Duplex Filters
Duplex filters enable efficient filtration and minimal downtime as they have two filter housings that can be used alternately. This design ensures continuous operation of the system even during maintenance or replacement of filter elements. Duplex filters are used in applications where continuous liquid filtration is essential and continuous operation is critical.
BollFilter Duplex Type BFD-C HD M (Coalescer gas filter for Heavy Duty)
| Specification | |
|---|---|
| Features | Duplex filter for separating solids and aerosols (liquid content) from gases |
| Flange Connection | ASME or DIN ¾” – 8” or DN 20 – DN 200 |
| Filter element | Fiberglass/stainless steel disposable cartridges (as normal temperature and high/low temperature design); Option available for preliminary separation using demister, cyclone, or cyclone demister all within the same housing. |
| Grade of filtration | 0,1 - 250 µm |
| Operating pressure | > 500 bar (size and temperature dependent) |
| Filter housing | - carbon steel (St 45-8 / A106B) - stainless steel (1.4404 / 316L) - non-welded |
BollFilter Duplex Type BFD-P HD M (Particle gas filter for Heavy Duty)
| Specification | |
|---|---|
| Flange Connection | ASME or DIN ¾” – 8” or DN 20 – DN 200 |
| Filter element | Fiberglass/stainless steel disposable cartridges. Cleanable elements (star-pleated) made of stainless steel |
| Grade of filtration | 0,5 - 250 µm |
| Pressure stage | >500 bar (size and temperature dependent) |
| Filter housing | - carbon steel (St 45-8 / A106B) - stainless steel (1.4404 / 316L) - non-welded |
BOLLFILTER Duplex Type 2.04.5 (Duplex filter with cast housing and plug changeover for small volume flows)
| Specification | |
|---|---|
| Flange Connection | Spheroidal graphite cast iron DN25 - DN80 Cast stainless steel DN25, DN32, DN50 |
| Switch-over | Plug changeover valve |
| Filter element | Star-pleated element Basket element |
| Grade of filtration | 10 µm - 5 mm |
| Filter housing | Spheroidal graphite cast iron Stainless steel casting |
| Medium | Water, oil, fuel, chemical liquids |
BOLLFILTER Duplex Type 2.05.5 (Double filter with spheroidal graphite cast iron housing and plug switchover for large volume flows)
| Specification | |
|---|---|
| Flange Connection | DN 100 to DN 250 |
| Switch-over | Plug changeover valve |
| Filter element | Basket strainer Candle insert |
| Grade of filtration | 10 µm to 5 mm |
| Pressure stage | PN 10 |
| Filter housing | Spheroidal graphite cast iron |
BollFilter Duplex Type BFD-C/P DBB M (Coalescer and particle gas filter with Double Block and Bleed)
| Specification | |
|---|---|
| Features | A special design duplex filter for separating solids and/or aerosols (liquid content) from gases using a patented double block and bleed main transfer valve. This is intended for applications using high pressures and/or dangerous gas compositions, to ensure maximum operator safety. |
| Flange Connection | ASME or DIN ¾” – 8” or DN 20 – DN 200 |
| Filter element | - Fiberglass/stainless steel disposable cartridges - Option available for preliminary separation using demister, cyclone, or cyclone demister all within the same housing |
BOLLFILTER Duplex Type BFD (Cast filter with ball changeover valve)
| Specification | |
|---|---|
| Flange Connection | DN 25 to DN 150 |
| Switch-over | Ball valve |
| Filter element | Star pleated element Basket element Filter cartridges Disposable filter cartridges |
| Grade of filtration | 0.5 µm to 5 mm |
| Pressure stage | PN10 / PN16 (Higher pressures on request) |
| Filter housing | Spheroidal graphite cast iron Cast steel Stainless steel casting |
BOLLFILTER Duplex Type 2.68.2 / 2.78.2 (Welded filter with ball change over valve and flexible connections)
| Specification | |
|---|---|
| Flange Connection | DN 65 to DN 400 Other nominal sizes on request |
| Switch-over | Up to DN 150 ball valve changeover from DN200 with damper control |
| Filter element | Basket strainer Star sieve Disposable filter cartridge Candle insert |
| Grade of filtration | 0,5 µm to 5 mm |
| Pressure stage | PN 10 / PN 40 (higher pressures on request) |
| Filter housing | Welded Steel Stainless steel Duplex or Super Duplex |