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 Brinck wrote:
> Not sure what your point is, Chuck. I'm not arguing with you about Shurflo failures and I AGREED that back pressure is a problem that Shurflo had to deal with. The only point I was trying to make is that the air head in the tank that was alluded to in your earlier post neither causes nor alleviates back pressure from the hot water tank - the back pressure is there just the same whether there is a air head or not. The same would apply to the air head in an accumulator, which is probably why they don't recommend that either.
>
> Am not trying to be argumentative - just clarifying the effect of an air head in the system.
>
>
>> Gary,
>> Shurflo warranty's their high end Smart Sensor pumps for 3 years. They were
>> experiencing a excessive failure rate of damage to the internal pump from
>> back flow pressure. They do not recommend the need for using a accumulator
>> tank with that pump. Their studies and testings found that that the the pumps
>> that failed came off RV's with hot water heaters as opposed to RV's that were
>> equipped with Aqua/Hydro hot systems. Because of replacing pumps under
>> warranty, Shurflo had to either quit making the Smart Sensor pumps or correct
>> the situation be redesign. They chose the latter. I had several discussions
>> withn their engineers on the phone and at the last FMCA International rally.
>> That is their answer.
>> Therefore it appears that you are shooting from the hip trying to make your
>> point. Chuck B
>>
> Gary
>
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