Abstract: In the backflush filter (10) according to the invention, in which the flushing back of the filter inserts (15) which are received in several filter chambers takes place by means of flushing filtrate loaded by compressed air, the flush valve (35) and the mud drain valve (39) are actuated by a common drive, whereas the valves or the valve bores (45, 46) are dimensioned in such a manner that the flush valve only releases the connection to the filtrate chamber (19?) of the filter inserts (15?) to be flushed back, when the mud drain valve has already at least partially released the connection between the mud chamber (24?) of the affected filter chamber (14?) with a mud outlet (40). By this, it is ensured in a particularly simple manner that at the backflush process the pressure level in the mud chamber has already dropped before the filtrate for the backflush is loaded with compressed air (see FIG. 2).

Abstract: In the backflush filter (10) according to the invention, in which the flushing back of the filter inserts (15) which are received in several filter chambers takes place by means of flushing filtrate loaded by compressed air, the flush valve (35) and the mud drain valve (39) are actuated by a common drive, whereas the valves or the valve bores (45, 46) are dimensioned in such a manner that the flush valve only releases the connection to the filtrate chamber (19′) of the filter inserts (15′) to be flushed back, when the mud drain valve has already at least partially released the connection between the mud chamber (24′) of the affected filter chamber (14′) with a mud outlet (40). By this, it is ensured in a particularly simple manner that at the backflush process the pressure level in the mud chamber has already dropped before the filtrate for the backflush is loaded with compressed air (see FIG. 2).

Abstract: The flush-back filter according to the invention uses as supporting element for at least one filter element a support cage which is arranged firmly on the inside of the filter housing and is penetrated from the interior to the exterior by the medium to be filtered. At the interior of the support cage a lifting or rotating flush-back device is located which upon its movement passes over the slot-type windows of the support cage in succession. The slot-type windows are arranged on the support cage in several groups in such a way that the windows of the one group are offset against those of the other group(s) in the direction of movement of the flush-back device, in such a way that the windows of the one group lie at least with the webs of another group on a common plane. In this way the entire filter area is subjected to the flush-back operation during this operation only over very small surface areas, with the result that small flush-back volumes can be used and the pressure drop is slight.