I think I got them for around £9 when buying them together
with the radiators. This was from a small independant (AFAIK)
plumbers merchant in the high street (who for reasons I don't
understand, often puts the bits into a plumbcenter bag).
That reminds me -- I keep meaning to find a supplier for the
adjusting tool which allows you to use them for flow balancing
Has anyone done this? The instructions say you can only turn
the adjustment one way, but I presume if you go too far, there's
some way back, like turning it all the way round again or
something? Instructions don't say.
On Mon, 8 Dec 2003 10:16:37 +0000 (UTC), Danny Monaghan
Westherm, I think. I have a mix of them and some cheapies from B&Q, all
were about £6. After 6-7 years, none have leaked and the one or two that
seem to be inaccurate have been like that for some time.
Have never known them leak. Have known them stick shut, over summer in a
badly sludged system, but they are easily unstuck without the need to drain
down and with no more than a few cc of water spilt.
That will be 2d please.
1. Ensure that the system pump is not running.
2. Remove the TRV sensor head.
3. Unscrew & remove the 'gland seal' - this is the central hex headed
brass assembly which holds the actuator pin. The innards of the
valve are now exposed and a slight seepage of water is usual at
4. Using something small and round, such as a small electrical
screwdriver, feel inside for the recess that the actuator pin
engages with; this is one end of a rod with the valve cone on its
other end. _Gently_ attempt to push this rod from side to side with
a circular or waggling motion, increasing the force applied until
you start to feel the valve un-stick. The internal spring does the
rest and the rod will pop outwards by a few mm, accompanied by a
little gush of water (have old towels ready).
5. Quickly replace the gland seal and tighten.
6. Press on the actuator pin and ensure that it returns under spring
pressure - you can easily distinguish between stuck and unstuck
valves by the feel of their pins.
7. Replace the head.
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