V-0.25/8 Air Filter with 1/2″ Thread for V-0.25 and W-0.36 Piston Compressors
The V-0.25/8 is a complete intake air filter with a threaded housing and filter element. It is installed at the cylinder-head intake and removes dust, mechanical particles and abrasive contaminants from atmospheric air before it enters the cylinder.
1. Purpose and operating principle
Clean intake air protects valves, piston rings and cylinder walls against abrasive wear, helps maintain rated output and extends compressor service life. This is a dry filter with no oil impregnation.
The filter is intended for V-0.25/8 and W-0.36/8 compressors. Compatibility with other models must be checked against the thread and cylinder-head dimensions.
2. Technical specifications
| Parameter | Value |
|---|---|
| Model | V-0.25/8 (compatible with W-0.36/8) |
| Type | Complete dry intake air filter |
| Thread | 1/2″ |
| Filter element | Synthetic material and cellulose |
| Filtration rating | 5–10 μm |
| Indicative replacement interval | 300–500 operating hours |
| Quantity per compressor | Usually 2 units (one per cylinder) |
Confirm these details with the supplier or using a sample. The product page gives approximate dimensions of 53–70 mm diameter and 70–80 mm height; the housing material is described as “plastic / metal.” Confirm the exact housing material, outside diameter and height, thread diameter and length, thread type (G/BSPP or R/BSPT), cartridge dimensions, brand and part number. Also confirm the number of filters required for the W-0.36: W-type heads usually have three cylinders, while the page indicates two filters. Check the exact filtration rating and replacement interval in the compressor manual.
3. Design features
| Compressor designation | Meaning |
|---|---|
| V | V-type head, usually with two cylinders — confirm |
| 0.25 | 0.25 m³/min air delivery according to common notation — confirm |
| /8 | 8 bar operating pressure according to common notation — confirm |
- Housing with a 1/2″ threaded connection that screws into the cylinder-head intake port.
- Filter element made of synthetic material and cellulose.
- Dry design with no oil impregnation.
- V-type heads usually use one filter per cylinder; confirm the arrangement for your model.
4. Installation recommendations
- Stop the compressor, disconnect the power supply and release pressure from the receiver.
- Check the 1/2″ thread type. BSPP (G, parallel) should be sealed at the face with a washer or gasket, not PTFE tape. BSPT (R, tapered) is sealed with PTFE tape.
- Clean the intake port and check the thread for damage.
- Tighten by hand, without a wrench; the housing may crack.
- Install all filters required for the specific compressor.
- Replace the assembly if the housing is cracked or the element is torn.
- Do not wash or blow out a disposable filter element with compressed air.
- After installation, check for unusual noises or air leaks.
- Indicative replacement interval: 300–500 operating hours; replace more often in dusty environments. Check the manual.
- If the housing is intact, replacing only the cartridge may be possible. A D 65 mm, H 35 mm cartridge for V-0.25/W-0.36 is listed on the website; confirm that it fits this housing.
5. Alternatives and comparison
No direct-equivalent part numbers have been verified. Compatibility with brands such as Strom, Extel and Well Kraft is not confirmed. When selecting a replacement, check thread size, type (G/R) and length, housing diameter and height, cylinder count and cartridge dimensions.
| Product | Dimensions | Application |
|---|---|---|
| V-0.25/8 air filter (this product) | 1/2″ thread; dimensions to be confirmed | V-0.25/8, W-0.36/8 |
| Air-filter cartridge D 65 × H 35 mm | D 65 mm, H 35 mm | V-0.25/W-0.36; cartridge only |
| Air-filter cartridge Ø95 × 50 mm | Ø95 mm, H 50 mm | V-0.6, W-0.9 |
| Air-filter cartridge Ø68 / Ø36 × 127 mm | 68 mm OD, 36 mm ID, H 127 mm | 2080, 2090 |
| Complete plastic air filter | 90 mm OD, 1/2″ thread (20 mm) | See the FL-24 product page |
Filters for different compressor models are not necessarily interchangeable. For reliable identification, send a photo of the old filter and the compressor nameplate.
6. Common mistakes
- Choosing by the 1/2″ thread alone; housing dimensions and thread type must also match.
- Installing the wrong number of filters.
- Tightening a plastic housing with a wrench and cracking it.
- Using PTFE tape on a parallel G thread.
- Washing or blowing out the filter element.
- Operating the compressor without a filter.
- Replacing only some of the filters.
- Buying a “universal” filter without checking dimensions.
7. Applications
- Repair and maintenance of V-0.25/8 and W-0.36/8 piston compressors.
- Workshops, automotive service centres, tyre shops and garages.
- Woodworking, furniture manufacturing and construction work.
- Small production facilities using pneumatic tools and home workshops.
8. Expert opinion
“The air filter is one of the least expensive spare parts, but it has a major effect on cylinder-head service life: dust passing through a worn filter damages valves and piston rings. Replace it regularly, and more often if the workshop is dusty. Before ordering, check the compressor model, thread and number of filters. Fit the housing by hand without a wrench. If you are unsure, send us a photo of the old filter.”
Vitalii Boluchevski, Acvatron SRL — 18 years of experience
9. Frequently asked questions (FAQ)
How often should the filter be replaced? The indicative interval is 300–500 operating hours or every 6–12 months. In dusty conditions, replace it approximately every 200–300 hours. Check the compressor manual.
How many filters are required? A V-type head usually has one filter per cylinder, meaning two. W-type heads usually have three cylinders; confirm the quantity for your model.
Is it suitable only for the V-0.25/8? It is intended for V-0.25/8 and W-0.36/8. For other compressors, check the thread and dimensions.
Can I replace only the cartridge? If the housing is intact, this may be possible. The D 65 × H 35 mm cartridge listed for V-0.25/W-0.36 must be checked for fit in this housing.
How do I identify the thread type? G (BSPP) is parallel and seals at the face; R (BSPT) is tapered and sealed with PTFE tape. If unsure, send a photo of the old filter.
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