Tried-and-tested technology in a new design
BACKWASH DRUM FILTER (RTF)
The Backwash Drum Filter is based on the filtration and backwash principle of the Filterautomat. A customized selection of materials is possible for the most difficult media.
Its special design enables a filter fineness of 5 micrometers.
Technical data
Flow rate
max. m³/h
Filter fineness
> µm
Operating pressure
1.5 to bar
Flanges
DN 100 to
Automatic cleaning
Yes
Filter housing
Steel, stainless steel, GRP
Advantages
- High cleaning speed (4-10 m/s)
- 100% cleaning of the entire filter area
- Low flushing water losses
- Robust design
- Shredding of coarse particles
- Fine filtration ≥ 5 μm possible
- Fitted with wedge-wire screens, wire mesh
- Completely wired and tested unit
High productivity
The raw water enters the filter via the inlet flange and flows through the filter drum from the inside to the outside. The solids in the raw water are retained in the segment-like openings on the inner part of the filter drum located on the inside of the filter element. The purified water leaves the filter through the clean water outlet.
Backwashing
A differential pressure measurement in the raw water inlet and the clean water outlet determines the degree of contamination of the filter element. At a defined differential pressure, the backwash process is activated.
An adjustable time relay in the electrical control system additionally enables the backwash process. At the start of filter cleaning, the motor-driven backwash valve opens, generating atmospheric pressure in the backwash line and the hollow shaft in the filter. Due to the excess pressure outside of the filter drum on the clean water side, the solids retained on the inside of the filter element are now forcibly backwashed into the atmosphere against the direction of filtration. The rotation of the filter drum and the flushing shoes attached to it guarantees the 100% cleaning of the filter basket. The flushing process is complete after 15-20 seconds and the backwash valve is closed automatically. Filtration is not interrupted during backwashing.
Drum roll
The filter drum consists of a sturdy inner and outer support basket. The filter element is located between these support baskets. The conical design allows the three individual parts to be fixed and screwed together with perfect dimensional accuracy. The segment-like openings of the outer part of the filter drum can also retain coarser particles. These are then flushed out of the system during the backwash process.
