first timer help with TRV and removing the radiator

[wasteddee]

Hi,
Please excuse me if this is a stupid question but i am a complete novice at this having never attempted it before.

I am in the process of tiling my bathroom (floor an walls), On one of the walls is a small radiator with a Caleffi TRV. My dilema is i need to remove this radiator to allow the tiling to be done. I had planned to close both the manual valve and then the TRV buy setting it to zero then drain the water from the radiator an remove it. On reading various forums and watching Youtube videos i understand that the manual valve is not a problem but the one fitted with the TRV could reopen itself as the room temp drops causing the water to flow. I am unable to get hold of the cover to close this valve if i was to remove the TRV so i am left with the following question.

If i turn of the boiler, and turn of the power to the pumps at my hot tank, set the TRV to zero and manually close the other valve would i still run a risk of water pouring out from the TRV end? ( hope that makes sence)

I had also thought about setting the TRV to zero and placing an isolation valve into the body just while the radiator is off.

Put simply i need a 100% safe way to shut the TRV end without drainning the system as i am unable to do that.

Any advice would be a great help.

Thanks.

 

[danplumb]

you just need a 1/2" screw on blank, if you cant get hold of one of them a standard 1/2" compression nut, a 5 pence coin inside the nut and then a 1/2" fibre washer works just as well.

 

[duffin]

try removing the trv head and putting a 5 pence piece in under it. then screw it down as far as it will go.

 

[bolshy]

Your local plumbers merchant or screwfix should be able to provide you with the 1/2" cap, as posted, for a few pence. Fit this on the open end of the TRV, then there's no chance of water escaping if the TRV opens. Shutting down your system won't stop it dumping water through the TRV if it opens.

http://www.screwfix.com/p/compression-blanking-nut-15mm/55441

 

[wasteddee]

Thanks alot for the info guys its much appreciated, i will pick one up tomorrow.
Thanks again.