Guys,
How do these bottle air vents work? Tried to search on the web and can
find nothing. I have just bought one and when I shake it something solid
rattles inside. I am replacing the one that is seized up and sits at the
top of a piece of pipe in my airing cupboard. Does the rattling bit press
against something internally when full of water?

It has 3/8 connection and a sort of twist valve at the top (like the top
of a biro pen). Should that twist valve bit be screwed tight or loose?

Thanks, Steve

On Jan 6, 10:13 pm, Kaiser Sose wrote:
Guys,
How do these bottle air vents work? Tried to search on the web and can
find nothing. I have just bought one and when I shake it something solid
rattles inside. I am replacing the one that is seized up and sits at the
top of a piece of pipe in my airing cupboard. Does the rattling bit press
against something internally when full of water?

It has 3/8 connection and a sort of twist valve at the top (like the top
of a biro pen). Should that twist valve bit be screwed tight or loose?

Thanks, Steve

The rattly thing is a float, which seals the air outlet when the bottle
bit is full of water. When it fills with air, the float drops, air is
released.

The twisty bit is a cap, like on a tyre valve. Usually it's left open
for a week or two after filling to allow all the air to escape and then
screwed shut. If the system is installed correctly and has inhibitor in
it, you should not get any appreciable amount of air inside the pipes.
The AAVs can stick open, if they get a bit of crud under the valve, so
it's not advisable to leave them permanently open.

On Sat, 06 Jan 2007 16:13:42 -0600, Kaiser Sose wrote:

Guys,
How do these bottle air vents work? Tried to search on the web and can
find nothing. I have just bought one and when I shake it something solid
rattles inside. I am replacing the one that is seized up and sits at the
top of a piece of pipe in my airing cupboard. Does the rattling bit press
against something internally when full of water?

It has 3/8 connection and a sort of twist valve at the top (like the top
of a biro pen). Should that twist valve bit be screwed tight or loose?


They work much like a carbuterttor float valve but are used in reverse. If
they contain liquid the float shuts off the vent.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards