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Tool Talk Discussion Forum

Air Compressor check valve question.

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Jay87T

05-19-2005 05:39:35




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Big air compressor is leaking air somewhere, the leak is so slow I cant fint it anywhere. Im going to guess its the old check valve. this check valve thats on it now is a 1/2 inch inline valve with a small tube comming from the top going to the pressure switch for unloading the pressure at the end of the cycle. I cant seem to find a replacement for this type of valve that will let me unload the pressure like it does, my question is, can I put a check 1/2 check valve after the pressure switch? or does the valve have to be always infront of the pressure switch.

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txgrn

05-21-2005 05:01:51




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 Re: Air Compressor check valve question. in reply to Jay87T, 05-19-2005 05:39:35  
I had a horizontal tank compressor and one day noticed a little puddle of water on the floor under it. In short, the tank had rusted from the inside to the outside and only made a pin hole. That hole was enough to do what you are talking about.

I was able to "catch" this critter cause I saw the water on the floor. Wouldn't have thought to suspect that the TANK (of all things) was leaking.

Also, might check the drain valve and make sure it is not leaking also.

Mark

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Charles (in GA)

05-20-2005 16:27:50




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 Re: Air Compressor check valve question. in reply to Jay87T, 05-19-2005 05:39:35  
The pressure switch itself looks at tank pressure. Its probably screwed into a 1/4 pipe fitting on the tank. The head unloader, whether pressure switch operated via the small tube or otherwise, must unload the head of the compressor, thus the head itself, or the line from the head to the check valve is where the unloader line must go.

Indeed the Grainger catalog has what you need.

Charles



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Bob

05-19-2005 05:58:04




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 Re: Air Compressor check valve question. in reply to Jay87T, 05-19-2005 05:39:35  
Grainger has MANY versions of air check valves with the unloader port. Below is a link to one listing. See part #4X838.

Also, they sell the LOAD GENIE check valves that comebine the check valve and unloader, and eliminate the need for the unloader line to the pressure switch.

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