WFIWI20 sintered stainless steel pre-filters up to 14 bar
The WFIWI20 sintered pre-filter has an element made of sintered stainless steel 1.4404 and traps solid particles larger than 20 µm. It goes at the start of the filtration in the WFIW range: it protects the finer stages after it.
The WFIWI20 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.
WFIWI20 filters by size
The size determines the connection and the flow. Each size has its own PF range spare element.
| WFIWI20 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 |
| WFIWI20-005 | welding end ø 17.2 mm | 1,250 | 75 | 202 × 76.1 mm | 1.8 kg | PFI20-005V |
| WFIWI20-010 | welding end ø 21.3 mm | 2,500 | 150 | 240 × 76.1 mm | 2 kg | PFI20-010V |
| WFIWI20-018 | welding end ø 26.9 mm | 3,750 | 225 | 254 × 76.1 mm | 2 kg | PFI20-018V |
| WFIWI20-030 | welding end ø 33.7 mm | 5,250 | 315 | 280 × 88.9 mm | 3 kg | PFI20-030V |
| WFIWI20-047 | welding end ø 42.4 mm | 7,000 | 420 | 337 × 88.9 mm | 3 kg | PFI20-047V |
| WFIWI20-070 | welding end ø 48.3 mm | 10,000 | 600 | 376 × 114.3 mm | 4.3 kg | PFI20-070V |
| WFIWI20-094 | welding end ø 60.3 mm | 15,000 | 900 | 457 × 114.3 mm | 4.8 kg | PFI20-094V |
| WFIWI20-150 | welding end ø 60.3 mm | 21,000 | 1,260 | 583 × 114.3 mm | 5.3 kg | PFI20-150V |
| WFIWI20-175 | welding end ø 76.1 mm | 28,000 | 1,680 | 740 × 139.7 mm | 9 kg | PFI20-175V |
| WFIWI20-200 | welding end ø 88.9 mm | 40,000 | 2,400 | 1,004 × 139.7 mm | 10.8 kg | PFI20-200V |
| WFIWI20-240 | welding end ø 88.9 mm | 60,000 | 3,600 | 1,029 × 168.3 mm | 16.2 kg | PFI20-240V |
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 20 µm sintered pre-filter is suitable at the start of the filtration. The element is made entirely of stainless steel and, like the housing, withstands up to +150 °C. It does not trap oil; the manufacturer does not state an ISO 8573-1 class for it.
Where to place it
At the start of the filtration or after the WFIWN25 coarse filter, before the WFIWN5 basic filter or the WFIWM fine pre-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.
| WFIWI20 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 PFI20-010V for the WFIWI20-010. The same element also fits the PFI20-010, HPFI20-010, WFITI20-010, WFIFI20-010 and WHFITI20-010. 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 WFIWI20 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 I20 also comes in the PFI20 filters up to 14 bar, HPFI20 filters up to 50 bar, WFITI20 filters up to 14 bar, WFIFI20 filters up to 14 bar and WHFITI20 filters up to 50 bar. The elements are the same for all ranges.
Ventilek’s tip
Coarse contaminants first. The sintered pre-filter I20 traps larger particles before they reach the fine pre-filter, whose element then lasts longer.
- What filtration rating does the WFIWI20 pre-filter have?
- The element traps particles larger than 20 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 WFIWI20-005 sintered pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 21.3 mm pipe connection and a flow of 2,500 l/min at 7 bar, the WFIWI20-010 sintered pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 26.9 mm pipe connection and a flow of 3,750 l/min at 7 bar, the WFIWI20-018 sintered pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 33.7 mm pipe connection and a flow of 5,250 l/min at 7 bar, the WFIWI20-030 sintered pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 42.4 mm pipe connection and a flow of 7,000 l/min at 7 bar, the WFIWI20-047 sintered pre-filter traps solid contaminants larger than 20 µm and protects the finer stages...
With a ø 48.3 mm pipe connection and a flow of 10,000 l/min at 7 bar, the WFIWI20-070 sintered pre-filter traps solid contaminants larger than 20 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 WFIWI20-094 sintered pre-filter traps solid contaminants larger than 20 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 WFIWI20-150 sintered pre-filter traps solid contaminants larger than 20 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 WFIWI20-175 sintered pre-filter traps solid contaminants larger than 20 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 WFIWI20-200 sintered pre-filter traps solid contaminants larger than 20 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 WFIWI20-240 sintered pre-filter traps solid contaminants larger than 20 µm and protects the finer...