Unloader valve too noisy!

by John
(Ireland)

Hi Bill

I have a silent compressor with the unloader built into the pressure switch. Is there any way to reduce/muffle the noise when the unloader operates? The compressor is a very quiet runner so i can use it at night but the unloader discharge is akin to the air brakes on a truck.

Thanks
John
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Good point, John. The "psshhttt" of an unloader can be startling if you are using a silent air compressor.

Take a look at the unloader valve itself, and see where the air escapes. Is it a single hole, or is air getting out on both sides.

There are such things as air mufflers (see that page on this site) but plumbing the unloader into a muffler might be problematical.

Bill

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Unloader valve leaks when running?

by joe
(ogilvie, mn)

Typical compressor unloader valve - http://www.about-air-compressors.com

Typical compressor unloader valve - http://www.about-air-compressors.com

Unloader valve only leaks while compressor is running
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Joe, the air compressor unloader valve is supposed to open when the air compressor reaches the cut out pressure level and the motor stops, and when the compressor starts again, the unloader valve is supposed to close, so that the compressed air being generated is directed into the tank.

You don't indicate what your compressor is, or what the pressure switch / unloader valve combination is on your air compressor.

In the photo you can see the pin that protrudes from the side of the pressure switch. It is this pin that toggles this unloader valve.

So, first you have to make sure that the unloader valve is actually opening and closing by monitoring it while the air compressor runs up to cut out pressure and stops. Then, if the unloader is actually working, the problem is probably a leaking unloader valve.

Dismantle it, clean it, reassemble it, and test, or just replace it.

Cheers,

Bill



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C-AIR BRAND MOD#DF631222-10H5 UN LOADER PROBLEM

IT AS A C-AIR BRAND MOD#DF631222-10H5 SER#W054158019 IT LEAKS AIR OUT OF THE CRANK CASE WHEN IT IS RUNNING,BUT NOT WHEN IT IS SHUT OFF.ANY HELP YOU MAY HAVE WOULD BE GREAT SO CAN GET THIS UP AND RUNNING PROPERLY AGAIN.
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I don't recognize the brand, nor can I find any info about this air compressor on line.

To me the crank case is the oil sump. Are you saying that you have air blowing out the oil fill cap vent?

Before you comment telling us where the air is coming from, dump the tank with the compressor off, pull the cord, remove the line from the pump head to the tank, remove - clean - replace the tank check valve, and see if that solves the compressor problem.

Cheers,

Bill



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