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air regulator on compressor

savarin

Active User
H-M Supporter-Premium
#1
The air pressure regulators on my compressor appear to have a bit of a problem.
The main one reduces the tank pressure down to whatever its set for into a manifold where I can take of at that pressure.
The other end of the manifold has another regulator that I want to set for an even lower pressure for my powder coating gun.
The problem I have is that both regulators slowly bleed pressure into the line so that when the trigger is pulled there is a blast of over pressure before it settles down to the set pressure.
I've never really worried about this before as it didnt cause any problems but now I want to powdercoat its essential (in my opinion) that the air supply remains at a low pressure without climbing.
To have both regs do this makes me question whether this is normal.
If it isnt can anyone recommend a good make of regulator thats accurate and wont let the pressure climb when the trigger is closed on the gun.
 

dlane

Active User
H-M Supporter-Premium
#2
Chances are the diafram has a small leek in it, I've rebuilt oxy/ace regulators before not air regulators
If you can get a rebuild kit for it would probably be cheapest .
 

savarin

Active User
H-M Supporter-Premium
#3
I just find it suspicious that they both do it. The do cut off but at a higher pressure that they are set to deliver.
 

RJSakowski

H-M Supporter - Premium Content
H-M Supporter-Premium
#4
You may have some debris that is fouling the valves in the regulators. It is possible that there was some rust that got dislodged and traveled through the line to the regulators. I have a similar problem with the check valve sometimes sticking and draining the tank pressure through the pressure relief valve.

I would suggest that you try increasing the regulated pressure and opening the lines downstream from the regulators to try to blow any obstruction free. If that fails, you can take them apart for inspection and cleaning.
 

savarin

Active User
H-M Supporter-Premium
#5
Thanks RJ I like that idea.
It feels like I'm never going to get this powdercoating system set up, one step forward and two steps back.
 

GoceKU

Active Member
Active Member
#6
I've had this happened before and is down to dirt preventing the valve to close or wrong sizing on the pressure regulator, Cfm ratings too low.
If is a one time use you can try running a Y and connect a slow leak with a blowgun to help you get consistent pressure to finish the job.
 

hman

Active User
H-M Supporter-Premium
#7
It would probably be worthwhile to add a filter just before your last regulator (once you have it cleaned/repaired/replaced). FRL (filter-regulator-lubricator) units are often used on industrial machinery. If you could find one of them, you could run it dry for your powder coating gun.
 

savarin

Active User
H-M Supporter-Premium
#8
I am adding an inline reg to the gun but as luck would have it I broke the adjuster off one of the other regs.
Grrrrrr
 

RandyWilson

H-M Supporter - Premium Content
H-M Supporter-Premium
#10
To get consistent pressure when spraying in this hot humid swamp, I would run two regulator/filters in series. with about 20' of hose between to act as a damper. The second regulator would be set to the desired pressure, the first regulator would be set to 25 psi over that.
 

savarin

Active User
H-M Supporter-Premium
#11
Gone through all the cheap regs I have, mixing and matching and cleaning and adjusting to no avail.
I will have to bite the bullet and buy (argh!) a new good quality one and see what happens.
 

GoceKU

Active Member
Active Member
#12
If is a one time use you can try running a Y and connect a slow leak with a blowgun to help you get consistent pressure to finish the job.
 

savarin

Active User
H-M Supporter-Premium
#13
If is a one time use you can try running a Y and connect a slow leak with a blowgun to help you get consistent pressure to finish the job.
That thought had crossed my mind but it hurts my sensibilities to bodge it that way. Not that I'm adverse to a good bodge when needs must:laughing:
 

Ken from ontario

Active Member
Active Member
#15
I would connect an extra air tank to your compressor and set it to the desired psi , you may get a more constant pressure that way, try it if you have an air pig or and old compressor tank that has its own regulator.
When the pressure in the auxiliary tank gets too low, the main compressor will kick in and fill it quickly but there will be less pressure fluctuation coming out of the 3rd tank, at least that's what I'm thinking should happen.