Automatic Backwash Filters and Strainers

Fully automatic Filtration

BOLLFILTER automatic filters and strainers are automatic backwash units for the filtration of low-viscosity liquids. The filters guarantee uninterrupted and trouble-free operation of industrial or maritime plants and engines. Your advantage: With these reliable filter systems you also extend the maintenance intervals, thereby keeping your operating costs low and avoiding unwanted production shutdowns.

Functionality of the self-cleaning Filters

Filtration Stage

The medium flows through the filter element either from inside to outside or from outside to inside. Here the dirt particles are retained and the cleaned medium reaches the filter outlet. When the differential pressure reaches a certain value, a signal is transmitted from the differential pressure indicator to the control unit, which automatically triggers the backwashing process.

Backflushing Phase

When the differential pressure reaches a certain value, the differential pressure indicator transmits a signal to the control system, which automatically triggers the backwashing process. During backflushing, the dirt particles are flushed off of the filtration surface by filtered fluid reversal of flow (own medium or through external flush medium, compressed air or service water).

The following automatic filters can be used, depending on the flow rates, rate of filtration and fluids. Here you find an overview of our automatic backwash filters (self-cleaning):

Automatic Self-Cleaning Filter, Backwashable Strainer

BOLLFILTER Automatic Type 6.72 Standard fuel oil automatic self-cleaning filter »

Flange Connection

DN 40 - DN 80 / 1 ½" - 3"

Filter element

wire-mesh and star pleated candles (made of stainless steel with smooth surface)

Grade of filtration

6 µm - 200 µm

BOLLFILTER Automatic Type 6.04 Automatic Backflushing Filter, Self-Cleaning Strainer for low flow volumes »

Flange Connection

FNPT DN 40 / 1 ½"

Filter element

Screw-in candles (stainless steel)

Grade of filtration

10 µm – 500 µm

BOLLFILTER Automatic Backwashing Filter, Self-Cleaning Strainer welded Type 6.18 »

Flange Connection

DN 500 - DN 1000 / 20" - 40"

Filter element

wedge wire, longitudinal wedge wire candle or wire-mesh candle with smooth surface

Grade of filtration

10 µm - 5 mm (depending on the size of the filter)

BOLLFILTER Automatic Type 6.18.2 Heavy Duty, Automatic Self-Cleaning Strainer, Backwashing Filter »

Flange Connection

DN 200 - DN 1000 / 8" - 40"

Note

The filter type 6.18.2 is suitable for difficult operating conditions, e. g. for the filtration of river water, sea water or ballast water.

Filter element

wedge wire candle with smooth surface and hydrodynamic element

BOLLFILTER Automatic Backwashable, Self Cleanable Filter, Strainer Type 6.19 with external flushing supply »

Flange Connection

DN 50 - DN 400 / 2" - 16"

Filter element

wedge wire, longitudinal wedge wire candle or wire-mesh candle with smooth surface

Grade of filtration

10 µm - 5 mm *

BOLLFILTER Automatic Type 6.48 Efficient continuous backflushing automatic filter »

Flange Connection

DN 40 - DN 300 / 1 1/2" - 12"

Filter element

wire-mesh candles

Grade of filtration

10 µm to 48 µm

BOLLFILTER Automatic Type 6.64 Automatic Self-Cleaning filter »

Flange Connection

DIN Only DN 100 - DN 400 (Approx. 4" - 16")

Filter element

wire-mesh and star pleated candles (made of stainless steel with smooth surface)

Grade of filtration

6 µm - 50 µm

BOLL FILTRATOR Type 8.64/8.72 Fine filtration for low pressure systems »

Flange Connection

DN 65 - DN 150 / 2 ½" - 6"

Filter element

screw-in candles with star-pleated stainless-steel wire mesh

Grade of filtration

6 µm absolute, 10 µm absolute

BOLLFILTER Automatic Type 6.03 AOT The 2-in-1 solution for water filtration, backwashable and with UV disinfection »

Flange Connection

DN 40 / 1 ½"

Filter element

Slotted and mesh candles

Grade of filtration

Nominal filtration grade: 50 - 100 µm

Ballast Water Filter aquaBoll BWT »

Flange Connection

DN 80 - DN 600 / 3" - 24"

Note

Automatic self-cleaning pre-filtration of sea-water, for the protection of ballast water treatment systems

Filter element

special plated basket with mesh made of super duplex

BOLLFILTER Automatic Type 6.21/6.22 fuel oil filter »

Flange Connection

DN 50 (optional with Adapter to DN 32 / 1 1/4") / 2"

Filter element

Multi-Segment

Grade of filtration

optional 10 µm, 25 µm, 34 µm or 48 µm

aquaBoll® Automatic Self-Cleaning Water Filter, backwashable strainer with adaptive filter elements »

Flange Connection

DN 50 to DN 500 / 2" to 20"

Filter element

Fine sieve cylinder element, Filter candle element, Sieve cylinder element

Grade of filtration

10 µm - 5 mm

KSS BOLLFILTER Automatic Type 6.64 »

Flange Connection

DN 100 to DN 400 / 4" to 18"

Filter element

wire-mesh candles (optional made of stainless steel with smooth surface)

Grade of filtration

6 µm - 150 µm

engineBoll automatic filter for lube oil and fuel oil filtration »

Flange Connection

DN 50 to DN 300

Filter element

Muliti-Segment

Grade of filtration

1µm - 50µm