Quincy 340 Compressor ==> Compressed Air System

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I think that I am done working on this compressor. I have reinstalled the electric unloader valve. I had some trouble with it, since due to 58 years of use, the valve was packed with crud and leaked air from tank when the valve was off. So I had to take it apart and soak the parts in gasoline for a few hours and wash them.

To make the unloader work, I had to replace the old diaphragms. Due to their age, they were as brittle as saltine cookies and obviously had to be thrown away.

The unloader works by opening intake valves. Also, when it unloads, it dumps contents of the high pressure cylinder to atmosphere. That was obnoxiously loud when the compressor unloads when full. To mitigate this, I bought a 1/8" NPT muffler and attached it to the opening with a 1/4" OD copper tube and compression fitting.

I also put all cables in conduits or use armored cables where necessary.

For air hose, I installed a big hose reel, which I now know is much better than hanging hose on a hanger (because it does not kink).

The pressure switch is set to maintain pressure between 110-145 PSI.


(Click on the thumbnail images to enlarge)
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Muffler for dumping high pressure cylinder when unloading
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Air intake filter and muffler
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Gerotor oil pump.
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New 3.5" pressure gauge that I installed.
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Cushion chamber is on the left.
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Reliance 10 HP Motor
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Reliance 10 HP Motor
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Unloader control.
Power OFF -- pressure from tank is supplied to unloaders
Power ON -- unloaders vented to air, tank closed
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Mag starter with overloads
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15 CFM Compressed air dryer
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Air manifold that I made from a hexagonal brass bar.
It has several chambers.
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Big hose reel
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8" diameter brass Ashcroft gauge.
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Trinco sandblaster. 24 inch wide.
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Exploded picture of the unloader control valve
It needed a good washing.

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