The pressure is the same. With the air head restored, your PT valve leaks air instead of water. That's why you have to replenish it periodically. Replacing the PT valve would solve the problem.
When the water expands, it compresses the air and causes the air pressure to rise until it exactly matches the water pressure. The two are always in equilibrium with each other. And the pressure is equal throughout any closed fluid or gaseous system - that's fundamental physics too.
> Gary,
>
> On my 00 Diplomat, I noticed that when I would lose the air bubble in
> the top of the water heater tank, the pressure relief valve would start
> seeping water, not a lot, but would keep doing it until I would go
> through the procedure to restore the air bubble in the tank. After
> restoring the bubble, the relief valve would no longer leak water,
> usually for several months, but somehow the it would lose the bubble in
> the tank again, and the valve would go to seeping water again, repeat
> the above restore the bubble process, and all would be well for months
> again. Repeated this process about once a year for the seven years we
> owned the coach, full timer. (just traded for an 03 Windsor)
>
> Since the relief valve is a spring loaded closed valve, the pressure
> required to open the valve stays about the same, so I presume the
> pressure in the system is less with the air bubble in the tank than it
> is when the air bubble is mostly gone or all gone, since the valve only
> leaked when the bubble was gone but the leak stopped each time the
> bubble was restored.
>
> If the pressure relief valve was not in the system, wonder how high the
> pressure would go if no air bubble were in the system?
>
> Doug
> 03 Windsor - 98 Pk Ave
Gary
--
Gary & Nancy Brinck
2004 American Tradition 40V
2007 GMC Acadia
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