Gravity-Feed Spray Guns operate similar to a
air spray gun except the material container is located above the gun. This allows gravity to assist the fluid when entering the gun, creating a positive fluid pressure. With a positive fluid pressure, air entering the gun can be better utilized for atomization rather than for siphoning paint from a container. This is particularly important when using reduced gun pressures such as those in HVLP equipment. Furthermore, the positive fluid pressure allows slightly heavier materials to be sprayed through gravity-feed guns.
Besides better performance, gravity-feed offers huge material cost savings over siphon-feed and pressure-feed guns. Gravity-feed guns allow almost all of the paint material to be used. Siphon and pressure-feed designs will always leave several ounces of paint at the bottom of their containers.
Finally, when paint runs out in
HVLP spray gun, there is no "sputtering" which often leads to refinish issues. For these reasons, gravity-feed guns have become the products of choice in the automotive refinishing industry.
