speedaire PRV Valve opening

by Mark
(Bartow, Florida)

I have a 25 HP speedaire compressor that when it comes on the PRV valve on the head of the center cylinder automatically opens and stays open until the compressor shuts off. I changed the prv valve thinking it may be bad but it does the same thing. Does this indicate a problem with the valves in the head?







Bill answers...

Howdy Mark. Welcome to you and all the other visitors form Florida.

The PRV valve is constructed with an internal piston that has enough surface area (force = pressure x area) that will allow air pressure to force open the port to atmosphere when the pressure in the system is great enough to do so. That will allow air to exhaust rather than allow pressure levels to increase to a dangerous level.

That the PRV valve opens when your compressor cuts in suggests to me that the PRV has failed. Since you've replaced it, and assuming that it works properly, then the only other thing I can think of is that the check valve on the air line from the compressor head to the tank has somehow jammed closed, preventing air from the compressor head from entering the tank.

In this scenario the fairly small line from the compressor head to the tank (also joined to the PRV valve) would very quickly build up enough pressure to blow the PRV.

Disconnect the air line where it enters the tank and check out the check valve contained within. I suspect that's your problem.

Cheers,

Bill

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How can I get a copy of the ASME CODE certificate on Speedaire air tanks

by Don Rockwell
(Tulsa, Oklahoma)

We purchased some Speedaire 13 gallon air tanks from Grainger for our units that shipped to South America. The customer wants a copy of the certificate for his records. The Grainger Item Number is 4TK09. Please advise how I can obtain the certificate.






Bill says...

Hello Don.

Go to the Speedaire link in the nav bar, click through to that page, and follow the guide to locating the nearest Grainger outlet. Contact them.

Also, did you inspect the tank carefully. Sometimes the info you seek is stamped right into the metal on the tank.

Cheers,

Bill

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Speedaire model 5z185b

by Gerry
(gilbert mn)

Is it ok to transport this compressor lying down?






Bill says...

Hello Gerry.

I can't tell you for sure as I am not familiar with that model.

I can tell you that if it is a lubricated Speedaire, then you no more want to lay it down in other than it's normal operating state, than you would want to turn your car on it's side. Not good for the car, nor the compressor, and you will have oil all over the place.

It were me, I'd keep my air compressor in the orientation that has it's legs at the bottom.

Cheers,

Bill

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