compresser problem....

[donnie m]

i got a compresser that started to blow air out this little hole in this brass fitting. it releases more when the compresser stops running and will drain the tank. some kind of safety valve ? thanks in advance.

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[Bondo]

Ayuh,... The fitting, where the air enters the tank, is actually a check valve...

Yer's has crud in it....
Take it out, 'n clean it,...
That should cure yer problem...

 

[Outlawmws]

That appears to be the actuator valve to cut off the switch.

The pressure relief valve (Safety valve) can just barely be seen in the right edge of your pic. Its a brass part with a finger ring on it (for pulling to test the PR valve)

 

[bad_idea]

That brass fitting 'empties' the line from the compressor to the check valve on the tank. That way the compressor will restart unloaded. If air is continuing to hiss out of that brass fitting then the check valve is leaking by. If you take the check valve apart it should be a spring pushing a plunger against a stop. The plunger should have an o-ring or gasket on it. Make sure the spring is still 'spring-y' (not rusted or stuck) and replace the o-ring or gasket, clean up the insides of it and put it back together.

 

[donnie m]

That brass fitting 'empties' the line from the compressor to the check valve on the tank.

so is the check valve in that brass fitting in the pic ?

 

[bsaint]

No its at the end of the discharge line. Its called an "in-tank check valve." They aren't worth cleaning if you have 35 bucks. Pull it out and bring it into grainger for a replacement.

 

[donnie m]

No its at the end of the discharge line. Its called an "in-tank check valve." They aren't worth cleaning if you have 35 bucks. Pull it out and bring it into grainger for a replacement.

got it-thanks

 

[Cryptic1911]

yeah that's the unloader valve.. as was said already, when the compressor stops, the check valve in the line near the tank stops the flow of air back to the pump, and that valve releases the pressure between the head in the pump to the tank, so next time it fires up, it doesn't have to try and turn from 0rpm with 125psi behind it. It's got 0psi, so the motor spins up to rpm quick, and the pressure it puts out then pushes past the check valve to fill the tank

 

[Major Ramifications]

The poor unloader. Everyone blames it when the check valve fails.

 

[bsaint]

I think because the intank cv is like an iceberg, larger below the surface.

 

[bad_idea]

No its at the end of the discharge line. Its called an "in-tank check valve." They aren't worth cleaning if you have 35 bucks. Pull it out and bring it into grainger for a replacement.

It costs maybe $0.15 for an o-ring and 15 minutes of your time. To make it worth the $35 for a new one you would have to be making $140 an hour. Please fill me in on what I am missing here.

 

[SpeedyGee]

It costs maybe $0.15 for an o-ring and 15 minutes of your time. To make it worth the $35 for a new one you would have to be making $140 an hour. Please fill me in on what I am missing here.

Yes, they generally only need a clean. No need to fork out for a new one.

This probably doesnt need mentioning but make sure the tank is totally and I mean totally drained. It's easy to think oh its only got a few PSI left now I'll start undoing things, you'll be amazed how much force even a few PSI has.