wwhitney
In the Trades
I believe I answered that in passing in my previous post, if the air tank pressure rises to 80 psi, the water pressure rises to 80 psi, too.
Cheers, Wayne
Cheers, Wayne
That's fine with me. I couldn't care less.No James, it is not. Like I mentioned above, I did that. The air pressure at that point in time will equalize with the water pressure. In my case, my air pressure is set to 55, when put back into service with a water pressure of 60, the air pressure is now 60. Because the water pressure is greater than the air pressure - they equalize. Until the water is heated ........
This is where you are mistaken, Figure 3 in the reference is correct.
If you have a closed system with a flexible membrane separating two fluids, the pressure in each fluid will be equal. If not, the higher pressure side would push on the membrane more than the lower pressure side, moving the membrane towards the lower pressure side. This movement would provide more volume for the higher pressure side, reducing its pressure, and reduce the volume for the lower pressure side, increasing its pressure. The movement will only stop once the two pressures are equal.
In other words, the pressures on the two sides of the membrane will be in equilibrium.
Cheers, Wayne
They try to design them so that the diaphragm is not stretched-tight.That would be true only if the flexible membrane didn't impart any pressure of it's own. As an elastic membrane stretches there will be several psi difference in the fluid pressures. The diaphram in an expansion tank does not behave like a free-floating piston.
This is awkward, but...
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