Auto air vents (plumbing)
In message , Andrew Gabriel
writes
In article ,
Tim Lamb writes:
In message , Thomas Prufer
writes
On Mon, 26 Mar 2018 20:09:26 +0100, Tim Lamb
wrote:
As heading. I now have 2 vents out of 6 which dribble water when
unscrewed.
Any thoughts?
That means four aren't working as designed -- AIUI they are crap and will all
leak eventually.
I plan to screw them all shut once the air is fully out of the system.
I found a couple of U tube videos giving a clear explanation of the
purpose and ideosyncracies.
The ones on the manifolds are probably safe to remove as all the pipes
are at a lower level and there are isolating ball valves.
The plumbers have fitted two further vents on vertical legs which can
probably be removed once the system is depressurised.
I'll have a go when the moment arrives.
The float type ones can't be left open. They seal on a wet surface,
which will dry out on the open side leaving some scale. That will
eventually stop them from sealing.
Leave them open for a few hours after filling the system, and then
close them.
You might be able to recover them by descaling the sealing surfaces.
There has been a fair bit of air to get out! I did the hose pipe to the
bog twice for each underfloor circuit. Probably 20 gallons through each
loop. The boiler is run for a few hours at 60 deg. C output which allows
me to warm up the floors nicely. I have been worrying how much the
system pressure drops back during the cool down overnight period
(possible screws through pipes) but today it has held up.
--
Tim Lamb
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