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Compressor safety valve keeps popping

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Forum topic by Grantman posted 08-19-2017 04:26 PM 334 views 0 times favorited 10 replies Add to Favorites Watch
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Grantman

112 posts in 3779 days


08-19-2017 04:26 PM

Topic tags/keywords: compressor porter cable

I have a five year old Porter Cable pancake compressor, the red bellied 2002 model that I got from the Depot.

About a month ago the safety valve started popping at about 180 psi. My workaround was to charge it to 150, do what I had to do, and finish my work.

A little online research told me the valve was easily replaceable so this morning I did so.

Firing it up it happened again. Brand new safety valve and actually I replaced the drain valve too as long as I was at it.

Looking for any insight as to why the safety valve would pop at only 180 psi. The regulator is set for about 95 psi, by the way.

Thanks in advance.


10 replies so far

View MrUnix's profile

MrUnix

5712 posts in 1952 days


#1 posted 08-19-2017 07:16 PM

What model is the compressor? The C2002 is only rated for up to 150psi. I don’t think I’ve ever seen one of those little compressors that was designed for much more than 150psi… the current ones listed on their site are all 135-150 with only one as high as 165psi. Sounds like you have a problem other than the safety valve (which seems to be working correctly!).

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View Andybb's profile

Andybb

326 posts in 357 days


#2 posted 08-19-2017 07:28 PM

+1 Brad

180psi from a pancake (or any small compressor) is awfully high IMO. Sounds like the valve is working and preventing a catastrophe.

What do you mean the reg is set for 95psi? How is it getting to 180 if set for 95? What am I missing? The output is set for 95 but it is charging the tank past 180?

-- Andy - Seattle - The best thing about being a pessimist is that you're either right or pleasantly surprised.

View SignWave's profile

SignWave

438 posts in 2788 days


#3 posted 08-19-2017 08:12 PM

It sounds like the pressure switch is not shutting off at the max pressure. I agree that the safety valve probably prevented a serious accident. I would not operate this compressor until you change the pressure switch and make sure the new one is shutting of the motor at the proper max pressure.

-- Barry, http://BarrysWorkshop.com/

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Grantman

112 posts in 3779 days


#4 posted 08-20-2017 02:05 AM

Thanks to all. I don’t know anything about a pressure switch but I’ll research it. In the past I’ve simply turned it on and it shut off automatically and I never looked at the actual readings.

Re:95 on the regulator, it’s my understanding that that’s the pressure at which the the air goes out, not what’s in the tank.

Appreciate the feedback. New pressure switch here we come, I guess.

View cutmantom's profile

cutmantom

401 posts in 2788 days


#5 posted 08-20-2017 02:12 AM

The switch may be able to be adjusted

View Gilley23's profile

Gilley23

277 posts in 135 days


#6 posted 08-20-2017 11:07 AM

It sounds like you’ve outgrown your little compressor and need one with a larger air tank. Your safety valve works and is working, you don’t need a new one. The issue is that you’re trying to push your little pancake compressor further than it’s meant to go.

View Kazooman's profile (online now)

Kazooman

825 posts in 1706 days


#7 posted 08-20-2017 01:12 PM



It sounds like you ve outgrown your little compressor and need one with a larger air tank. Your safety valve works and is working, you don t need a new one. The issue is that you re trying to push your little pancake compressor further than it s meant to go.

- Gilley23

The safety valve releasing has nothing to do with pushing his compressor further than it is meant to go. The OP didn’t even mention what he was using the compressor for. Starting it up for a single shot with a pin nailer would result in the pressure relief opening. Sine Wave seems to have it right, the pressure switch is not shutting the compressor off when it reaches the set point and it keeps running until the pressure relief kicks in.

View splintergroup's profile

splintergroup

1488 posts in 976 days


#8 posted 08-20-2017 02:14 PM

The 95psi is the air pressure in the line, not the tank. Give the pressure switch a good blow out with compressed air, may be saw dust plugging up the works.

View SignWave's profile

SignWave

438 posts in 2788 days


#9 posted 08-20-2017 03:09 PM



Thanks to all. I don t know anything about a pressure switch but I ll research it. In the past I ve simply turned it on and it shut off automatically and I never looked at the actual readings.

- Grantman


I think this covers replacement for your compressor
https://www.youtube.com/watch?v=XC5knqVm66k

-- Barry, http://BarrysWorkshop.com/

View Grantman's profile

Grantman

112 posts in 3779 days


#10 posted 08-20-2017 09:59 PM

Thanks again for the last couple of replies. I watched the video and looks pretty straight forward. I guess to blow it out with compressed air means getting a can ‘cuz if it’s taken apart, ain’t much I can do with it at that point!

Cheers to all.

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