Auto Air Bleed Valve
John
I was getting a lot of air gurgling around in my system despite bleeding the
rads every day.
Took a look at the boiler - it has an auto bleed valve. Poked a blunt pin
into the hole and must have dislodged some crust of something - air came out
for about 5 minutes - now the valve seems to be weeping water.
Might it recover - how do they work?
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Regards
John
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Andy Hall
<john.plant90@NO-SPAMntlworldDOTcom> wrote:
>(I had no response to earlier note - Worcester Highflow!)
>
>I was getting a lot of air gurgling around in my system despite bleeding the
>rads every day.
>
>Took a look at the boiler - it has an auto bleed valve. Poked a blunt pin
>into the hole and must have dislodged some crust of something - air came out
>for about 5 minutes - now the valve seems to be weeping water.
>
>Might it recover - how do they work?
It may seal up with crud again but I wouldn't count on it. Often
valves like this or pressure relief valves build up a deposit or are
subject to some corrosion.
Most AAVs have a chamber with a float - rather like a tiny toilet
cistern without the flush. When air finds its way into the chamber,
the water is displaced and the float drops, opening a vent. When the
water comes in the float covers the vent hole.
Some of them can be taken apart for cleaning, it depends on the type.
Either way it will be a drain down job and either clean or replace.
.andy
To email, substitute .nospam with .gl
IMM
"Andy Hall" <an...@hall.nospam> wrote in message
news:8lpetv85d20ior1hj...@4ax.com...
Some can be taken off the system without a drain down.
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Andy Hall
>
>"Andy Hall" <an...@hall.nospam> wrote in message
>news:8lpetv85d20ior1hj...@4ax.com...
>>
>> Some of them can be taken apart for cleaning, it depends on the type.
>> Either way it will be a drain down job and either clean or replace.
>
>Some can be taken off the system without a drain down.
>
Yes, you're right, I realised that after I had posted - I have some of
them so I should know.....
The Honeywell ones, for example. have a second valve in the base which
closes as the body is unscrewed.
Whether that type would be fitted inside a boiler, I'm not sure,
though....
>
>---
IMM
"Andy Hall" <an...@hall.nospam> wrote in message
Some are.
John
I will be looking for a replacement tomorrow. In the meantime the
toothpaste tube cap is keeping things dry.
--
Regards
John
"John" <john.plant90@NO-SPAMntlworldDOTcom> wrote in message
news:XjJBb.430$526....@newsfep4-glfd.server.ntli.net...
Andy Hall
<john.plant90@NO-SPAMntlworldDOTcom> wrote:
>Thanks for your help - is it likely that I have punctured the float?
>
It could be, or simply the vent. Generally there is a little rubber
cap which covers the hole on the inside. It could simply be that
you've scratched that.
>I will be looking for a replacement tomorrow. In the meantime the
>toothpaste tube cap is keeping things dry.
.andy
Dave Liquorice
> Whether that type would be fitted inside a boiler, I'm not sure,
> though....
I wouldn't have thought so, gets rather hot inside a boiler casing.
The air valve on our (38KW Oil) boiler is of the fibre washer type.
Can I find one on the web? Nope, they are similar to:
http://www.screwfix.com/app/sfd/cat/pro.jsp?ts=91964&id=19155
Except that the just below the thumb screw is a ring of holes, through
which you can see a fibre washer. When the washer dries out it shrinks
letting out the air, it gets wet expands and seals simple and
effective.
--
Cheers new...@howhill.com
Dave. pam is missing e-mail
John
(through linkages) presses a rubber nipple onto a small seating. As with a
ball valve, the rubber had pitted a bit (probably helped by my probing with
a pin!)
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Regards
John
"Andy Hall" <an...@hall.nospam> wrote in message
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