TRV stuck?

[jellyfinger]

How much pressure should the TRV pin need to close it? (or spring back with)

Just to give some background...

I have got a problem with a rad not getting hot, it has been switched off until recently and now I have opened up the TRV but no heat, although the feed pipes running underneath are hot (and the next rad in the loop is hot)

I have tried bleeding and got a 2 or 3 seconds of hissing air, and then a dribble, so I think that's all ok.

The balance valves haven't been touched.

So basically after turning the TRV back up and getting nothing, I have removed the thermostat to check for a stuck pin but it moves freely, but if I push it in it doesn't really spring back, I have to pull it out... is this right?

Thanks for any help you can give.


-----edit-----

having just re-read my post.....

What I'm thinking is that there might be a sealing washer or something stuck within the valve and pulling the pin isn't opening the valve as it should?

 

[Vic Spanner]

Keep whacking the side of it with a large adjustable spanner or hammer until it pops up.

 

[jellyfinger]

aaah, percussive maintenance

On a completely unrelated subject.... how hard is it to knock a TRV compression fitting off the end of the feed pipe, with say, a spanner?

 

[twgas]

depends how tight it was, tighter = harder, also smaller (lighter) spanner = harder

 

[Softus]

To free the pin, tap it lightly and repeatedly with a small hammer.

You'll have a hard job knocking the olive off a pipe if it's been crimped on - you'll need to cut it off or use an olive puller. Personally, if there's access to the olive I prefer cutting it - very quick, easy and guaranteed to work.

 

[jellyfinger]

Thanks for your replys guys but the question about knocking off the fitting was a joke

Have given it a few goes at tapping it and nothing is moving, I'll just bite the bullet and fit a new valve (or once it's all drained down have a look to see of I can free it internally)

Thanks for your help.