Suction Vs. HVLP
Choose the correct type of equipment for the job. In this case, we’re talking about the traditional suction-feed high-pressure, or the more modern high-volume low-pressure (HVLP) type of gun. OK, so what’s the difference and what would be the advantage of one over another you may ask? HVLP spray guns were designed to reduce overspray and get more material to the surface and less into the air as overspray. There is an internal restrictor inside of an HVLP gun, which restricts the incoming air pressure in order to provide a reduced air pressure at the air cap. This differs from a conventional gun. A conventional gun does not have an internal restrictor and, therefore, whatever the inlet pressure is set at, the air cap pressure will be the same. With an HVLP gun you don’t have clouds of noxious paint fumes filling the air (or garage), but they use a large volume of air compared to a standard suction-type gun—making compressor capacity a deciding factor.