As a result, material can be applied at a more rapid rate, saving time.
With a remote canister, HVLP spray gun  are much lighter and easier to maneuver in tight spaces.
The gun can be sprayed in any position including upside down.
A much larger material container can be used, reducing the need to interrupt production.
The main disadvantage of a pressure-feed system is the increase in clean-up time of the pot and fluid hose. A secondary disadvantage is the high equipment cost.

On siphon-feed guns the material container is located below the gun. Compressed air enters the inlet and moves through the gun to create a vacuum at the air cap. The lid has a vent hole to allow air to enter the cup. The difference in pressure between the air leaving the gun at the tip and the air entering the vent hole creates a siphon that draws material up the fluid tube. The material is then drawn through the fluid tip, where it mixes with air coming from the cap and is atomized.

Because some of the air entering the gun is needed to draw material to the fluid tip, and the siphon effect is not very powerful, these guns are not as efficient with heavier materials as other designs. Siphon-feed guns should be used with low- to medium-viscosity materials. This includes dyes, stains, lacquers, acrylics and enamels. Siphon-feed guns generally won't work with heavy material like latex. Another disadvantage is that the gun must be held fairly upright and is less than ideal in tight quarters due to the cup.

Gravity-Feed Spray Guns operate similar to a siphon-feed 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,vctfgvy3 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.WEB:http://www.chinapaintsprayer.net