How do I turn the pressure up on my air compressor?

by Lars
(Vernon Bc)

How do I turn the pressure up on my 5hp shop compressor. It used to charge up to 110-120 now it just wants to stop at 80 and not go any higher. It is a wiseworth canada challenge air?

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Hello Lars... If I understand correctly, your air compressor runs OK, but the air pressure in your tank reaches around 80 PSI, and even though the air compressor continues to run, the pressure in the tank won't go higher? Is this correct?

If so, then sorry, you cannot turn this pressure up, Lars. What you have is / are mechanical issue(s) with your compressor that are preventing enough pressure build up in the tank so that the pressure switch can trip to off at the cut out pressure setting.

The compressor may have an intake valve problems, pressure valve problems, internal gasket problems, and so on.

On the site map page under troubleshooting is a link to a page about why air compressors run but don't build pressure. Have a look at that if you would, and if you have a specific question after reading that info, do send it in.

Cheers,

Bill

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air compressor loose power on hand tools

Emglo hot dog style air compressor

Emglo hot dog style air compressor

my wife bought me an angle grinder for christmas and I loose power after running it about 5-10 seconds after starting it up. It says it is based on 90 lbs pressure and I'm running a 4 gal. compressor Emglo Air-mate Air Compressor - Model AM78-HC4V

•4.1 cfm @ 100 psi
•125 psi max
•115V, 60Hz, 14A
•Single phase

I realize I need a beefier compressor but is it due to horsepower or storage tank size?
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Hi there...

You indicate that your air compressor can generate 4.1 CFM at 100 PSI.

You do not indicate what the demand of your angle grinder is.

Compare the two. I suspect you will find that your angle grinder will use quite a bit more air at 90 - 100 PSI than your compressor can generate.

A larger tank would mean that you could run your grinder for a little longer before running out of compressed air, but then, you'd have to wait longer for the bigger tank to fill back up.

Your compressor is undersized for the air tool you are trying to use.

A larger air compressor will have a larger HP size motor and a larger tank. If you plan on using your air grinder a lot, get a compressor that has the capacity to run it.

See the Sizing pages for more detailed info.

Cheers,

Bill


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How do you control the air pressure?

by Ken
(Teaneck, NJ)

I just purchased a 3 gallon air compressor and brad nailer from sears

1. Mine keeps going up and then shuts off

2. I pulled the ring on the air pressure relief valve and it nearly shot my finger off.

1. How do you control the air pressure? 2. Is the air pressure relief valve supposed to blow a lot of air out at one time
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The air compressor is supposed to cycle on when the pressure in the tank falls below cut in, and then shut off when the pressure in the tank reaches the pressure switch cut out setting.

You control the air pressure to the air tool by adjusting the regulator.

The PRV valve is designed to blow off when the pressure in the compressor tank gets too high - like, for example, when the pressure switch fails - and the PRV will dump a lot of air quickly. That's its job.

Aside from testing periodically by pulling the ring, you rarely need to use the PRV. See the page on that and other components on this site to better understand how they all work together.

Cheers,

Bill

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Schulz or campbell for dental office?

by Emmanuel
(Dominican republic)

Need to know wich one is better quality for daily use in a mid-size dental office. Thank you
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Emmanuel, I would be delighted to offer my opinion, but you haven't provided enough information to allow me to do that.

What is the air demand of the dental office at peak?

What is the HP of the two units you are looking at?

What is the noise level of each, and where do you plan on putting the compressor to eliminate the typical noise pollution from a functioning air compressor?

What after-compressor are you installing, to remove the water, air-borne debris and oil residue from the air stream?

Please add a comment here with more details, and I would be glad to try and help.

Cheers,

Bill

Comments for Schulz or campbell for dental office?

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Sep 29, 2013
Details about
by: Emmanuel

Hello bill, thanks for answering me that soon.
The air demand at peak its about 3hp because i need at least 1hp per dental chair (i have 3) .
About the noise thats secondary for me because we are planning to install the unit in an outside of the office room so it wont disturbe us and the after-compressor filter im not really sure what to install yet but it would be good to hear your suggestions. Thank you very much!
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When you read the compressor sizing pages Emmanuel you will see that you can expect 3-4 CFM at 90 PSI for each HP of electric motor that your compressor has. When you say that you need one HP per chair, that suggests that your dental tools will draw 3-4 CFM. In which case, if that's what you need, then you need to read the Buying page to understand all the criteria that goes into making a decision on what compressor to acquire. That I cannot tell you as some of the variables are those unique to where you are in the world.

I don't know the details of the air compressors that you are researching.

If they are oil lubed, then they will impart oil residue into the air stream to your patients. Even if they are factory lubed for life, there may still be contaminate carry over into the air stream.

If this were me, I would want to have in the line before the dental tools the following:

First, from compressor a general purpose air filter / water remover with 40 micron element.

Then, another air / water filter with a 5 micron element.

Then a coalescent filter to remove oil carryover.

Then an in-line air dryer to remove water vapor from the air stream.

Then, and only then, would I allow that air to enter the dental tool and into the patient's mouth.

I am not a dentist yet I have to believe that there are guidelines published by your dental association that have to do with compressed air used in a dental office. Find them and heed them.

Cheers,

Bill


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