air compressor unloader adapter? (3/8 comp to 1/4 npt)

[nychan]

Trying to convert 3/8 male compression to 1/4NPT, anyone know of an adapter or idea on how to build adapter? TIA



Got a Puma PD1006 compressor for air lockers and tires in an offroad vehicle. When orig compressor switch stopped working, replaced with separate pressure switch and inline unloader. Unloaders (Control Devices-PA6) only seem to last a yr or 2 before they leak from the weep hole and comp continually runs . 1/4 NPT unloaders seem to be difficult to source while 1/4M NPT x 3/8M compression are available (amzn: Milton S-1097-6).

 

[5ubtle]

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It seems odd that the PA-6 could leak out of the weep hole fast enough to keep the compressor running continually.

 

[The Cobbler]

last a yr or 2 before they leak from the weep hole and comp continually runs

1/4 NPT unloaders seem to be difficult to source while 1/4M NPT x 3/8M compression are available (amzn: Milton S-1097-6).

listed as a combo check valve & unloader .
where/how does the air unload? maybe a regular unloader/switch would last longer ? I seldom have unloader issues.

Has a Maximum recommended compressor speed of 400 RPM.

what is your RPM?

 

[nychan]

Your MMC link references copper tube, I'm trying to adapt at that point minus the olive and end up NPT.

Re: weep hole loss... Pulled it apart today. The PA-6 uses what look like internal tooth lock washers on both ends. Not sure I can get them off w/o damage beyond reassembly. Something is not sealing inside, maybe spring needs to be stretched? I did grab a Milton 1098-4 Load Genie (1/4" Female NPT 1/4" Male NPT) off ebay but like a backup plan.

This is what setup looks like except the factory puma check valve was replaced with street 90. That was done b/c the PA-6 is supposed to function as unloader and chk valve. Red arrow is PA-6.


TIA

 

[The Cobbler]

sorry I can't make sense of what you have there .

 

[nychan]

listed as a combo check valve & unloader .
where/how does the air unload? maybe a regular unloader/switch would last longer ? I seldom have unloader issues.


what is your RPM?

air is escaping from weep hole on the side of the unloader prior to reaching air pressure switch > comp and comp continues to run eventually popping circuit breaker.

No idea on RPM, whatever it was set factory... where do you see max 400rpm?

TIA

 

[Wrench97]

Copper tube (short piece) between the 2 fittings.

 

[The Cobbler]

where do you see max 400rpm?

lower right of the screen shot

 

[nychan]

lower right of the screen shot


Gotcha from Milton page

AI says puma runs at 3k rpm.

 

[5ubtle]

Your MMC link references copper tube, I'm trying to adapt at that point minus the olive and end up NPT.

what?

Is this the Control Devices-PA6 that you've been using?

https://www.glencoairpower.com.au/wp-content/uploads/Control-Devices-Load-Genie-Unloading-Check-Valves-Datasheet.pdf