WFIWN25 stainless steel coarse mesh filters up to 14 bar
The WFIWN25 coarse filter has a wrapped element made of stainless steel mesh 1.4301 and traps solid particles larger than 25 µm. It is the first filtration stage: it removes larger contaminants before they reach the finer stages, which then last longer.
The WFIWN25 filter comes in 11 sizes (pipe ø 17.2 to 88.9 mm) with flows of 1,250 to 60,000 l/min at 7 bar; working pressure up to 14 bar. It is one of the stages of the WFIW filters — the housing is the same for all stages, only the element differs.
WFIWN25 filters by size
The size determines the connection and the flow. Each size has its own PF range spare element.
| WFIWN25 filters and spare elements by size | ||||||
|---|---|---|---|---|---|---|
| Filter | Connection | l/min at 7 bar | Nm³/h at 7 bar | Height A × diameter C | Weight | Spare element |
| WFIWN25-005 | welding end ø 17.2 mm | 1,250 | 75 | 202 × 76.1 mm | 1.8 kg | PFN25-005V |
| WFIWN25-010 | welding end ø 21.3 mm | 2,500 | 150 | 240 × 76.1 mm | 2 kg | PFN25-010V |
| WFIWN25-018 | welding end ø 26.9 mm | 3,750 | 225 | 254 × 76.1 mm | 2 kg | PFN25-018V |
| WFIWN25-030 | welding end ø 33.7 mm | 5,250 | 315 | 280 × 88.9 mm | 3 kg | PFN25-030V |
| WFIWN25-047 | welding end ø 42.4 mm | 7,000 | 420 | 337 × 88.9 mm | 3 kg | PFN25-047V |
| WFIWN25-070 | welding end ø 48.3 mm | 10,000 | 600 | 376 × 114.3 mm | 4.3 kg | PFN25-070V |
| WFIWN25-094 | welding end ø 60.3 mm | 15,000 | 900 | 457 × 114.3 mm | 4.8 kg | PFN25-094V |
| WFIWN25-150 | welding end ø 60.3 mm | 21,000 | 1,260 | 583 × 114.3 mm | 5.3 kg | PFN25-150V |
| WFIWN25-175 | welding end ø 76.1 mm | 28,000 | 1,680 | 740 × 139.7 mm | 9 kg | PFN25-175V |
| WFIWN25-200 | welding end ø 88.9 mm | 40,000 | 2,400 | 1,004 × 139.7 mm | 10.8 kg | PFN25-200V |
| WFIWN25-240 | welding end ø 88.9 mm | 60,000 | 3,600 | 1,029 × 168.3 mm | 16.2 kg | PFN25-240V |
The flows apply to a pressure of 7 bar and a temperature of +20 °C. Dimensions according to the manufacturer’s technical data sheet; you will find further data on the product page of each filter.
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When to use it
The coarse filter is suitable at the start of the filtration, where larger contaminants from the compressor or the air line enter the air. It does not trap oil or vapours; the manufacturer does not state an ISO 8573-1 class for it.
Like the housing, the stainless steel mesh withstands up to +150 °C.
Where to place it
After the WFIWC cyclone separator or at the start of the filtration, before the WFIWI20 sintered pre-filter or the WFIWN5 basic filter.
Flow by pressure
The catalogue flows apply to a pressure of 7 bar and a temperature of +20 °C. At a different pressure, they are multiplied by the correction factor: 1.88 at 14 bar.
| WFIWN25 filter flow in l/min by pressure | ||||
|---|---|---|---|---|
| Size (connection) | 4 bar | 7 bar | 10 bar | 14 bar |
| 005 (welding end ø 17.2 mm) | 788 | 1,250 | 1,725 | 2,350 |
| 010 (welding end ø 21.3 mm) | 1,575 | 2,500 | 3,450 | 4,700 |
| 018 (welding end ø 26.9 mm) | 2,363 | 3,750 | 5,175 | 7,050 |
| 030 (welding end ø 33.7 mm) | 3,308 | 5,250 | 7,245 | 9,870 |
| 047 (welding end ø 42.4 mm) | 4,410 | 7,000 | 9,660 | 13,160 |
| 070 (welding end ø 48.3 mm) | 6,300 | 10,000 | 13,800 | 18,800 |
| 094 (welding end ø 60.3 mm) | 9,450 | 15,000 | 20,700 | 28,200 |
| 150 (welding end ø 60.3 mm) | 13,230 | 21,000 | 28,980 | 39,480 |
| 175 (welding end ø 76.1 mm) | 17,640 | 28,000 | 38,640 | 52,640 |
| 200 (welding end ø 88.9 mm) | 25,200 | 40,000 | 55,200 | 75,200 |
| 240 (welding end ø 88.9 mm) | 37,800 | 60,000 | 82,800 | 112,800 |
Element, condensate drainage and maintenance
A PF range element is fitted in the housing — for example, the PFN25-010V for the WFIWN25-010. The same element also fits the PFN25-010, HPFN25-010, WFITN25-010, WFIFN25-010 and WHFITN25-010. Element working temperature +1.5 to +150 °C.
The filter is supplied with an element, without a condensate drain. For WFIW filters, the manufacturer offers the AOK20SS stainless steel float drain up to 20 bar and +65 °C and, for the head, the MDHI 50-K differential pressure gauge. The drain outlet in the bottom has a G 1/2" thread.
Replace the element at least once every 12 months. Once a year, also check the housing for visible damage.
Accessories for WFIWN25 filters
MDHI 50-K gauge
Differential pressure gauge with connecting tubes; it shows how clogged the element is.
The same stage in other ranges
Stage N25 also comes in the PFN25 filters up to 14 bar, HPFN25 filters up to 50 bar, WFITN25 filters up to 14 bar, WFIFN25 filters up to 14 bar and WHFITN25 filters up to 50 bar. The elements are the same for all ranges.
Ventilek’s tip
A coarse mesh protects the fine ones. When larger contaminants come loose in the air line, the N25 stainless steel mesh traps them, and the fine elements after it do not clog as quickly.
- What filtration rating does the WFIWN25 coarse filter have?
- The mesh traps particles larger than 25 µm. The manufacturer does not state an ISO 8573-1 class for it.
- Does it also trap oil?
- No. Oil aerosol is handled by the fine pre-filter M.
- When should the element be replaced?
- At least once every 12 months.
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With a ø 17.2 mm pipe connection and a flow of 1,250 l/min at 7 bar, the WFIWN25-005 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 21.3 mm pipe connection and a flow of 2,500 l/min at 7 bar, the WFIWN25-010 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 26.9 mm pipe connection and a flow of 3,750 l/min at 7 bar, the WFIWN25-018 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 33.7 mm pipe connection and a flow of 5,250 l/min at 7 bar, the WFIWN25-030 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 42.4 mm pipe connection and a flow of 7,000 l/min at 7 bar, the WFIWN25-047 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 48.3 mm pipe connection and a flow of 10,000 l/min at 7 bar, the WFIWN25-070 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 60.3 mm pipe connection and a flow of 15,000 l/min at 7 bar, the WFIWN25-094 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 60.3 mm pipe connection and a flow of 21,000 l/min at 7 bar, the WFIWN25-150 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 76.1 mm pipe connection and a flow of 28,000 l/min at 7 bar, the WFIWN25-175 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 88.9 mm pipe connection and a flow of 40,000 l/min at 7 bar, the WFIWN25-200 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...
With a ø 88.9 mm pipe connection and a flow of 60,000 l/min at 7 bar, the WFIWN25-240 coarse filter traps coarse solid contaminants larger than 25 µm and protects the finer...