Duplex Filter

Change over filter

Duplex filter / Change over filter

Duplex filter
Change over filter

Krone filter manufactures four different types of duplex filters / change over filters. The main difference is the switching device

Type KDF-K - Duplex filter DN15-250 / ½“-10“ uses a so called cock switch
Type KDF-VB - Duplex filter DN50-1000 / 2“-40“ with maintenance-friendly butterfly valve switching
Type KDF-V - Duplex filter DN100-600 / 4“-24“ with smooth valve switching
Type KDF-W - Duplex filter DN15-1000 / ½“-40“ with smooth ball valve switching

Duplex filters can use basket strainers or other kind of filter inserts as filtering media like bags (bagfilters) or cartridges which can be made of different materials beginning from metalls up tp PP, PE, PTFE or glassfibres ect.

KDF-K

Duplex filter

Duplex filter DN15-250 / ½“-10“
Made of ductile cast iron GGG-50/ EN GJS-500-07 or Bronze
Many sizes available from stock
Available with Quick-release clamp
Space saving design

The KDF duplex filter can be used universally as a coarse and fine filter on the suction or on the pressure side. Filter operation is maintained without interruptions during the cleaning phase. The duplex filter is cast as one part consists of two identical single filters which can be operated alternatively or in parallel via a changeover fitting.

The single filter consists of a cast body, cover and filter insert. The filter insert is a basket strainer made of perforated sheet metal covered with a mesh made of different materials and mesh sizes. The medium to be filtered enters the filter from above, generally flowing through the insert from the inside outward. Impurities are caught in the strainer insert, accordingly.

KDF-K - Datasheet ( PDF)
KDF-K DN 15 GR 2 ( PDF)
KDF-K DN 20 GR 2 ( PDF))
KDF-K DN 25 GR 2 ( PDF)
KDF-K DN 32 GR 3 ( PDF)
KDF-K DN 40 GR 3 ( PDF)
KDF-K DN 50 GR 3 ( PDF)
KDF-K DN 50 GR 4 ( PDF)
KDF-K DN 65 GR 4 ( PDF)
KDF-K DN 65 GR 6 ( PDF)
KDF-K DN 80 GR 4 ( PDF)
KDF-K DN 80 GR 6 ( PDF)
KDF-K DN 100 GR 6 ( PDF)
KDF-K DN 125 GR 6 ( PDF)
KDF-K DN 150 GR 7 ( PDF)
KDF-K DN 200 GR 7 ( PDF)
KDF-K DN 250 GR 7 ( PDF)

Duplex filter KDF-K DN 65 GR 4, function and assembly

Lloyd's Register Type Approval certificate ( PDF)

Krone key products are Lloyds Register LR Type approval (Ta) and have design appraisal.

Lloyd's Register Design Appraisal Document ( PDF)

Krone key products are Lloyds Register LR Type approval (Ta) and have design appraisal.

Assembly instruction: Spare part set 1 gaskets ( PDF)

Assembly instruction: Spare part set 2 cover ( PDF)

Assembly instruction: Spare part set 3 bolts, nut and washer for cover ( PDF)

Assembly instruction: Spare part set 4 clamp, bolt and nut ( PDF)

Assembly instruction:Spare part set 4a Change from crewing to clamp ( PDF)

Assembly instruction: Spare part set 5 Differential pressure indicator ( PDF)

Assembly instruction: Spare part set 6 attachments set for differential-pressure-indicator) ( PDF)

Assembly instruction: Spare part set 7 magnetic insert ( PDF)

Assembly instruction: Spare part set 8 insert ( PDF)

Assembly instruction: Spare part set 9 screw plugs: vent, draining and Dp indicator (Diff-Pressure-Indicator) ( PDF)

Assembly instruction: Spare part set 10 pressure equalization line ( PDF)

Assembly instruction: Spare part set 11 switching lever ( PDF)

Assembly instruction: Spare part set 12 cock ( PDF)

Assembly instruction: Spare part set 13 cover gasket ( PDF)

KDF-VB

Duplex filter

Duplex filter DN50-1000 / 2“-40“ with maintenance-friendly butterfly valve switching
Made of ductile cast iron GGG-50/ EN GJS-500-07 (optional with rubber lining inside), Bronze, Steel, Stainless steel, GRP and more
Many sizes available from stock
Available with Quick-release clamp
Tailor made customized solutions

The KDF-VB duplex filter can be installed in pressure and in suction line and is versatile for coarse and fine filtration. It is characterized by continuous operation during the cleaning phase. The duplex filter comprises two identical single filters connected via a valve-switching device with butterfly valves, which can be switched to only one filter body or can be operated in parallel.

Each single filter consists of a cast or welded body, cover and filter insert. The filter insert is a basket strainer or ring type strainer made of perforated plate covered with a stainless steel mesh. The medium to be filtered enters the filter basket from the top and flows through the insert inside out. Dirt thus remains in the filter element.

Product data sheets
Spare Parts

KDF-VB - Datasheet ( PDF)

Recommended spare part sets ( PDF)

KDF-V

Duplex filter

Duplex filter DN100-600 / 4“-24“ with smooth valve switching
Made of ductile cast iron GGG-50/ EN GJS-500-07 (optional with rubber lining inside) or Bronze
Available with Quick-release clamp

The KDF duplex filter can be used universally as a coarse and fine filter on the suction or on the pressure side. Filter operation is maintained without interruptions during the cleaning phase. The double filter is cast as one part consists of two identical single filters which can be operated alternatively or in parallel via a changeover fitting.

The single filter consists of a cast or welded body, cover and filter insert. The filter insert is a basket strainer made of perforated sheet metal covered with a mesh made of different materials and mesh sizes. The medium to be filtered enters the filter from above, generally flowing through the insert from the inside outward. Impurities are caught in the strainer insert, accordingly.

Product data sheets
Certificates

KDF-V - Datasheet ( PDF)

Lloyd's Register Type Approval certificate ( PDF)

Krone key products are Lloyds Register LR Type approval (Ta) and have design appraisal.

Lloyd's Register Design Appraisal Document ( PDF)

Krone key products are Lloyds Register LR Type approval (Ta) and have design appraisal.

KDF-W

Duplex filter

Duplex filter DN15-1000 / ½“-40“ with smooth ball valve switching
Tailor made customized solutions (e.g. special closures or heating jacket)
Made of Steel, Stainless steel, GRP and more

The KDF duplex filter can be used universally as a coarse and fine filter on the suction or on the pressure side. Filter operation is maintained without interruptions during the cleaning phase. The double filter is cast as one part consists of two identical single filters which can be operated alternatively or in parallel via a changeover fitting.