Gas filter consists of a shell, multiple filter, backwashing mechanism, electric control box, reducer, electric valves and differential pressure controller and other components. Diaphragm shell of the inner cavity is divided into the upper, two cavity, the upper cavity is provided with a plurality of filter, so as to make full use of the filtering space, significantly reducing the size of the filter, cavity is equipped with a backwashing sucker. When working, the entrance into the filter liquid cavity, cavity and the baffle hole into the filter element. Impurity than filter gap interception, net fluid through the gap reaches the upper cavity, finally from the outlet.

Gas filter, automatic sewage filter core by wedge filter with high strength, through the pressure control, timing control automatic cleaning filter. When the filter impurities caused by the accumulation of pressure difference between the inlet and outlet increases to a set value on the surface of the filter core, driving backwashing mechanism. When the back flushing suction port and filter imports are time, discharge valve is opened, the system pressure relief drainage, chuck and the filter inside a zone of negative pressure relative pressure below the filter lateral pressure, forcing some net circulating water from the filter lateral inflow filter inside, absorb impurity particles in the inner wall of the filter with the water flow into the Rang disc and is discharged from the drain valve. Special design makes the filter screen inside the jet effect, any impurities will be washed from the smooth inner wall. When the filter pressure difference between the inlet and outlet and return to normal or timer setting time is over, the whole process, material does not stop, backwash water less, realized continuous, automated production.