Compressor struggles to refill, then blows breaker

by Amit
(Toronto)

On start-up, the compressor will fill regularly, but when it needs to refill, it struggles and sounds like it is cutting out, until the internal breaker finally trips. After that, nothing will happen. The motor hums a bit, but the internal breaker trips each time. Any thoughts?


______________________
Bill says...

Hello Amit. Try this. Unplug the compressor or turn it off, drain to zero PSI. Turn it back on. As the pressure nears cut out, watch and listen for the operation of the unloader valve as the compressor stops.

If you don't hear it expelling air, then air is trapped over your piston, creating an overload on the motor when it tries to start.

Let me know as a comment here what you find, OK?

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.

unloader valve ~ blow off the unloader line

When to compressor reaches pressure the unloader valve will blow off the unloader line

_______________________
Bill says...

Are you saying that the problem with your air compressor is that the air line to the unloader valve comes off (out of the fitting) when the compressor reaches cut out pressure level?

Or are you saying that the unloader valve doesn't unload?

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.

Excessive Load on Compressor

by Roy
(Spooner, WI)

My compressor will start fine when there is no pressure in the tank. When the motor is restarted when the compressor reaches the low limit for regeneration, sometimes it will trip the breaker. It seems like there is too much head pressure on compressor cylinder. Is there a one way valve that allows pressure into the tank, but relives the pressure off of the cyclinders?

__________________
Bill says...

Hello Roy. Yes, there is. Check the UNLOADER VALVE page linked from the site map. Details about what they are and do are found there.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.

Think unloader valve is faulty


(Sherry)

Think unloader valve is faulty motor struggling not sure where valve is located

____________________
Bill says...

Have a look beside the pressure switch. Depending on your type, a toggle may protrude from the side or end of the switch cap and intersect with a pin on the unloader valve.

Be nice to know what type of air compressor you are having problems with.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.

my unloared valve plastic line seperated at valve.

by michael danley
(weatherford texas)

factory seal at reguator valve seperated

_________________
Bill says....

Howdy Michael. I'm not sure what your question is about your unloader valve plumbing.

Nor am I aware of why the line came off the valve. Can you not just reattach it?

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.

will unloader valve unload pressure if power is lost

If power is shut off to the compressor from the circuit breaker instead of the switch on the compressor will the unloader valve still unload the pressure over the piston?

_________________
Bill says....

It might not. If the pressure switch isn't seeing the pressure level necessary to toggle the switch, turn off the power to the motor, and toggle the unloader valve open, then even if the power is lost, the switch may not trip, as it's waiting for an air pressure signal from the tank.

I do not believe a pressure switch trips to off in the event of a loss of power. The switch needs a pressure change to trip on and off.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.

I need a new valve

by Joe G
(Clovis ,ca)


I cant find a new unloader valve any where . It is mounted on the switch box with 2 screws.

Please look at the pic

559-325-xxxx

Joe Guraro

___________________
Bill says...

Hi Joe:

You need to put this post on the parts needed page, and also tell folks the make, model and horsepower of your air compressor.

I've modified your phone number. If you want it back in, please add it again with your area code, and probably good if you put your email address in your comment as well.

Cheers,

Bill

Click here to read or post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Has Unloader Valve Issues.