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aircon compressor help

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aircon compressor help

Unread postAuthor: roughboy » Sun Mar 22, 2009 8:52 am

so i got my compressor to work. I hooked a 300psi air hose onto the output copper pipe and on the other end i fittined an air chuck. i want to reach 200psi and each time i fill the gun chamber, when it reaches 20psi it tends to get harder and harder to fill the chamber, the air barely gets into the chamber and the air hose gets fatter and fatter is it normal should i keep forcing air into the chamber dispite the air hose getting sweld up or the fact that at 20psi the air chuck needs to be pressed against the tire valve with force? i get scared every time. i feel like the hose is gonna explode or somthing else.
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Unread postAuthor: Biopyro » Sun Mar 22, 2009 9:09 am

Your air hose isn't able to handle the pressure. Instead of transmitting the volume of air, it is absorbing it by expanding. Get yourself a pressure rated line.
It's like why we don't use balloons for chambers, because instead of the pressure increasing, the volume does. Also, it will explode if you inflate it much more. I'd reccomend throwing it away now, as it's probably damaged.
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Unread postAuthor: roughboy » Sun Mar 22, 2009 9:22 am

the air hose is rated for 300psi
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Unread postAuthor: Biopyro » Sun Mar 22, 2009 9:27 am

Well, whatever it's rated for, it's not managing to handle it. If you truly believe the rating then by all means take it to 200psi, but from the symptoms you've described, I think it will explode.
Perhaps it's been damaged by something? Can you post a picture?
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Unread postAuthor: psycix » Sun Mar 22, 2009 10:25 am

When a hose starts to bulge it is very close to failing.
Is it a rubber hose wrapped up in cloth or something?
I once had a bike pump with that kind of hose. When you take the clothing off, the rubber fails. The rubber is meant to hold it airtight, and the cloth is meant to hold the force of the pressure. Take damage the cloth when putting the hose on a barb or something and the rubber will have to bear the pressure, which it cannot.

Are you sure that the pin in the tire valve is pressed down? Maybe the valve simply closes.
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Unread postAuthor: roughboy » Sun Mar 22, 2009 10:42 am

the first layer is rubber then the second layer is somekind of thread sirally wraped around it then a third last layer is somekind of flexable pvc.
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Unread postAuthor: Biopyro » Sun Mar 22, 2009 10:46 am

Simple answer: buy a new hose. Your current one is damaged.
If you can see all three layers then isn't at least one damaged?

How old is it?
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Unread postAuthor: roughboy » Sun Mar 22, 2009 11:11 am

It's a new hose. just bought it yesterday? theres no visible damage on the hose. a picture of the three layers is on the box that i bought the hose inn.
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Unread postAuthor: Biopyro » Sun Mar 22, 2009 11:22 am

In that case it's really odd. Did the salesman say 300psi or does it say on the box? I really can't imagine it's supposed to be swelling in normal operation.
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Unread postAuthor: roughboy » Sun Mar 22, 2009 11:27 am

the box and the hose says 300psi. the whole hose swells up not just one spot of the hose.
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Unread postAuthor: Biopyro » Sun Mar 22, 2009 11:37 am

psycix wrote:Are you sure that the pin in the tire valve is pressed down? Maybe the valve simply closes.

If the valve isn't open properly, then all the pressure may be building up in the tube. If this isn't the case, I'm pretty much out of ideas.
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Unread postAuthor: roughboy » Sun Mar 22, 2009 11:54 am

Yes i think thats it, maybe when more air fills the chamber the more i have to push the air chuck down thus pushing the pin of the tire valve.
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Unread postAuthor: Biopyro » Sun Mar 22, 2009 12:00 pm

That's your problem then. I assume that you have the gauge in the chamber, so the chamber stops filling at 20psi, but that isn't necessarily when the hose starts to swell.
The valve shuts, and the pressure continues to build in the tube, until iut reaches past 300psi and begins to swell.

I would be vary wary of using that pipe now, as it may be permanently damaged.
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Unread postAuthor: roughboy » Sun Mar 22, 2009 12:12 pm

when the sun comes up i'll see if i can fix the problem because it's 3:00am here Thankx!
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Unread postAuthor: Gippeto » Sun Mar 22, 2009 1:57 pm

Odd problem you have. You should be easily able to hold the chuck in place past 100psi.

I suggest you double check the scale on your gauge. Is the scale you're reading (assuming it has two scales, they are usually different colors) perhaps in "bar"?

20 bar = 290psi

Just a suggestion. :)
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