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Old 01-24-14, 01:44 PM   #1
kwpi
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Question Airzound refill at gas station

Hello,

trying to refill my Airzound at a gas station with a free of charge pressure check & air pressure refill station, I don't get over 2 bars (30 psi):
  1. At first the needle is showing 0 bar.
  2. Then I push the [+] button (= add compressed air) until the needle arrives at 5 bars (= 70 psi).
  3. Now, I release the tube that I had put on the Airzound's valve, and I hear a zishhhh (air is releasing somewhere).
  4. However, the horn works and gives some nice sound.
  5. Checking / measuring the pressure by stacking again the tube onto the valve, I get something like 2 bar (ca. 30 psi).


So: How could air leak and from where?

P.S.: No matter how long I do nothing but letting the compressor's tube sitting onto the Airzound valve, the needle at the gauge station does not release (= it is constant ~5bar/70psi).

What could I have done wrong?

Thank you
Regards
Karl
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Old 01-24-14, 01:51 PM   #2
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Maybe the compressor only fills to 70 psi.
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Old 01-24-14, 01:54 PM   #3
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Sorry to try to reexplain what my issue is:
In fact, it reaches the 70psi mark. (step 2)

However: Why are only 30psi left in the airzound canister after disconnecting the compressor. (Somehow air is leaking?)
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Old 01-24-14, 01:55 PM   #4
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Might be the compressor or air chuck is frozen. Or, the Airzound fill valve.
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Old 01-24-14, 02:00 PM   #5
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Do you mean with "air chuck" the device to be put onto the valve?
Somewhere I read it needs to be refilled slowly, however I think fast compression makes much heat... Do you mean frozen because of the coldness (it is ca. -10 °C = +14°Fahrenheit)
Unfortunately, this compressor is actually made for car wheels which have a much larger volume and thus have a more gentle increase of pressure than the 500ml air bottle.

I wonder why the air leaks in the moment when releasing the compressor's tube... (?)
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Old 01-24-14, 02:53 PM   #6
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Lightbulb

Now an idea came into my head:

Maybe the compressor connection doesn't reach far enough in order to push the valve's pin down.
So the reason for why it showed 5 bars (= 70 psi) would be then because the pressure grew up so far but didn't went into the Airzound. This is again because of the increasing pressure the compressor connection pressed itself back because of the opposite force caused by the high pressure.
So to summarize what could have happened: Air is pressed into the Airzound can and while the pressure increases in the bottle, the connector moves backwards without I noticed it. No sound appears because no air leaks because the air is "locked" in the compressor's tube without having the possibility to pass the valve because of the "pushback" the pin is not touched anymore at a certain point of pressure.

So much for the theory...
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Old 02-02-14, 11:03 AM   #7
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The seals shrink in sub freezing temperatures so it's probably going to leak plus Delta doesn't recommend using it below -6 C/32 F. I recall reading a post a couple months ago by a member here that actually damaged theirs by using it in 20 Deg. Fahrenheit temps.
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Old 02-04-14, 09:32 AM   #8
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Hello,

thanks for the reply. Now it worked filling the AZ with a portable compressor.*
Warning: When I first went to another gas station in the hope of a better matching valve, I found a different kind of machine with digital setting of the target pressure. Then I connected the AZ and the really loud horn sound came out of it while being charged and the actual pressure didn't move over 0.2 ~ 0.3 bars (ca. 4 psi), so the air directly was transformed into sound what seemingly annoyed the people around me.
*) Then with the portable compressor (looks like this one - "Tragbare Reifenfüller Blitz" - see attachment) and the help of the staff, it was able to fill the AZ up to 6 bars (ca. 90psi)
Btw. This was done indoors so as you said it might be because of freezing of seals is shrinking and thus leaking.

Fortunately, with higher outdoor temperatures I hope to have no further issues or at least less.

product site (in English, too)
- Pneustar 2 - BlitzRotary GmbH
Attached Images
File Type: jpg Tragbare Reifenfüller Blitz.jpg (23.7 KB, 10 views)
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Old 02-04-14, 01:01 PM   #9
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Car tires dont have high pressure requirements , so compressor regulators dont have to be set higher..

