High flow fitting question

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PostPosted: Fri Mar 15, 2019 5:45 pm
This is probably a dumb question but I'll ask anyway.

I'm building an air line setup through copper running up and down the wall with ball valves at the bottom of each leg to release the moisture. Then I'll connect the filters after that and then my air hose. My question is if one fitting in line at any point isn't a high flow fitting, does it negate the rest of the high flow fittings and make them pointless?



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PostPosted: Fri Mar 15, 2019 7:32 pm
Hi flow fittings are really quick disconnects for your spray gun and air hose.
https://www.tptools.com/Hi-Flow-Air-Cou ... t,172.html
On that web page they show a Hiflo fitting next to a regular hose fitting.

What size pipe and fittings are you using in your system? 1/2" 5/8" 3/4" 1" ?
And then what fitting are you using that you think may restrict flow?
Dennis Barnett
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PostPosted: Fri Mar 15, 2019 8:49 pm
Doright wrote:Hi flow fittings are really quick disconnects for your spray gun and air hose.
https://www.tptools.com/Hi-Flow-Air-Cou ... t,172.html
On that web page they show a Hiflo fitting next to a regular hose fitting.

What size pipe and fittings are you using in your system? 1/2" 5/8" 3/4" 1" ?
And then what fitting are you using that you think may restrict flow?


I'm using 1/2" copper with a 3/8" air hose.

I've just read on different forums that the high flow fittings are ideal for spraying and I didn't want to drop the money on them only for it to be pointless. Like say the quick disconnect fitting coming out of the compressor tank is not a high flow fitting but the rest of the fittings to the hose and gun are high flow....does that make them pointless since the first fitting out of the tank is not high flow? I'm just trying to figure out the science behind it and I also don't want to spend all the extra money on them if I don't really need them or at least need them at every connection. Thanks.



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PostPosted: Sun Mar 17, 2019 11:00 am
Yes you are correct Putting hiflow fittings after a Restricted normal fitting would be pointless. The system will only flow as much as the Smallest fitting restriction will allow.
Dennis Barnett
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PostPosted: Sun Mar 17, 2019 1:24 pm
Thanks I figured that but I just wanted to make sure before dishing out the cash. I wasn't sure if the air getting caught in the filters or moisture traps would build up a little back pressure to the point where it wouldn't matter if the restriction was early on in the line as long as the fittings later were high flow.

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PostPosted: Sun Mar 17, 2019 5:19 pm
So where do you have a "choke" point at and what does it go down to?.......
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PostPosted: Mon Mar 18, 2019 4:03 am
Moisture traps and Air filters are designed to flow a certain amount of air flow and generally don't restrict air flow system.

You could have filters or traps that are too small?
Not all are the same
Dennis Barnett
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PostPosted: Tue Mar 19, 2019 7:27 pm
Oh I don't have a choke point since I'm still assembling all the parts but it was just something I was wondering in theory. It was more of a way of saving money if restricting it at the beginning of the run didn't matter but it doesn't look like that's the case. I appreciate the info!

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PostPosted: Thu Mar 21, 2019 9:16 am
Here's a 1/4" and 3/8" fitting I bought from Home Depot.
They both are made to connect to a standard air hose but as you can see
the smaller one is much more restricted inside the female coupling.
This is the choke point of a air system, the quick disconnect has a much smaller
air passage than even a standard 1/4" fitting.
The larger 3/8" has made a difference for me, even my impact wrench
is stronger now.

DSC02719.JPG
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(It's not custom painting-it's custom sanding)



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PostPosted: Mon May 06, 2019 8:28 pm
I know when I swithed to Hi flow fitting in my Booth and all my Paint guns it was a whole new world!!! Suddenly My Paint guns where real Paint guns Had to learn how to paint all over again LOL They definitely perform better with the bigger fittings its money well spent.
Dennis Barnett
A&P Mechanic, FCC General radio Telephone Operator
Line Maintenance A&P Mechanic and MOC Tech specialist.

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