Reply by EarlS

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Posted on Air Compressor filter/regulator & LVLP setup

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4017 posts in 3236 days

#1 posted 02-21-2017 06:20 PM

Keep your regulator and filter as close to the point of use as possible. There are a couple of reasons for this.

First, the same amount of air (weight) at a higher pressure air occupies less volume than it would at a lower pressure (remember PV= nRT from HS chemistry class?)

Second, you will have some pressure loss as the air travels through the line. If you lose pressure after your regulator then your delivery pressure at the gun will not be correct and the spray will suffer.

Third, any impurities that might be in the lines (dust, shavings, whatever) will be removed in the filter (as well as moisture or oil from the compressor) You want the air cleaned just before it is used to reduce the chance of impurities getting back into your air.

Your main line should be one size bigger than the line after the regulator so you don’t wind up with an undersized supply line restricting your sprayer. You should be able to find flow rates at various pressures for different pipe and hose diameters so you can make sure that the lines are big enough for your sprayer capacity.

One last thought. Make sure you don’t try to spray while someone else is using an air tool unless your compressor can handle the flow rate and pressure to supply both at the same time.

Other questions?

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

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