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I've isolated the trv end and lockshieds end to remove a radiator, however the the trv is still aklowong drips of water to cone through. How do I stop it completely?

It's coming from the main inlet pipe face

Thank you

Thanks
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
1/2 blanking cap end should sort you out
 
OK thanks, will do that. Is there any reason to be concerned if the d trv does not seal fully for future reference
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Some trv s don’t totally could be either the head isn’t on correctly/ fully tighten
 
Fair point. Is it best to take the trv head off and unscrew fully to an open position from * to 7 and then replace back onto the needle head at position 7bwhich is fully open?
 
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ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Fair point. Is it best to take the trv head off and unscrew fully to an open position from * to 7 and then replace back onto the needle head at position 7bwhich is fully open?
yes and tighten the collar down then switch / turn the trv off but don’t do it now else you will flood yourself :D
 
Just bought 1/2 inch blanking nut but is too small, I think it should be 3/4 to screw directly onto the threaded trv open end, is that correct?
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Just bought 1/2 inch blanking nut but is too small, I think it should be 3/4 to screw directly onto the threaded trv open end, is that correct?
trv will be 1/2 lockshield will be 3/4

1/2 should measure around 20mm od
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
you are correct its 3/4 never seen a trv in domestic with a 3/4 nut
 

Stigster

Esteemed
Plumber
A 3/4 blanking cap should fit that thread but I cannot absolutely guarantee that. Like Shaun says, I too have never seen a 3/4" TRV outlet in a house before but there it is, looks like that's what you've got.
 
That's a good way to overcome the problem. Well done!
Before I redose with sentinel X100, is there any point in putting in a cleaner, emptying and then dosing. Clean water came out of the rad and only dark black fine debris water came out of the holes in rad.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
I wouldn’t just dose with x100
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Just add x100 when your finished
 

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