Taking radiator off, trv won't turn off.

[Riley26]

If a trv won't turn off fully when trying to take a radiator off. And you don't have a plastic cover that you can screw on instead of the trv that will fit .is there anyway around a drain down?

 

[Newboy]

Put a 5p piece between the valve pin and the actuator

 

[terryplumb]

Freeze the pipe ,fit new valve.

 

[45yearsagasman]

If it's an open vent system, then use the bung method.

 

[durhamplumber]

Welcome to plumbersville.I prefer the carrot and potato method

 

[Riley26]

Thanks, why do some trvs not turn off properly? Is it a frost setting?

 

[D_Hailsham]

Thanks, why do some trvs not turn off properly? Is it a frost setting?

The frost setting is normally show by a * and the off position by a 0. If the lowest setting is a * the valve will never turn of completely. A decorators' cap (normally supplied with the TRV), or the 5p trick, will do the job. If you have to use a 5p, set the TRV to max before replacing it. Then turn the TRV down slowly until it won't turn any more.