The reason that I replaced my lockshield valves was because the system
had previously been open vented and upon pressurisation there was
seepage from some of the valves. They were poor quality anyway, so
I decided to resolve by replacing them.
You could certain start this way. However, if the system is really
full of crud then you run the risk of pushing some into the boiler.
If that happens, you need to be very sure that it gets flushed
You could certainly start with one radiator and see how bad it is.
If a lot of sludge comes through, then trying to clear them in situ is
probably not going to be effective and you will spend a lot of time
running round getting all the muck out.
I did about 15 radiators in a morning of removing, fliushing, swapping
valve and replacing. If you organise the procedure it is quite
If you put a double check valve on the hose connector at the tap, that
can't happen. The filling point also ha one of these (or should
To email, substitute .nospam with .gl
On Tue, 21 Oct 2003 23:24:06 +0100, Andy Hall wrote:
[ .. ]
The Flow and Return pipes at the boiler both have isolating valves.
Perhaps I could protect the boiler by closing both valves, then fully
opening the by-pass valve - thus forming a closed circuit for the CH but
isolating the boiler. Might that work?
In the end I think I probably shall do this. The 'thorougness' of the
procedure appeals to me. Although I'm a little concerned about getting the
upstairs rads down the narrow staircase to get to the garden to flush them
out. Presumably it helps to have a helper for this.
On Mon, 20 Oct 2003 21:59:06 +0100, Andy Hall wrote:
[ .. ]
I tried one of those mastic gun cartridge affairs a few months ago. I
bought it in B&Q and carefully read the instructions. I had high hopes for
improving the health of my CH system but it all ended in tears and neither
the CH system or I enjoyed the experience very much. Despite carefully
following the instructions the inevitable result was a lot of swearing and
sad little puddles of vulcan blood on the kitchen lino.
The thought of tipping a dose of cleaner or inhibitor at no pressure into
the bathroom rail cap (what's it called?) sounds far less stressful all
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