BOLL & KIRCH

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.

Application Areas of our Backwash Filters

  • filtration of liquids (sea water, cooling water, ballast water, industrial and service water)
  • lubricating oil filtration
  • filtration of liquid fuels and cooling lubricants in power plants, technical plants and in the marine industry

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 »

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 »

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 »

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 »

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 »

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 »

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 for large engines »

BOLLFILTER Automatic Type 6.64 Automatic Self-Cleaning filter for large engines
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 »

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 »

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 BOLLFILTER Automatic Self-Clean Type 6.18.3, online backwashing »

Ballast Water Filter BOLLFILTER Automatic Self-Clean Type 6.18.3, online backwashing
Flange Connection
DN 200 - DN 900 / 20" - 36"
Note
Automatic self-cleaning pre-filtration of sea-water, for the protection of ballast water treatment systems
Filter element
Cylindrical candles open at both ends; mesh made of super duplex (1.4410)

BOLLFILTER Automatic Type 6.21/6.22 Cost-effective fuel oil filter »

BOLLFILTER Automatic Type 6.21/6.22 Cost-effective 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 »

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 »

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