High volume low pressure

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High Volume Low Pressure (HVLP, German: high air volume, low pressure ) is an internationally recognized low pressure process in painting technology .

When painting with HVLP paint spray guns (also NR , reduced fog), the spray material is atomized with a low internal nozzle pressure of maximum 0.7  bar . A material transfer rate of well over 65% is achieved here. Paint spray guns with HVLP technology have been mandatory in California since 1988 for environmental reasons (Rule 1151). The aim of this law is to reduce volatile organic compounds (VOC), as these damage the ozone layer . The HVLP technology enables a high material transfer rate through a lower internal nozzle pressure of max. 0.7  bar or 70 k Pa (≈ 10.15  psi ).

In order to produce an acceptable painting result when painting with HVLP spray guns, a higher volume of air is required for atomizing the spray material than with high-pressure guns. The required air volume of approx. 600–2000 Nl / min can be generated either by a turbine or by a compressor .

The advantage of HVLP technology is the high material transfer. The paint is applied in a more concentrated manner to the workpiece to be painted , there is less overspray (spray mist) and the loss of material is therefore reduced. HVLP painting is particularly suitable for thin materials with low viscosity . Even if more compressed air is used when painting with HVLP spray guns, the savings in the required paint outweigh the costs for the higher air consumption.

So-called Compliant guns are usually better suited for hobby painters or smaller companies that only have a small compressor.

See also

swell