For (None Digital) gravity fed spray guns a gauge control is used to regulate the amount of air,
enabling an accurate predictable atomisation (mix of air and paint). Works in combination with spray fan pattern size control (knob adjustment). This means you can work slowly with a small fan or faster with a larger fan.
Air control is usually in conjunction with wall filter regulators.
Can I use a spray gun (paint sprayer) with my compressor?
Yes, but the compressor size and it’s CFM (Free Air) is what matters.
Large compressor = many spray gun options
Small compressor = mini/midi spray guns.
A 24 litre compressor is suitable for *low free air spray guns or airbrushes* ( < 4.5 cfm).
A 50 Litre compressor would be suitable for most smart repair mini midi spray applications.
A typical full sized spray gun would require a larger compressor > 50 litre.
What compressor do I need to paint a car. How to choose the correct air compressor for my spray gun (paint sprayer)?
Connect the compressor and wait for full working pressure. you can then adjust the pressure via a gun gauge which is connected to your spray gun.
Compressors are measured by their displacement in CFM (Cubic Feet per Minute). Spray guns are measured by the free air they use, the maths is for example a 12cfm displacement less a third equals the free air available.
The simple sum is (12cfm displacement minus 1/3 = 8cfm free air).
How to use a spray gun with an air compressor?
A spray gun that is driven by compressed air must be connected via an airline; it can be directly screwed to a threaded airline but is usually used with quick release connectors.
What connectors do I need to connect my spray gun to air hose and compressor?
What airline and connectors do I need for my spray gun?
Typically 3/8” (8mm) is the minimum airline internal diameter/bore. We recommend using pre-made airline that includes ¼” BSP female threaded nuts at either end.
Quick release connectors screw in to the end of the airline primarily to pair/interconnect with a tail-piece. The spray gun tail-piece would have a female thread.
Male and Female thread (originates from the animal kingdom).
Example: ¼” BSP male thread screws into ¼” BSP female thread and forms a seal. Spray guns and fittings supplied by us in BSP >> with NPT >>
Quick release coupling connectors tube type tails that push in to small barrel like receivers (sometimes confused or described as male and female BUT not in SprayGunsDirect language).
Euro (HVLP) high flow connectors are best practice for use with a spray gun. Traditional / old-fashioned British connectors (often misleadingly referred to as PCL style) do not suit optimal air delivery for a spray gun.
Below shows HVLP connectors used to connect the spray gun to air hose and then to the compressor. This method is quick release which is simple and very easy to use especially when changing devices using compressed air. For a full compressed air system a second air hose would be included along with a filter regulator. Air flow would typicaly follow this direction.
Compressor >> Air Hose >> Filter Regulator (1,2 or 3 stage) >> Air Hose >> Spray Gun Gauge (non-digital) >> Spray Gun
HVLP Explained
High Volume Low Pressure has no restrictions on airflow with a wider male and female connection. This is the choice for most professional paint sprayers.
PCL Explained
PCL Connectors are usually used for air tools such as sanders, polishers, drills and grinders as 100% air flow can differ. The below image shows the Prevost Flexair 10m Hose *British Style PCL Connector* with Prevost Air Blow Gun.
Above image shows (compressor connectors)
Prevost Flexair 20m Hose (Male) connecting to a Female HVLP Coupling/Receiver
Below & bottom right image shows the Prevost ESI 07 (female) HVLP quick connector with DeVilbiss MPV-5 (male) tailpiece. This is connected to the spray gun gauge and spray gun.
With air filtration down to 0.01 microns and activated carbon removing contaminants and odours down to 0.003 ppm for both breathing and spraying. Compressed air filtration is designed to remove liquid, oil and water from flowing compressed air.
For working spray booths filters should be replaced every 3 months.
You must install a wall mounted filter regulator to remove water and oil otherwise paint defects e.g. craters emerge.
A simple solution is to run a 10-metre airline from the compressor to the wall filter then add another line to the outlet to run to the spray gun.
See figure 1.0 (part no. AH117317 for filtration) – showing a typical compressed air configuration.
What filter regulator do I need?
Single stage brings the air down to 0.5 microns which is clean enough to spray with.
Two stage 0.01 micron and greater capacity for long life span. Sufficient for 1-man air fed mask.
Three stage for minimal contaminants including odour; so the ultimate for air fed mask operation.
