Similar to air spray gun in that it uses pneumatic fluid atomization except HVLP uses a higher volume of air at a lower pressure. The lower pneumatic pressure allows for less overspray. HVLP spray guns are commonly used in the automotive, general metal, aerospace, architectural coating, furniture finishing, and other fine finishing applications where material waste is of a great concern. HVLP spray guns are often required by U.S. Enviromental Agencies for high usage customers. HVLP spray guns come in a variety configurations; siphon feed, gravity feed, and pressure feed.
Advantages: High transfer efficiency (65% to 75%). Sprays well into recesses and cavities.
Limitations: Uses a high volume of air. Atomization not as fine as air spray guns.
HVLP, or High-Volume/Low Pressure, uses a high volume of air (typically between 10-26 CFM) delivered at low pressure (10 PSI or less at the air cap) to atomize paint into a soft, low-velocity pattern of particles. In many cases, less than 10 psi is needed in order to atomize. Proper setup utilizes no more fluid and air pressure than is needed to produce the required quality and a flow rate that will meet production requirements. As a result, far less material is lost in overspray, bounceback and blowback than with conventional air spray. This is why HVLP delivers dramatically higher transfer efficiency (the amount of paint that adheres to the substrate compared to the amount of paint sprayed) than spray systems using a higher atomizing pressure. The HVLP spray gun resembles a standard spray gun in shape and operation. HVLP is growing in popularity and new environmental regulations are requiring it for many applications. HVLP can be used with a wide variety of materials, including two-component paints, urethanes, acrylics, epoxies, enamels, lacquers, stains, primers, etc.