Need corroboration on pressure issue findings

by Ben
(Atlanta)

Bill,

Thank you for all the helpful information you have compiled about our friend the air compressor. Thank you for saving me some bucks as well. I was just about ready to go out and buy a pressure switch but that was not the problem. I just wanted to run my test results by you to see if you agree with my analysis. I took the cover off the pressure switch and adjusted the cut off pressure dropping it below the current reading. I powered the unit up and bled out pressure and the pressure switch kicked in as it should and stopped when it hit the new lower cutoff. The compressor is definitely laboring. I checked the intake valve and it had good strong suction with no blow back. This led me to the conclusion that the valve to tank is where my problem is. As the pressure climbs the pressure in the tank overwhelms the compressor's attempt to pump more air into it. Does this make sense? And I have pretty much decided it is time for a new compressor - Looking at a Reciprocating, oiled one. What is your opinion? Thanks again for this service you provide.

________________________
Bill says...

You are welcome. Thanks for the thanks! :-)

If the motor is labouring, the load exceeds the motor capacity. That could be due to air blockage, the buildup of pressure in the tank defeating the ability of the motor and signalling a failing motor... many things.

You can disconnect and check the check valve going into the tank for sticking, wear... what have you.

The check valve isn't a common problem. An electric motor that is wearing out can be.

See the pages on BUYING and air compressor for a complete discussion on things you want to consider before plunking your money down for a new one. So much of the choice is predicated on what it is you want your air compressor to do for you, where it will be used... and so on. All covered already on that page.

Cheers,

Bill