BOLLFILTER Automatic Type 6.21/6.22

Backflushing filter for fuel oil for small volumes
Flange Connection
DN 50 (optional with Adapter to DN 32 / 1 1/4") / 2"
Filter element
Grade of filtration
optional 10 µm, 25 µm, 34 µm or 48 µm
Pressure stage
PN 16
Operating temperature
max. 160°C
Filter housing
nodular cast iron
Optional equipment
- Bypass filter with change-over valve
- Integrated heating chamber
BOLLFILTER Automatic Type 6.21/6.22
Video BOLLFILTER Automatic Type 6.21

BOLLFILTER Automatic Type 6.21/6.22 for small volumes

The BOLLFILTER Automatic Type 6.21 has been especially designed for the filtration of lower and continuous filtration volumes of liquid fuels.

Compact Design: The Type 6.21 is engineered with a compact design suitable for installations where space is limited or where only small volumes of fuel oil need to be filtered. Despite its smaller size, it offers efficient filtration performance.

Automatic Backflushing: Similar to other BOLLFILTER models, the Type 6.21 features an automatic backflushing system. This system periodically reverses the flow of fluid through the filter element to dislodge and remove trapped contaminants, ensuring continuous and reliable filtration without the need for manual intervention. When required, the media is cleaned one segment at a time by a rotating backflush unit, without interrupting the filtration process. The working pressure remains almost constant and the flushing volumes are extremely low.

The filter operates predominantly for the protection of diesel injection pumps. It can optionally be equipped with a heating medium connection on the bottom of the housing and with a bypass filter.


Compact fuel filter for optimum protection of the diesel injection pumps ▶ Minimum flush volumes ▶ consistent pressure ▶ Segmental backflushing of the filter
BOLLFILTER Automatic Type 6.21/6.22
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Martin van Son
Martin van Son Head of Filtration for Engines

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