Last edited by fietsbob; 02-19-14 at 01:51 PM.
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Old 02-04-14, 01:47 PM   #10
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yeah that's what I heard too (cars ca. 2bar = ca. 30psi) and how do you mean this concerning to the question that the regulators dont need to be set higher?
(the compressor's scale goes up to 10bars+ ca. 150psi)
(As well do I think that the compressor works fine but it's somehow leaking at some point.)
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Old 02-18-14, 07:47 PM   #11
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Quote:
Originally Posted by kwpi View Post
yeah that's what I heard too (cars ca. 2bar = ca. 30psi) and how do you mean this concerning to the question that the regulators dont need to be set higher?
(the compressor's scale goes up to 10bars+ ca. 150psi)
(As well do I think that the compressor works fine but it's somehow leaking at some point.)
The scale on the gauge may go to 150 PSI but the compressor's regulator is probably set to shut off at a much lower pressure such as 70 PSI so the compressor doesn't run unnecessarily. Auto and truck tires would rarely need more than 50 PSI. The air chuck on the compressor you were using may have been worn or dirty as well causing a leak when you try to fill your AZ.
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Old 02-19-14, 12:49 PM   #12
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Quote:
Originally Posted by Murray Missile View Post
The scale on the gauge may go to 150 PSI but the compressor's regulator is probably set to shut off at a much lower pressure such as 70 PSI so the compressor doesn't run unnecessarily. Auto and truck tires would rarely need more than 50 PSI. The air chuck on the compressor you were using may have been worn or dirty as well causing a leak when you try to fill your AZ.
Thank you, that makes it more clear to me.
For me it worked at last once I've used a handy compressor in moderate temperature. (post#8)
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Old 02-19-14, 02:35 PM   #13
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Just some thoughts on public air compressors; Most of the ones where I live are pay-for-use. That would be bad enough but sometimes you get one that doesn't work right for whatever reason. I too have noticed poor cold weather performance when using these. The other day I had to get air into one of my work vehicle's tires because it was super low. First place I went to I put $0.50 into the machine, put the chuck to the tire valve and watched as nothing happened even though the machine was chugging away. Even worse it looked as though the tire was actually losing air.

The next place I went to was almost just as bad but at least it did pump the tire up. Took a very long time though but it worked. Thanked my lucky stars for that because the tire was almost flat at that point. As I recall it was a very cold day, probably around 18°F. Pity the fool who has to change a flat in sub-freezing temperatures.

A crying shame to have to pay for pressurized air but even worse when you only have so much change ( or no change ) on you. Last year I bought a portable compressor and keep it in my car. Hopefully I'll never have to use it because I've seen these mini-compressors in action before and they are far from awe-inspiring.
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Old 02-19-14, 04:39 PM   #14
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I've found the compressors at most gas stations anymore to be pretty pathetic. It's not like the days when gas stations were actual "service stations" and had real air compressors for running air tools and doing tire mounting and repair. You could easily pop a bicycle tire with those....... and the air was FREE.
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Old 02-23-14, 10:22 AM   #15
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I've found the compressors at most gas stations anymore to be pretty pathetic. It's not like the days when gas stations were actual "service stations" and had real air compressors for running air tools and doing tire mounting and repair. You could easily pop a bicycle tire with those....... and the air was FREE.
Where else can a motorist get air for tires? Their own car dealer? A bike shop? A bus depot? The local city yard?
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Old 02-23-14, 11:39 AM   #16
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Where else can a motorist get air for tires? Their own car dealer? A bike shop? A bus depot? The local city yard?
Around here most small repair shops, tire shops, etc. are happy to air up a low tire for a motorist for FREE, even the local transmission shop will do it. I live on the highway, I've even aired up a tire or two for passers by that stopped when I was out working in the driveway to ask where they could air up a tire because I knew the compressor at the almost brand new convenience store down the street was already worthless. If the convenience store chain "gas stations" are going to make you pay for air they should at least have decent compressors, a lot of them don't or don't maintain them. The only reason they even have a compressor is to squeeze that extra 2 bits out of you. My hometown had 6 service stations when I was a kid, you could get a flat fixed 24/7/365, now we have 1 convenience store. There's one place in town to get a tire fixed and they are only open Mon.-Fri., 8-4:30. I try to schedule all my flats for those hours but it never seems to work...........
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Old 02-23-14, 01:19 PM   #17
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I have a machine shop with a hose that will reach out the door to fill tires etc. I usually provide the service so people don't hurt themselves with the 200 psi we run in the system.
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Old 02-25-14, 08:33 AM   #18
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I used my bike floor pump to add air to my car tires. It works ok but takes a lot more work.
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