I just bought a 7 gallon aluminum portable air tank, which has a short hose with a tire chuck. It has a tire valve to fill it, a gauge, a shutoff valve and an over-presure relief valve all mounted in a brass manifold. The tire valve and shut-off are built into one combination assembly and are also an integral part of the manifold.
When I first pressurized it, I filled it to 100 PSI, and let it sit for a day, at which point it had bled down to ~85 PSI. As best I could tell, the over-pressure valve was leaking, and it is pretty much integral with the manifold. I complained to the manufacturer, and they sent me a whole new manifold. I installed that a couple days ago, and it leaks even worse. I haven't had time to figure out where the leak is this time, but I can hear it. I'm going to try soapy water next to try to pin down the leak.
I have a couple questions:
1) For a decent system, how well should it hold pressure? I would think that losing a PSI a week might be more reasonable.2) Can anyone recommend a decent source for a manifold, over-pressure relief and tire valve filling adapter? The tank has a 3/4" NPT opening, and if I can't fix this one, I'll just replace it with something other than Chinese garbage. The tank itself is very nice, but it's pretty obvious the accessories are junk.
Thanks!
Doug White