AIR Leak - HELP!

[benford]

OK, I removed the line from the regulator that goes to the drier, when I pressurize it with air it pushes the purge valve on the drier and it makes the wet tank make a pinging sound like its relieving pressure ,
could this be a bad check valve on the wet tank?
I could feel it in the fitting going in the tank kind of vibrating when its making the pinging sound, I have noticed this sound from the tank before but ignored it,

I removed the air line from the drier, the same line that I removed from the regulator, Had the DW pressurize the line and held my thumb over the end, it seems to be a good line no leaks, So is this line supposed to be under pressure at all times? because it wasn't when I removed it,

When the system purges it has a loud blast of air then bleeds off air for a few seconds before closing, I think this could be an extended purge drier, by the way it's an AD9 Bendix drier,

I ordered a new pressure protection valve for the wet tank because of the old one seeping air around the edges,

I replaced this drier last year,

[twinboat]

When you say regulator I think you mean governor. The pinging sound is air leaking somewhere. Take the line off the wet tank, the check valve should be right there. You can take it apart and look at it.

The governor, to un-loader line is only under pressure when the air reaches 120 lbs, to stop the compressor from pumping and un-load the air dryer.

A cheap test is to take out the drain plug and screw a pressure gauge in the wet tank. Watch it. The tank should hold pressure after it un-loads.

Remember, you do have a small? leak in the protection valve.

[benford]

I took out a fitting and installed an air gauge , after purging the PSI dropped quickly to around 78psi ,
I am including a pic of the pressure protection valve, this was taken after several minutes of run time , it slowly foams up, did not notice it foaming more when the gauge dropped, but this will be replaced Monday,

The other two pics are of the drier to wet tank lines, the green line comes from the drier and it doesn't have a check valve but the small black line marked in yellow does, I took it off and the valve will let air go from the tank to the drier, but not from drier to the tank, the yellow line in the drier pic,

the blue line comes from the governor

This is so confusing too many lines going to and from, driving me crazy!!!

Just doesn't seem right,

I made a video of the air gauge in action will try to figure out how to upload it,

[benford]

https://www.facebook.com/video.php?v...44533161799999

Air gauge video

[palehorse89]

Maybe this will help you figure it out Air Dryer Troubleshooting
Sound like the unloader is not closing in your video.........

[benford]

Originally Posted by palehorse89

Maybe this will help you figure it out Air Dryer Troubleshooting
Sound like the unloader is not closing in your video.........

The last remedy "C" this is what seems like is going on,

[twinboat]

Just looked at the Air Dryer, there is a check valve in the supply port on the bottom of the dryer. Take it out and check it.

I also think I hear a leak getting stronger as the air builds. It get drowned out by the noise of unloading. Could the line from the dryer to the wet tank be leaking?

[benford]

Originally Posted by twinboat

Just looked at the Air Dryer, there is a check valve in the supply port on the bottom of the dryer. Take it out and check it.

I also think I hear a leak getting stronger as the air builds. It get drowned out by the noise of unloading. Could the line from the dryer to the wet tank be leaking?

I took the check valve off the drier and took it apart , there was some black gunk under the valve , cleaned it out , it has two O rings in there seemed to be good as it was tight when reassembling , put it back together and......same as before...

I did notice the governor blew air out of the top port after the unloader closed is this normal?

I laid under there when it cycled and didn't hear any leaks,

[twinboat]

When you shut down, does the wet tank drain to "0". If it does, check the lines to tank A and B and any other lines out of it. The air is going somewhere.

The 2 dry tanks also have check valves in them that must be good, since the system holds air.

Good Luck

[Ray,IN]

That valve you have highlighted is the pressure relief valve. The reason it is stuck open is crud within the housing, oil, dirt, etc. The dryer filter appears like it has never been changed. When you have the dryer serviced, have the entire "kit" installed, and housing cleaned.

[DebnDan]

Extremely Helpful... Thanks

[DebnDan]

Originally Posted by palehorse89

Maybe this will help you figure it out Air Dryer Troubleshooting
Sound like the unloader is not closing in your video.........

Extremely Helpful... Thanks

[benford]

Haldex Isolation Valve
http://www.bendixvrc.com/itemDisplay...ocumentID=5425


I HAVE BEEN RESEARCHING THIS FOR DAYS AND HAVE FOUND SOME GOOD INFO ON MY COMPRESSOR AND THE NEED FOR AN ISOLATION VALVE,
(Stupid caps lock)

This is only for those older rigs with the Cummins/Holset type E compressor...

I ordered a new isolation valve from Ebay.. Haldex Isolation Valve.
Part Number is KN23500...$25.99 plus shipping

I figure I would try replacing this being it's not that exspensive,
I will let you all know what my results are,

[palehorse89]

Originally Posted by benford

Haldex Isolation Valve
http://www.bendixvrc.com/itemDisplay...ocumentID=5425


I HAVE BEEN RESEARCHING THIS FOR DAYS AND HAVE FOUND SOME GOOD INFO ON MY COMPRESSOR AND THE NEED FOR AN ISOLATION VALVE,
(Stupid caps lock)

This is only for those older rigs with the Cummins/Holset type E compressor...

I ordered a new isolation valve from Ebay.. Haldex Isolation Valve.
Part Number is KN23500...$25.99 plus shipping

I figure I would try replacing this being it's not that exspensive,
I will let you all know what my results are,

Good luck...... Hope this solves your problem