replacing a radiator valve
Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

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macthebike
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replacing a radiator valve

Post by macthebike » Thu Jan 01, 2009 12:40 pm

Hi, I have a leaking valve in an upstairs room, on a combi boiler system.
Is there a way of replacing the valve without draining the whole system ? And is draining a combi system the same as for a conventional one?
Thanks

Steve the gas
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Post by Steve the gas » Thu Jan 01, 2009 3:34 pm

Hi,

Before you go drastic, what valve is leaking and where from?

htg engineer
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Post by htg engineer » Fri Jan 02, 2009 12:31 pm

Where is it leaking from ?

You'll have to drain the system to change the valve, but pressurised systems are easily drained and refilled - no problems with airlocks like older systems.

You could freeze the pipes to change the valve but i'd rather drain the system.


htg

macthebike
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Post by macthebike » Sat Jan 03, 2009 8:10 pm

Hi Steve,
It`s a radiator wheelhead valve. Thanks for replying.

Steve the gas
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Post by Steve the gas » Sun Jan 04, 2009 8:12 am

If it's leaking from the nut/olive connection to the downpipe - have you tried tightening it up?

macthebike
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Post by macthebike » Sun Jan 04, 2009 8:37 pm

[quote="Steve the gas"]If it's leaking from the nut/olive connection to

Hi Steve, It`s a leak from just below the projecting bit that turns when you screw the cap. There are two hexagonal nuts below this and the water seems to come from the top one. Should I tighten the lower one and then the top one to see if this cures it ? Or maybe lock the top one against the bottom one (2 spanner job) ?.......Thanks for help so far.

Steve the gas
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Post by Steve the gas » Mon Jan 05, 2009 5:33 am

Yes, try as you describe.

macthebike
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Replace Radiator Valves

Post by macthebike » Tue Jan 06, 2009 9:41 am

Hi Steve,
I tightened the nuts....it still leaks . So is it a full draindown situation ? It is a Glow Worm Compact, which I believe has to be done with care. Any tips ? Cheers

Steve the gas
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Post by Steve the gas » Wed Jan 07, 2009 6:06 am

If you have the manual follow it.
If not,isolate boiler from power and water, find a suitable drain cock (lowest point), attach hose to outside,open drain cock.FIT NEW VALVE.
After draining,close drain cock, open filling loop , while another body bleeds rads, keep refilling up to 1 - 1.4 bar. Voila!

HTH

macthebike
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Replacing valve

Post by macthebike » Sat Jan 10, 2009 4:07 pm

Thanks, Steve.
In the end I solved it by removing gland nut and windind PTFE under it.
Cheers, Mac

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