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BondoKing 09-17-2005 11:35 AM

Gun Filters and Regulator placement
Last night I was putting together a new gun that my wife had bought me and brought home to try and surprise me.. I have always put those little bulb filters on the bottom of my gun and then the regulator after it... I wanted to insure that the air coming in is clean... and yes I have traps/filters etc on the wall.... However I got to thinking last night... I know that is dangerous... and I thought that for the correct pressure reading that the regulator should be the first thing attached to the gun... I have never had a problem spraying anything the other way around, but she bought me a GTI Millennium Devilviss and they are air hogs.... Says it requires 15.5 cfm...

It came with a regulator and I bought hi flow fittings to allow more air in...

Whats your opinion on regulator and filter placement.

BTW I think most of you will find this very funny and another reason for people not to listen to jobbers... They tried their best to tell me that guns really don't require that much cfm and it is based on what you are spraying...

OMG do I sound that dumb on the phone I wonder?? I told the guy it was all about cfm for proper atomization and he said no no , how big is your compressor... I told him and he said any 5 hp would be fine and mine being larger should not be an issue........ Kept asking about tank size and repeatedly telling me he had been selling guns for 28 yrs and he knew what he was talking about....

Moral of the story: Don't send your wife after parts from the local jobber, and don't ever pay too much attention to what they say :D


302 Z28 09-17-2005 11:49 AM

Obviously the guy knows nothing about what he sells.

I have always used regulators and filters at the gun in addition to a combination moisture/filter at the tank. never had any problems.


MARTINSR 09-17-2005 12:02 PM

I have to tell you something guys, if you need a filter at the gun, your system has some problems. Your air should be free of junk long before it gets to your gun. With a proper free flowing piping designed to cool the air and trap the water, simply by design, along with a filter before the hose leading to your gun, you just don't need anything more. The typical use of these filters are only there to make up for poor plumbing and filtering prior to the gun.

Devilbiss does make a pretty decent in hose filter, but even it is a CFM robber.

I use the following diagram as an example and it has worked wonders. In my garage I used it but went all the way to the end before installing the filter. I only have one hose outlet (in your garage, are you going to be using more than one tool at a time?) It is 35 ft from compressor to that outlet. I have zero water problems.


BondoKing 09-17-2005 12:57 PM

I agree with you Brian and it may be from years past, as the reason I am still using those filters at the gun... I have a water trap and a motorguard filter system inline... I have not had any issues with water having both, but I had always used those filters and never got away from it... I will try without the filters and see what happens... If I get junk, then I will need to replumb my next little shop... I am moving in a week so there will be no need and worrying with what I have now. Thanks for the diagram


rrmccabe 09-17-2005 01:14 PM

Well my opinion is the modern HVLP and LVLPs have personalities based on CFM.

I am to the point that all regulation and filtration needs to be done in the "big line" near the compressor and never after the hose.

So no filters for me including the little fluid filter in the bottom of the cup(reason change for me).

So yes, I think volume does make a difference.


BondoKing 09-17-2005 01:52 PM

I have never used the filter that goes in the bottom of the cup... I think it is a waste and it will slow flow... JMO


302 Z28 09-17-2005 03:46 PM

Nothing wrong with you guys comments about not using the filter at the gun. It goes back years with me and I guess it is ingrained, I just do it. Can't say it has caused a CFM problem, can't even say it has trapped any trash. I guess I look at it as cheap insurance.


beemdubya 09-17-2005 05:44 PM

I thaught the incline should be away from the compressor? if it runs towards the compressor then its just going back into the air supply.. if the incline is away it goes more towards the drains? no?

MARTINSR 09-17-2005 08:14 PM

Yep, I have seen it both ways, this particular diagram is from Sharpe. The way I see it, running back to the compressor would be more efficient in keeping the water droplets from reaching the end of the line where your hose is. If it leans away from the compressor, that would be more efficient in keeping the CFM up. The air molecules wouldn't be hitting the water molecules on the way down the pipe. Just a theory from a non-engineer type. :)


BondoKing 09-17-2005 09:56 PM

Sprayed 2 heavy coats of clear today without the filter and not a problem one... Guess my others do the job... Well that will save about 5 bucks a pop from now on:D


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