Another Compressor Check Valve Problem

[ricepudding]

So I was going to top up my cars tires today, so I turned on the air compressor. It built up pressure to 125 psi quick as usual, but the relief valve keeps blowing off air after the compressor stopped. Googled around, and found that I most likely have a faulty / dirty check valve. What bugs me though is that I haven't run my air compressor for more than 2 hours in total, it's brand new!
Now, what my question is, is how do I remove the check valve? Its cemented in place with some kind of glue, and once I get it off, how do I clean it? It looks like this one:

 

[gungatim]

sounds more like the relief valve is blowing, is it the one with the little ring you pull out? if so, you may be over pressure. when it bleeds down a little bit, try pushing back in on the relief valve.

The check valve is only in play when starting up under pressure. it can only leak back into the cylinders, and stop at the reed valves (assuming they are good, but at 125 psi they must be)

 

[pepi]

Think you are looking at a faulty, dirty relief valve, if the compressor has stopped and then the relief valve pops. Could try with no pressure in the tank to just pull the manual relief in and out a few times just to reseat the valve, wind it up, see if it will hold the pressure.

If the compressor is running and the relief valve trips, you are looking at over pressure. Pressure switch not working and shutting down the compressor when the 125 is reached.

A check valve only keeps the pressure going in one direction. Relief valve is a mechanical redundant fail safe tank pressure regulator. Activates when the pressure goes above the fixed setting of the pressure switch.

 

[scw1991]

can't say I've ever seen a valve like you've shown on an air compressor. Check valves can stick if there's a lot of rust in the tank. If a safety blow off valve is cracking open, then it sounds like you're over-pressurizing the tank. Or the safety blow off valve is sized improperly.

 

[Techie1961]

If it is the pressure relief valve it might be a bad relief valve or if it is a two stage compressor, you might have a sticking inlet or outlet valve in the cylinder head (depends on which relief valve and style of compressor). The check valve will give you two symptoms; it will be hard to start or if you have a relieving pressure switch, you will notice air venting out of it constantly when the compressor is not running.

What model compressor is it?

BTW, it can be removed and the "cement" is likely just a sealant. Use a proper 6 point socket on it and it should come apart.

 

[ricepudding]

So I decided to try and open the side cap on the check valve, and found that the check valve was stuck open by what looks like a piece of a sucker! Or it might be some sealant? Anyways, i cleaned it out, and now the compressor is back to 100% .

 

[Techie1961]

Is it the red thing that I see in the photo? That is an odd one. I'm thinking that it had to be something from the factory that got past someone. I can't think of anything that could have failed that is red. Maybe some packing material? Unless they use plastic reed valves.

 

[ricepudding]

Is it the red thing that I see in the photo? That is an odd one. I'm thinking that it had to be something from the factory that got past someone. I can't think of anything that could have failed that is red. Maybe some packing material? Unless they use plastic reed valves.

I Think it might just be some packing material, or thread locker? Anyways, it was an easy fix, so I'm happy now.