Isolating radiator valve

[Mikefearn83]

Hi.

I'm having some issues with removing rediators for decorating. I cannot seem to isolate the value where the TRV was. The value itself doesn't seem to isolate it and taking it off and turning it doesn't either. All I get is water gushing out when I open the radiator nut.
I've attached some photos.

Any ideas please. Thank you.

 

[Mottie]

As it is, that’s fully open. You need a decorators cap for it. Either that or try to refit the head with a 5p piece between the valve and head and then close it off.

 

[Mikefearn83]

Ahh OK Can it not be isolated without capping. Do I have to drain the system to be able to cap. Thank for the help.

 

[Mottie]

The cap just replaces the thermostatic head and completely closes the valve off. Something like this, depending on the make of your valve. https://www.ebay.co.uk/p/MYSON-Commissioning-Shut-off-Cap-for-TRV-2-way-Thermostatic-Radiator-Valve-30mm/2255797337?iid=292114797294&chn=ps&ul_ref=https%3A%2F%2Frover.ebay.com%2Frover%2F1%2F710-134428-41853-0%2F2%3Fmpre%3Dhttps%253A%252F%252Fwww.ebay.co.uk%252Fp%252FMYSON-Commissioning-Shut-off-Cap-for-TRV-2-way-Thermostatic-Radiator-Valve-30mm%252F2255797337%253Fiid%253D292114797294%2526chn%253Dps%26itemid%3D292114797294%26targetid%3D539569954441%26device%3Dt%26adtype%3Dpla%26googleloc%3D9044948%26poi%3D%26campaignid%3D1464306438%26adgroupid%3D57952832158%26rlsatarget%3Dpla-539569954441%26abcId%3D1139096%26merchantid%3D101768774%26gclid%3DEAIaIQobChMIweXuiY623gIVCLTtCh3J5A2CEAQYAiABEgLdZfD_BwE%26srcrot%3D710-134428-41853-0%26rvr_id%3D1726223542005%26rvr_ts%3Dd537c2991660ac797190afd7fff5b688

As said, some TRV’s don’t completely shut off but as long as you wedge something between the valve and head (most use a 5p piece), you should get the extra needed to fully close it.

 

[Mikefearn83]

OK.

So I cannot manually turn the value at the top once the TRV is off to isolate it.

 

[ianmcd]

yes you can but as said if the temperature drops the valve will open so see if you can what is called a decorators cap that fits your valve

 

[45yearsagasman]

Don't forget to turn off the valve on the other side of the rad

 

[Mikefearn83]

Thanks for the help guys. Appreciated