I fitted new Drayton TRV4 radiator valves to all my rads about 4 years
ago, and already two of them have started leaking where the valve pin
projects from the valve body.
Is this a common problem? Are they fixable or is the only solution to
renew the whole thing? Anyone have a magic solution for doing this
that avoids draining the system (it's an open vented system with a
It probably has an O ring. Some have PTFE packing.
Supposing you can get one, they can be replaced but sometimes they still
It's quite unusual to leak so soon. Have you got inhibitor in the water?
Could be a corrosion problem.
You'll likely end up replacing them. May as well wash the system out and
make sure you have inhibitor in.
Many inhibitors claim to have lubricators as well.
It's a good idea to "exercise" the valves by winding open and closed now and
then. (Keeps the spindle clean)
The best valves BTW have a bellows not an Oring.. Expensive.
Yes system has inhibitor in. I fitted the new TRV's just before a new
boiler was installed, and the whole system was power flushed at that
time (by the boiler installer - qualified plumber).
Looks like I'll just have to replace them. Exercising the valves is a
good tip - thanks.
I did look at the more expensive valves - OUCH! Even the TRV4s are
quite a bit more expensive now than when I bought the last lot.
Donno about fixable but I shoul imagine you can get replacement
inserts. Bit off they have started to leak after just four years. Get
in touch with Drayton and see what they have to
They do work, I've used them when a TRV here got stuck and I wanted
to take the insert out. Just make sure the system has no leaks and
only open it at *one* point at *any* time. There might be a little
spillage so still take precautions to protect carpets/decorations
On Tue, 17 Sep 2013 20:37:36 +0100 (BST), "Dave Liquorice"
Ah yes, I've got a couple of these, I guess I have to plug both the
feed and vent pipes at the tank. The "negative pressure" of the water
won't damage anything in the boiler will it? I've heard tales of
people who have seen hot water cylinders collapse when these plugs
have been used on the hot water side of an open vented system and then
opened a tap at the lowest point!
What "negative pressure"? Nothing is leaving the primary (or
shouldn't...) if anything does it means some thing has got in some
where. The system remains at it's static pressure determined by pure
Well I guess there is the "pull" from the weight of water in the pipe
work below the cylinder. Which in a normal house with cylinder on
first floor and taps on ground could be could be around 8' of head or
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