Square Filters

The Deduster Series SQUARE FILTER consists of cartridge filters, suitable for the handling of the dust in the intake air. Dedusters use a filter element of textile structure, with backpressure blast-cleaning of cartridges. The dusty air enters an area under the cartridges in a tangential way and it loses its speed and the heavier parts, carried by the fluid, fall into the hopper.

The intake air flows through the cartridges with upward lift motion, thus leaving the polluting dust on the cartridge outside. The cartridge jarring because of the compressed air helps the detachment of dust from the cartridge and its falling into the hopper. The polluting remnants in the air are retained by the filter while passing through the cartridge and finally the air, which now is clean, is blown off through a further filter. The cartridges blasted by the compressed air flowing out from a set of nozzles, located over the cartridges. The compressed air let into the Venturi tube installed in each filter-bag calls up the clean air flowing out from other bags and creates a pressure wave which spreads out over the entire length of the bag, thus causing its jarring. The dust falls from the external surface of the bag into the hopper, wherefrom it is taken off for recovery and/or disposal. The air pressure blows, controlled by electronic timer, are released through suitable solenoid valves. The functioning frequency of these valves, as well as the compressed air blowing times and the pause time of the solenoid valves working cycle (the post-washing pre-set time is 15 minutes) may be easily set up. These settings affect the consumption of compressed air and depend on the granulometry, the filtered polluting agent and the carried flow.

This set of cartridge filters is exceptionally compact owing to their high surface / volume ratio. The cartridges are so dimensioned as to insure high filtering efficiency, even when the dust particle size is finest. Their cleaning is insured by reverse-flow cleaning air blows. This action, obtained through a system of solenoid vales controlled from an electronic sequencing board (standard supplied, to be installed by the customer), avoids breaking the system running for cleaning purposes, whilst maintaining a steady flow rate. The filter is provided with inspection manhole, for easy access to the filtering section and checking of the cartridge wearing condition.

On the standard filter configuration, the cartridges are replaced from the top in the clean area, with consequent significant reduction of the servicing times; however, on customer`s request, cartridges may also be taken off from the bottom "dirty" area, through proper cleanouts.

Max. operative temperature: 70° C.

The standard cartridges in our filters are made of high-quality non-woven fabric, consisting of polypropylene fibres coated with polyethylene, heat bonded on the entire surface, antistatically treated with permanent graphite-doping and having cross weft, conforming to the standard DIN 54345 and ATEX 94/9/CE , with class of filtration according to DIN EN 60335-2-69 enclosure AA: M.

The cartridges may be constrained to the partition surface between the “clean” and the “dusty” zones, both on the top and on the bottom. In both cases, the cartridges may be easily taken off, since they are fastened by three bolts only; once bolts have been loosened, a simple rotation of the cartridge allows pulling it off completely. For special types of dust or special applications, other types of cartridges may be used, having different features. For details, please contact our technical department.

The SQUARE FILTER is normally painted as follows: Filter body is painted blue RAL 5007 / Handrails, step irons, maintenance doors and truck container are painted orange RAL 2004. On request, other optional RAL painting colours may be used. As standard, the filter is equipped with a power pack type GCP 4P (max. 4 solenoid valves) or GCP6P (max. 6 solenoid valves) for control of the solenoid valves intended for pneumatic washing of the filter cartridges.