Porter Cable c3550 gauges do not read the same.

by Larry Nachtrab
(Knoxville)

My compressor is a porter cable c3550. The gauge on the pressure switch is reading 90 psi while the gauge on the front by the regulator is reading 160psi. The pressure switch is not turning off the motor and the gauge on the front of the compressure is reading 180psi and climbing higher. Is there a way of knowing which one is correct?

Larry Nachtrab.
Larznach@gmail.com
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First of Larry, if this were my compressor, I would immediately pull on the PRV ring to ensure that it is movable. This will vent air. Then, just push back in on the ring stem and the PRV will be shut.

Second, the gauge on the front panel of the compressor, to the right of the black knob, is the regulator setting. If you turn the knob, this will adjust this pressure setting. The pressure setting is the pressure of the compressed air that will be flowing down the line to your air tool.

It doesn't matter what this setting is if the pressure in the tank is not as high as the pressure setting on the regulator, as the regulator can only regulate pressure by lowering it. The regulator cannot increase pressure.

So, your compressor runs, and runs, and the tank pressure (indicated by the other gauge) never gets to the pressure setting that the pressure switch needs to see to shut the compressor off.

Larry, you don't have a gauge problem I don't think.

What you have is a Porter Cable C3550 compressor that has - likely - a gasket leak or a valve failing, and this is preventing the tank pressure from reaching the cut out level of the compressor.

See under troubleshooting on the site map page for links to pages with more info about this.

Bill


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Porter Cable PRV

by Darrell
(Austin, TX)

I have a Porter Cable 150 psi compressor which has a PRV that releases pressure at about 75 psi. When it was new, it would hold the full 150 psi.

Is the PRV defective?

Is there some way I can adjust it/maintain it, or do I just need to replace it?

And if I need to replace it, what sort of store would I look for that would have PRVs in stock?
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Darrell, I would suggest that if the PRV is letting go early, and you have a single cylinder air compressor, then the PRV itself has failed.

Chasing down a new one could be complex, though there should be a lot of industrial type compressor repair shops and sales outlets. Your PRV should be fairly common at those shops, though you probably won't find one at the big box stores.

I have seen lots available on line. Simply search for the term compressor PRV, or some such, and you will find lots of people happy to sell you one. There might even be a PRV seller on this page somewhere?

PRV's are rated for pressure so get one with the same pressure setting as yours was, and with the same thread.

Cheers,

Bill

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Porter Cable c2002 type 3 pancake compressor No Tank Pressure

by wayland
(Pachuta, ms)

Porter Cable c2002 pancake compressor

Porter Cable c2002 pancake compressor

Bill, I have a Porter Cable c2002 type 3 pancake compressor that will not build up pressure in tank.

Have removed the check valve to verify air flow into tank which there is and feels constant.

Have also verified that the check valve is operating properly. Did notice that the check valve and tube feeding it becomes extremely hot after only a minute or so. Is this normal?

Have also verified that the tank drain valve is seated to close off tank.

Have also noticed that when viewing the manifold face-on there is a constant flow of air from the left grill. Is this normal? Unit is only two years old and used very little.
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Good day Wayland.

Good that you pulled the tube to the tank - and yes, them getting very got is natural. Compressing air generates a lot of heat.

That air is flowing from the tube freely does not mean that under back-pressure it flows as freely.

If the pressure in your tank starts to rise, as I suspect it does, as that pressure rises, your air compressor has to work harder to drive air into the tank.

It is the working harder part when problems manifest themselves.

If the check valve is not impeding flow, then I would suspect that you have a valve problem or you have an internal gasket that lets go when the backpressure in the tank reaches a certain level.

See the troubleshooting section on the sitemap page for more things to check.

Cheers,

Bill

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