DeVilbiss AG361 Automatic Gun – Settings, Air Caps & Nozzle Selection in Practice
The DeVilbiss AG361 is a Low-Pressure Air Atomization automatic spray gun for industrial coatings – suitable for water-borne and solvent-based materials. In this guide, we show you how to optimally set up HVLP and Trans-Tech variants, combine the right nozzle/air cap, and safely troubleshoot typical spray patterns.
Product Overview AG361
| Feature | Specification (Guide values according to Service Manual) |
|---|---|
| Max. Air Inlet Pressure | up to 7 bar |
| Cylinder Air Pressure | approx. 4–7 bar (model dependent) |
| Weight | approx. 670 g |
| Materials | Stainless steel fluid passages, QuickClean™ coated aluminum housing |
| Application Areas | Industrial coating, fine finishing, water-borne & solvent-based |
HVLP & Trans-Tech variants achieve > 65% transfer rate (manufacturer's specification).
Recommended: approx. 150–200 mm.
Conventional, Trans-Tech, HVLP – depending on material & target surface.
Recommended Basic Settings (Guide Values)
- Trans-Tech Air Caps: approx. 2.0 bar inlet pressure
- Conventional Air Caps: approx. 3.0 bar inlet pressure
- HVLP (HV30): approx. 1.75 bar inlet pressure (approx. 0.7 bar at the cap)
- Spray Distance: 150–200 mm
- Fine-tune fluid volume via needle adjustment
Values depend on material, viscosity, and chosen nozzle size. Data provided as guide values according to performance tables.
Pro Workflow for Stable Processes
- Open needle adjustment completely.
- Open FAN and ATOM valves completely.
- Set fluid pressure according to the desired flow rate.
- Set air inlet pressure to the guide value while the gun is triggered.
- Spray a test pattern – adjust air or material if necessary.
- Fine-tune via needle and pattern width.
- After operation: Close air & material, relieve pressure, clean.
Typical Spray Patterns & Solutions
- Heavy edge left/right: Clean air cap, check horn holes.
- Heavy center point: Reduce material volume or increase air pressure.
- Split spray: Too much horn air – reduce pattern control valve.
- Spitting at start: Check nozzle/needle, inspect seat.
Maintenance Recommendations
- Daily cleaning of air cap and nozzle.
- Regularly check nozzle seat and needle for wear.
- Inspect seals/O-rings.
- Use only suitable solvents.
- Relieve pressure completely before maintenance.
FAQ for the AG361
1. Which nozzle size for 2K paint?
Typically 1.2–1.4 mm – depending on viscosity.
2. Difference between HVLP vs. Trans-Tech?
HVLP with lower cap pressure, Trans-Tech with higher energy efficiency.
3. Recommended spray distance?
150–200 mm.
4. Why is a fluttering spray pattern occurring?
Check for a loose nozzle or clogged fluid passage.
5. Is the gun ATEX compliant?
Suitable for Zones 1 & 2 (II 2 G X T6 according to manufacturer specification).
Conclusion: With the right combination of air cap, nozzle set, and precise pressure adjustment, the AG361 offers a stable, efficient solution for industrial coating processes. Crucial factors include reproducible starting values, clean components, and systematic fine-tuning.
