elements, which makes full use of the filtering space and significantly reduces the volume of the filter. A backwashing suction cup is installed in the lower cavity. During operation, the turbid liquid enters the lower chamber of the filter through the inlet and the inner chamber of the filter element through the diaphragm hole. Impurities larger than the filter element gap are intercepted, and the purified liquid passes through the gap to the upper chamber and then sent out from the outlet.

The filter adopts high-strength wedge-shaped filter screen and automatically cleans the filter element through differential pressure control and timing control. When the impurities in the filter accumulate on the surface of the filter element, causing the inlet and outlet differential pressure to increase to the set value, or the timer reaches the preset time, the electric control box sends a signal to drive the backwash mechanism. When the inlet of the backwashing suction cup is aligned with the inlet of the filter element, the blowdown valve is opened. At this time, the system releases pressure and discharges water. A negative pressure zone with a relative pressure lower than the water pressure outside the filter element appears inside the suction cup and the filter element, forcing part of the net circulating water to flow from the outside of the filter element into the inside of the filter element. The impurity particles adsorbed on the inner wall of the filter element flow into the pan with the water and are discharged from the blowdown valve. The specially designed filter screen produces a spraying effect inside the filter element, and any impurities will be washed away from the smooth inner wall. When the pressure difference between the inlet and outlet of the filter returns to normal or the timer setting time ends, the flow of materials is not cut off in the whole process, and the backwashing water consumption is less, so as to realize continuous and automatic production.