Sears model 106.175541 has no PRV

by Jim O
(Cincinnati)

I have acquired a Sears model 106-175541 FREE. Runs and operates well. Well enough that I purchased a manual for it.( Which I am willing to share with anyone that needs it)PDF.


My question is that the manual states that this model doesn't require a PRV? I want to add one. What would be the correct PRV for a 100PSI tank? 125?

Comments for Sears model 106.175541 has no PRV

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Apr 09, 2016
PRV
by: Doug in s.d.ca

Jim:

I really wish I could see that manual - but I think I see what's going on.

Most of the other units (if not all) are 125PSI cutout-out. Yours is 100, and therefore uses a different PRV, which is that thing without a ring.

You could stick a wire in there to pull it out for when you store it. Also to test that it's working.

Then, consider "outboarding" the drain - get some pipe or tube and connect it where the the drain is now, and put a valve at the other end where it's both easy to reach and can be opened without spraying water all over.

Have fun.

Apr 08, 2016
PRV
by: Jim O

The diagram I have is from a manual I purchased.Have no scanner. It is a Sears original manual, but it is for several models, all with serial numbers similar, and including this model. The diagram shows a PRV and in parenthesis under the part number is except model 106-175541.
I has what I would describe as similar to a bleeder valve you would see on a Hot water heating system. Or like a PRV with the stem, ring, and top missing.
Compressor leaks no air from there.
I only use it a couple times a week. Don't like it setting around under pressure. Only way to relieve it is to get down on my hands and knees and open drain. HARD on a 63 year old!
Jim

Apr 06, 2016
PRV
by: Doug in s.d.ca

Jim:

Maybe you can post the parts diagram. And/or maybe wherever it says it doesn't need a prv.

On the sears site the diagram they show (for multiple models) has a prv item 54...

The only other way would be if they have something like a freeze plug somewhere. Which would be very strange.

Apr 06, 2016
PRV mystery
by: Jim O

This jewel is in great shape. Tank has hardly any rust. ( a spot or two ) Operates as it should, cycles off at 105PSI,( could be gauge .)PB blastered the tank drain threads,no water... ever, have run several times. Air nozzle only haven't put filter on yet. Haven't found a problem with it... other than a PRV. Has what looks like a PRV without the pull ring. Manual shows a PRV for other models, but not this 106-175541. Puzzling to say the least.

Apr 06, 2016
PRV for Sears model 106.175541
by: Bill

I'm puzzled that no PRV is required, Jim.

I don't know the details of the pressure switch on this compressor. Is it one that the pressure cannot exceed the cut out? Seems odd.

I personally would have no problem with a 125 PSI cracking pressure PRV on a 100 PSI compressor, as long as I knew for sure that the tank was in good shape.

This is a compressor with a lot of years on it I guess, and as such, I'd keep the PRV as close to the 100 PSI cut as I could to mitigate any tank wear.

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