Is my regulator functioning normally?

by dana simons
(Alexandria, VA)

DeWalt d55168, three years old, not often used.


If I set the regulator to 75, for example, and blow compressed air, the pressure immediately drops to 25 and holds steady.

When I release the trigger, the pressure immediately rises to 75 again.

If I use my fhlp spray gun and want pressure at 25 pounds, the immediate burst of air is 75. Note: the gauge will read 75 but drop to 25 as long as the trigger is depressed, which is the pressure I require. Is this normal?

It seems like a normal drop might be 5 pounds or so.

I dissembled the regulator, inspected it and reinstalled. Nothing changed and it looked fine.

Another thing, when you turn down the air pressure from high to low, there is no air release, no sound at all.

Comments for Is my regulator functioning normally?

Click here to add your own comments

Aug 24, 2017
Regulator
by: Doug in s.d.ca.

You say
"Another thing, when you turn down the air pressure from high to low, there is no air release, no sound at all. "

Not sure about yours, but *usually* regulators are of the relieving type. Sounds like yours is either non-relieving by design, or broken.

Try looking up the part at a repair parts site and see if you can find an actual part number and description, which may tell you what it's supposed to do.

Aug 23, 2017
Regulator functioning
by: Bill

As long as the compressor has the capability of building air pressure as fast as, or faster than, the demand of the air tool / paint gun, then yes, the regulator typical pressure range should be in the 5 PSI area, which is actually the accuracy of the low end gauges ... +/- 3-5 psi.

Sounds to me like the regulator is the impediment in air flow, Dana.

If you can Tee of before the existing regulator, and then install an inline regulator controlling that air flow to the air tool, that should prove the issue.

Or, simply replace the existing regulator and that should, in my opinion resolve the problem of air flow.

Click here to add your own comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Compressed Air Regulator Questions.