As heading. I now have 2 vents out of 6 which dribble water when
unscrewed.

Any thoughts?

How do they work anyway?
--
Tim Lamb

On Monday, 26 March 2018 20:12:30 UTC+1, Tim Lamb wrote:
As heading. I now have 2 vents out of 6 which dribble water when
unscrewed.

Any thoughts?

How do they work anyway?
--
Tim Lamb

They have a little float in them. If air appears, it falls ans opens a valve in the top.

You can dismantle and clean any crud out and clean the valve seat and needle. (They can stick a bit or get something on the valve seat.)

on 26/03/2018, harry supposed :
They have a little float in them. If air appears, it falls ans opens a valve
in the top.

You can dismantle and clean any crud out and clean the valve seat and
needle. (They can stick a bit or get something on the valve seat.)

I have come across another type, where a material gets wet, causing it
to swell and thus acts as a valve.

Harry Bloomfield Wrote in message:
on 26/03/2018, harry supposed :
They have a little float in them. If air appears, it falls ans opens a valve
in the top.

You can dismantle and clean any crud out and clean the valve seat and
needle. (They can stick a bit or get something on the valve seat.)

I have come across another type, where a material gets wet, causing it
to swell and thus acts as a valve.


+1
--
Jim K


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http://usenet.sinaapp.com/

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.


Thomas Prufer

On 26-Mar-18 8:42 PM, Harry Bloomfield wrote:
on 26/03/2018, harry supposed :
They have a little float in them. If air appears, it falls ans opens a
valve in the top.

You can* dismantle and clean any crud out and clean the valve seat and
needle.* (They can stick a bit or get something on the valve seat.)

I have come across another type, where a material gets wet, causing it
to swell and thus acts as a valve.

That is the type I know. They use the same type of fibre that is used
for sealing washers in water systems. They seem to be very reliable.

--
--

Colin Bignell

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.

Thanks all

--
Tim Lamb

Tim Lamb Wrote in message:
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.

What if they don't just allow "air " out?
--
Jim K


----Android NewsGroup Reader----
http://usenet.sinaapp.com/

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.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

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