Practical Guide
WIWA Professional Classic: High-Pressure Airless for Heavy Corrosion Protection (Model 24071)
When you process high-viscosity, low-solvent, or solvent-free coating materials with high solid content, one thing matters most: stable pressure, large nozzles, and long material hoses without a drop in area performance. This is exactly what the WIWA Professional Classic is designed for.
Quick Check: Is the Professional Classic right for your material?
- You need high spray pressures and want to work stably even with larger nozzle bores.
- You spray thick-film systems (e.g., corrosion protection, glass flake, bitumen, PFP/fire protection materials).
- You plan to use long material hoses or work several meters away from the surface.
- Important: The Classic series is made of carbon steel – for water-based materials, a stainless steel/GX alternative is typically recommended.
KPI
460 bar
Max. operating pressure (Model 24071) – ideal for heavy corrosion protection systems.
KPI
up to 44 l/min
Max. flow rate (Model 44032) – when area performance is the priority.
KPI
71:1
Pressure ratio (Model 24071) – powerful for high-viscosity materials.
Product Overview: Variants & Applications (Quick & Clear)
| Model | Strength | Pressure Ratio | Max. Op. Pressure | Max. Flow Rate | Versions |
|---|---|---|---|---|---|
| 24071 | High viscosity, long hoses, high pressures | 71:1 | 460 bar | 24 l/min | Cart / Lift Truck / Wall Mount |
| 28064 | Compromise between pressure & output | 64:1 | 450 bar | 28 l/min | Cart / Lift Truck / Wall Mount |
| 44032 | Maximum area performance at moderate pressure | 32:1 | 255 bar | 44 l/min | Cart / Lift Truck / Wall Mount |
Practical Tip: If you plan to use larger nozzles and long hoses, 24071/28064 is often the first choice – this is exactly what the series is designed for.
Field Tip: For tough corrosion protection systems, it is better to start with a conservative nozzle size and
gradually increase the pressure until the spray pattern "stands" cleanly. This avoids unnecessary pulsation, paint mist, and early filter clogging –
and helps you find the stable window for your hose length faster.
Recommended Basic Settings (Guidelines)
The following values are guidelines and must always be adjusted to the material, temperature, hose length, and nozzle. Use them as a starting point – then fine-tune.
| Parameter | Starting Value (Guideline) | Why / What to watch for |
|---|---|---|
| Air Inlet Pressure | 4.5–6.0 bar | Increase until the spray is clean. Maximum values are model-dependent (24071 up to 6.5 bar). |
| Spray Pressure at Gun | 120–200 bar | Many applications deliver very good surfaces in the 50–250 bar range – optimize within this window. |
| Nozzle (Starting point) | 0.33 mm / 40°–65° | A robust starting point (accessory/standard nozzles). For thicker systems, use larger if necessary – then keep an eye on pressure & filter. |
| Hose Setup | As short as possible | Every meter costs pressure reserve. For long distances, adjust gradually (pressure/nozzle). |
Professional Workflow (5–7 Steps)
- Check Material: Assess viscosity/temperature, prepare the container cleanly, prepare sieve/suction.
- Define Filter & Nozzle: Start with a proven nozzle (e.g., 0.33 mm) and a clean high-pressure filter.
- Start with Low Air Pressure: Start the system, increase pressure slowly until the fan is stable.
- Optimize Spray Pattern: Test edges/overlap, adjust distance & speed.
- Ensure Consistency: Re-check after 3–5 minutes (filter load/temperature drift) and fine-tune.
- Pause Strategy: Organize short stops so that material does not sit unnecessarily in the nozzle/filter (depending on material).
- End & Cleaning: Release pressure, check filter/nozzle, clean and preserve the system according to material requirements.
Troubleshooting: 4 Typical Problems (with Actions)
1) Pulsating spray / Pressure fluctuates
- Increase or stabilize air inlet pressure slightly (check regulator/compressor output).
- Try a nozzle one size smaller (reduces material throughput demand).
- Clean/check the high-pressure filter – a clogged filter creates pressure spikes.
2) Too much overspray / "Mist"
- Reduce spray pressure until the fan just barely stays clean.
- Reduce spray distance and guide more evenly (keep overlap clean).
- Adjust spray angle/nozzle to the component geometry.
3) "Spitting" / Uneven application
- Clean the nozzle and nozzle seat; replace if damaged.
- Check material suction for air intake (seals/connections).
- Stabilize material temperature (tough systems react strongly to cold).
4) Throughput drops (especially with long hoses)
- Check hose length/cross-section; shorten or adjust cross-section if possible.
- Choose a slightly smaller nozzle or create pressure reserve (model dependent).
- Check filter/suction – high viscosity clogs filters faster.
Maintenance (5 points, quick & effective)
- Open & clean the high-pressure filter regularly (clean filter = smooth spray).
- Monitor release agent/lubrication chamber: Check fill level, keep clean – protects packings and piston rod.
- Check seals/union nuts: Tighten/replace in time before air is drawn in.
- Keep material paths clean: Short cleaning routines prevent "sticking" and save time on the next job.
- Stock wear parts as a set: Nozzle, filter element/gap filter, relevant seals – to avoid downtime.
Video: Professional Classic in Action
FAQ (Practical)
Which Classic variant is the "safe bet" for high-viscosity corrosion protection materials?
In the Classic series, 24071 and 28064 are specifically designed for high-viscosity, low-solvent/solvent-free materials with high solid content – ideal for long hoses and large nozzles.
Can I spray water-based materials with the Professional Classic?
The Classic series is described as a carbon steel version. For water-based materials, a suitable stainless steel/GX variant is typically recommended.
What does a high pressure ratio (e.g., 71:1) give me?
You get more pressure reserve for tough material, long hoses, and larger nozzles – this helps keep the fan stable and builds up coat thickness reliably.
What starting values will help me find a clean spray pattern quickly?
Start with a moderate nozzle (e.g., 0.33 mm) and medium pressure, then increase in small steps until the fan stands clean. Maximum values depend on the model.
Which component causes the most downtime in practice?
In many setups, it is a clogged filter or a worn nozzle. Anyone who checks filters/nozzles regularly and keeps replacements on hand will notice a significant reduction in downtime.
CTA: Which version fits your application?
Choose the right Model 24071 version now – mobile on a cart, flexible on a lift truck, or stationary on a wall mount.
Note: Technical data and guidelines are application-dependent. Check the material data sheet, job site conditions, and safety requirements before finalizing parameters.
