How Do HVLP Gravity Feed Spray Guns Work?

the way hvlp sprayer paints

Photo by Photocapy

Spray guns can be used to paint your house, a wall or for car painting among many other things. In this article, we will talk about which type of spray gun to use for the automotive industry and then discuss in detail how the different types of spray guns work.

If you are just going to paint your car once, then you are better off going to the body shop and getting a professional to do it for you. You should only buy a spray gun for automotive purposes if you are planning to do quite a few car paint jobs because a decent professional paint sprayer can cost you up to $500.

Consider Efficiency And Safety

The best paint sprayer for beginners is the high volume low pressure ones, also called HVLP paint sprayers. It is very efficient and causes less overspray compared to other paint sprayers and therefore it is less harmful to the environment and to your health.

There are different kinds of HVLP sprayers and in order to compare them we need to talk a little bit more about how spray guns work. Spray guns use a process called atomization to spray paint onto the painting surface.

This process uses force to convert a liquid source into fine spray particles. The force used can be from any source such as electrostatic force, compressed air or a pump. Conventional spray guns use compressed air to atomize paint.

How Does A Paint Sprayer Operate?

The spray gun has two main sources of air, one which helps to form the pattern on the spray painting surface and one that breaks up the fluid stream into the fine spray particles. Both of these air sources are located in air caps at the exit of the spray gun’s nozzle.

The paint is delivered by means of a cup which is attached directly to the spray gun. There are three different kinds of HVLP spray guns, gravity feed, pressure feed, and siphon feed.

The siphon feed spray gun uses pressurized air to create a siphoning action at the nozzle. The siphon feed spray gun has the paint cup located below the nozzle.

Due to the difference in atmospheric pressure, the paint then moves towards the vacuum area and comes out of the cup. The atomized air pressure determines how much fluid is sprayed by the paint sprayer.

If you want fast application then you are looking for a spray gun with a higher atomized air pressure. However, higher atomized air also means more overspray. The siphon feed spray gun is not efficient because it does not give you enough control of the atomized air pressure and therefore you cannot control the amount of paint being sprayed.

How To Get Control Of The Flow Of Paint?

On the other hand, HVLP gravity feed spray guns have the paint cup located above the nozzle. As the name suggests, with this type of spray gun, gravitational force is used to push the fluid out of the nozzle.

What this means is the fact that less atomization of air is required for spraying. There is no splatter when there is no more paint in the cup with gravity feed spray guns.

They just stop spraying whereas with this siphon feed guns, spitting of paint occurs. With the gravity feed spray guns, the flow of paint is dependent on various things such as the size of the nozzle, how fluid the paint is, and also by the atomization of air.

Pressure feed spray guns are the most popular because with them, you can control the flow of paint easily by controlling the atomization of air. This can be controlled via a regulator or a valve.

The pressure feed spray guns are now being used instead of the siphon feed spray guns because they also tend to have more power and can spray thicker coatings. The pressure feed spray guns also allows spraying from any angle which is not the case with the siphon feed and gravity feed spray guns because the flow of the paint can go wrong really easily.

Gravity Feed Versus Siphon Feed Sprayers

However, if you had to choose between the gravity feed and siphon feed spray guns, then the gravity feed spray gun is the best one because it is less dependent on the air pressure and it uses almost all the paint in the spray process with no wastage. The design of the gravity feed spray gun also makes it easier to maneuver in tight places when compared to the siphon feed spray guns.

This article has given an overview of the different types of spray guns available and how they work. We have also pointed out the benefits and drawbacks of each type of spray gun. You should now have enough information to decide for yourself which one will suit you best.

One other thing to bear in mind before buying a spray gun is your budget and also how frequently you are going to use it. If you cannot afford a decent professional spray gun and will only use it a couple of times, then you are probably better off employing a professional contractor to do the job for you.



How Do HVLP Gravity Feed Spray Guns Work? was last modified: March 15th, 2015 by Jim Cross