Every time you introduce water, you are introducing oxygen. If you close
the valve, it becomes a gas and does not leave because there is nothing to
replace it You are not adding water over and over, you are getting a proper
purge of the air and that will not happen as long as the feed valve is
Getting back to the original question:
My point is that the OP has the valve closed and is never truly eliminating
all the air and is probably sucking some in when the system cools. It does
not mean there is a leak as you insist.. If he leaves the feed valve open
for a while, it will correct. Mine did.
That does *not* mean you can keep adding water indefinitely. It's a closed
system. If there is no point at which water can leave the system, it
eventually *must* become full when water is repeatedly added, and when that
point is reached, no more water can be added. If water *can* be added
indefinitely, it *must* be escaping somewhere.
If there is a point in the system where air can be sucked in, there is a point
where water can escape.
I would define a point at which water can escape as a leak.
That's because your problem was nothing more than excess air. *His* problem,
OTOH, is a leak.
Doug Miller (alphageek at milmac dot com)
Not necessarily. Check valves and refielf valves can keep water from
leaving but allow air to get sucked in under a vacuum or pressure
differential. That may be the OP's problem.
Your opinion, not mine. He is doing the same thing I did when the feed
valve was shut off. Mine had air in it for a few weeks until I finally got
around to repairing the valve so it could be left open and the air properly
purged. Right now he is not purging the system properly and air is still in
the system. Perhaps the OP will get back to us and let us know what he
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