EN
77-1153-R25.1 (8/2014)
8 / 12
Length of Pipe (feet)
Air Flow
CFM
50 100 150 200
10
1/2” 3/4” 3/4”
20
3/4” 3/4” 3/4” 3/4”
30
3/4” 3/4” 1” 1”
40
1” 1” 1” 1”
50
1” 1” 1” 1”
70
1”
1” 1-1/4” 1-1/4”
AIR SUPPLY
The Clean Air™ filter should not be mounted on or
near the air compressor.
The temperature of air is greatly increased during compression. As the
air cools down to room temperature, in the air line, on its way to the
spray gun, the moisture contained in it condenses. Thus, for maximum
effectiveness, the oil and water extractor should be mounted at some
point in the air supply system where the temperature of the
compressed air in the line is likely to be lowest.
Air lines must be properly drained.
Pitch all air lines away from the compressor so that condensed moisture
can be drained off. Each low point in an air line acts as a water trap. Such
points should be fitted with an easily accessible drain. See diagram above.
PIPE SIZE, I.D. (inches)
Install
drain
at each
low point
Compressor unit
Drain
Pitch pipe away from air receiver
Oil and
water
extractor
Drain
25 FEET OR MORE
Oil and Water Extractor should be at least 25 ft. from the compressor. Further if possible.
Air pressure at the gun is important.
Atomizing pressure must be set to allow for the drop in air pressure
between the regulator and the spray gun.
A DeVilbiss Clean Air™ filter is important.
A Clean Air™ filter serves a double purpose. It
eliminates blistering and spotting by keeping air
free from oil and water... and its precision air
regulator makes possible perfect air pressure
control at the gun.
The best spray gun in the world will not operate
efficiently without a good compressor and a
Clean Air™ filter. Model HFRL-508 is recommended.
If you are attempting to get a fine finish without the use of a Clean Air™
filter you will not succeed.
Cross section view showing
comparison of inside hose
diameters (actual size).
60 lbs. regulated pressure
5/16”
1/4”
Only 44 PSI
25 feet of 1/4” I.D. hose causes a drop of 16 PSI
between the air supply and the gun.
Only 55 PSI
25 feet of 5/16” I.D. hose has a drop of only 5 PSI.
For this reason we recommend the use of 5/16” hose.
AIR PRESSURE
