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Airspray
How do I find the right nozzle size for my Airspray/HVLP spray gun?
Selecting the nozzle size for the Airspray/HVLP spray gun is very important for the painter.
Selecting the nozzle size and air cap is often a laborious process. The following article is intended to help you find the right nozzle size for a low-pressure spray gun.
The choice of the right nozzle depends on the flow rate and the pressure used. The material is also of great importance.
Choose the perfect nozzle opening depending on the colour to be sprayed. Below you will find a reference table that you can use to determine the nozzle openings we recommend for paints and colours. The size also depends, of course, on the preferences of the painter:
- 2K paints: 1.3 to 1.4
- Base coats: 1.2 to 1.4
- primers: 1.5 to 2.0
- Spray putties: 2.5 to 3.0
- Water-based paints: 1.3 to 1.4
In addition, the application can be used to determine the recommended nozzle size.
| Surface | Application areas | material flow ml/mm | Flow cup nozzle in mm |
|---|---|---|---|
| small | Adhesive | 10 - 100 | 0.7 - 1.0 |
| small / medium | industrial painting | 150 - 250 | 1.4 - 1.8 |
| medium | wood, wooden furniture | 200 - 300 | 1.4 - 1.8 |
| large | commercial vehicles | 300 - 450 | 1.8 - 2.0 |
This table is based on empirical values and should be seen as a recommendation. The data is determined during the 15 to 25-second test phase. In practice, these parameters also depend on the quantity and consumption of the materials. Therefore, it can be assumed that the nozzle size increases with increasing viscosity. All nozzle sizes shown are suitable for all spray guns.
If you have any questions, please contact our beschicht. team and we will be happy to help you choose the right nozzle size.
How do I find the right air cap for my spray gun?
The right choice of air cap is very important for the spray gun and the spray pattern.
In summary, there are three different air caps, as shown in the following table.
| Designation Manufacturer | Air cap internal pressure | air cap volume | Spray quality | material transfer | |
|---|---|---|---|---|---|
| conventional | high 3 - 8 bar | low > 350 l/min | very good | <65% | |
| Medium pressure | HVLP Plus, RP, Transtec | medium 1.3 bar | low approx. 280 l/min | very good | 65% - 75% |
| low pressure | HVLP | low 0.7 bar | high approx. 460l/min | good | 65% - 75% |
The name of the HVLP Plus system is Transtec at DeVilbiss and RP at SATA. Basically, this is a further developed technology between conventional spraying and HVLP application.
The advantages of this advanced HVLP Plus technology for spray guns are, in particular, the following:
- a reduction in the amount of paint and solvent used and the associated savings
- Improvement of working conditions
- Better transfer efficiency with at least 65% and less maintenance work, e.g. on the extraction filter
In combination with the right spray nozzle and the selected matching air cap, you can achieve the desired painting result. Contact our Beschicht team for application advice.
HVLP stands for high volume low pressure. This means that HVLP spray guns work with a lot of air and little pressure. In this process, the paint is atomised at the air cap of the spray gun with a maximum of 0.7 bar internal nozzle pressure. This means that HVLP spray guns produce less overspray and the spray pattern is significantly improved. If there is too much overspray from spray guns, the spray pattern can deteriorate significantly.
The advantages of the HVLP method over conventional spray methods are that it is more environmentally friendly and cost-effective, as less paint ends up in the environment and in the air. The material application efficiency with HVLP spray guns is significantly higher as a result. The air volume required for the HVLP spray guns is between 600 and 2000 NI/min.
The disadvantage of HVLP technology is that the spray gun must be held close to the workpiece to be coated and the area performance is relatively low. This has led to the development of the HVLP Plus process, which is an improvement on the existing HVLP technology.
The advantage of this further development of HVLP technology is an even higher transfer efficiency. This means material savings and reduced air consumption. The HVLP Plus technology also results in an even better surface quality. The internal nozzle pressure at the air cap of the spray gun is approx. 1.3 bar. All beschicht. spray guns M1 G, M1 P and A1 are available with an HVLP plus air cap.
In addition to the two methods mentioned, HVLP and HVLP Plus, there is also the conventional method, in which the material is atomised at the air cap of the spray gun at a pressure of 2.5 bar to 4 bar. The air inlet pressure used at the spray gun is between 2.5 and 5 bar for the conventional spraying method. Due to the very high pressure, a very fine atomisation is achieved, but with a lot of paint mist and high material consumption.
DeVilbiss spray guns
DeVilbiss is a manufacturer of manual and automatic low pressure spray guns and associated painting accessories, including gun filters and air regulators, respirator masks, spray gun cups, hoses and other equipment for industrial painters. DeVilbiss is known for the development and introduction of the first "TransTech" spray guns, which greatly reduce overspray and VOC emissions. At the same time, DeVilbiss spray guns set standards in ergonomics and innovative design.
DeVilbiss spray guns are particularly environmentally friendly. With the introduction of the first "Compliant" spray guns, DeVilbiss ensured a significant reduction in overspray and thus in volatile organic compounds. Our modern TRANS-TECH© atomisation technology is a groundbreaking combination of conventional and HVLP atomisation methods and offers the best painting quality and significantly reduced environmental pollution.
DeVilbiss is a world leader in spray gun and air cap design. Since its foundation, the company has perfected groundbreaking innovations in atomisation technology to ensure the highest possible standards of paint application and surface quality, regardless of the application. The current range of manual and automatic spray guns is testament to the company's constant pursuit of excellence, ensuring that it continues to meet the high demands of its customers and maintains its leading position in the global market.
SATA spray guns
A SATA spray gun enables you to achieve perfect painting results thanks to its unique precision and the highest quality. Choose the appropriate spray technology for your SATA spray gun based on your personal requirements. Our spray guns are available as RP and HVLP spray guns. All paint spray guns and spray guns are produced exclusively in Germany and sold worldwide.
SATA GmbH & Co. KG is a global leader in the field of liquid painting technologies and liquid paint application, and in addition to Germany, supplies sales partners in around 100 countries worldwide. In addition to SATA's technologically outstanding spray guns, other products such as cup systems, breathing protection systems and compressed air technology make SATA a system provider for users such as vehicle painters.
SATA gravity spray guns: When you choose SATA gravity spray guns, you are choosing a top-quality paint spray gun. SATA's high-precision technology provides you with an extremely durable tool that helps you to professionally apply a wide range of paints and lacquers.
