During re-decoration in my house, I decided to take the radiator off and
somehow manage to break the spindle pin atop the lockshield valve (?).
I managed to take the radiator off with the water turned off but now find it
impossible to turn it back on since there is no grip at all to turn the
head, even with pliers or vice grippers. The thermostat valve (?) /other
side is ok and able to turn that, but I am unable to turn the head on the
return pipe valve?/lockshield valve?.
I feel I will probably have to replace this lockshield valve(?) in order for
me to get it operational. I have scoured the internet on advise for
replacing this, or to find an alternate way to turn the head back on, but I
can't seem to find any information on this.
Can someone advise on how I can go about turning on this valve or how I can
go about replacing it (and if it is possible for me to replace it - I am a
Any help on this matter will be appreciated.
There are only two ways (off the top of my head) to replace it. One is to
drain down the system then fit a replacement. The other is to use one of
those freezing kits which will avoid the draining down but I've not used one
so I can't advise you on how to use one. Once you've isolated the water to
that part of the system then it's just a matter of undoing the nut holding
the valve to the pipe and remove the valve. The olive and nut will probably
stay on the pipe and can be reused on the new valve or knocked off and
replaced with the bits that come with the new valve.
One thing though. Some systems are pressurised and don't use a header tank.
There is a different technique for refilling these which someone with more
up to date knowledge than me will probably nbe along to explain in a bit. If
you have drained down the system then it is as well to buy some inhibitor to
put in the tank before you refill.
Has the spindle broken off flush with the top of the valve? If it hasn't you
may be able to file a slot in it an use a screwdriver to open it.
You know it\'s a bad day when even the aubergines are plotting against you
Thank you for the quick response.
I've tried to file a slot so I can try turning it with a screwdriver, but it
still doesn't work; The valve seems to crumble whenever I try to turn
it.There just isn't enough grip to turn it.
I think the only option left is for me to replace the valve either by myself
or get an expert in to replace it.
You mentioned that in order to replace this valve, I would have to drain the
system. Can you advise what is involved with that? - Is it a case of turning
off the mains water supply and draining the water from the tank? What would
need replacing - is it the bolt that holds the spindle? Or is it the whole
interface between the pipe and the radiator? Also, how do I find this tank
to put the inhibitor in?
Thanks in advance
To replace valve....
Buy the bits you need and check they're right size etc. Then make sure HW
cylinder is hot (cos you won't have any way of heating it for a while).
To drain system, make sure CH is completely off and can't come on. Then tie
up ball cock in smaller of the two header tanks in loft (to stop it
refilling). Locate drain off cock - lowest part of CH piping on ground
floor (Just conceivable this may be outside). Connect hose securely to
this, and feed to outside drain. Open drain cock, open a few upstairs
rad-bleed valves (but not until water level is below bleed valve level. You
can either shut off both ends of each rad before doing this (speeds up
draining, and save water) or (preferable IMHO) open both valves fully on
every rad so all old water is replaced.
Others here can advise on whether (and how) to flush through entire system
while you're at it.
When all done (i.e. valve replaced), shut off drain cock, open all rad
valves, shut all bleed-valves, release ball-cock. Allow to refill - adding
inhibitor to header tank, if you wish (daft not to). Have a mate standing
by, so one can check if your handywork is leaking while other trickles in
inhibitor. Bleed radiators (and keep bleeding them for next few days).
When you're happy the system is full (including boiler - dunno how you bleed
that) turn on CH and see what happens.
Remember you have no heating nor hot water while doing all this, so don't
start the job in the evening!!
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