TRV compression joint

[wilgartw]

a Drayton 247406 trv integral head with 1/2" angle. 0705153

 

[terryplumb]

Why are you not fitting the Drayton ?

 

[wilgartw]

Drayton TRV4 integral head with 1/2" angle 07 05 153

 

[terryplumb]

Yes ,I read it the first time. Why are you not able to fit it. That valve has a standard compression fitting to the supply pipe ???

 

[wilgartw]

the Drayton has the same fitting to the copper pipe. the photos were of the Drayton.
if I could get a TRV with a 3/4" tail fitting and 15mm compression that would solve my problems, but the plumb centre said this was the only one with the 3/4" tail fitting.

 

[terryplumb]

Oh ,I thought the valve in your pics was the original. Sounds like you have the commercial version of the 0705153 .

 

[wilgartw]

I'll go back to the plumb centre tomorrow, now I know a bit more, and either get the correct one or get a refund.

I should be able to get a 3/4" tail outlet with standard 15mm compression, do you think?

 

[terryplumb]

Are you trying to marry up a new valve to the old ones 3/4 union that's still attached to your radiator ?
If so there is a good chance they will not be compatible.

 

[wilgartw]

thanks for your patience. the radiator has a threaded hole for the tail that is I assume 3/4" (approx 20mm) , the copper pipe from the boiler is 15mm. . the tail that is currently fitted has a male 3/4" thread and a self sealing 1" nut.
I want a trv body and tail that connects the copper to the radiator. I don't really care how it is done.


.

 

[wilgartw]

I am thinking this would solve any issues.
https://www.heatingcontrolsonline.co.uk/34-to-12-bush-for-radiator-p-580.html

it will mean my radiator can use a 1/2" tail and then almost any trv will fit.

 

[terryplumb]

20 mm hole in the rad is 1/2 inch BSP thread.
So any TRV that has a 1/2 in.BSP threaded tail ,and a 15 mm compression fitting on the supply pipe inlet will suffice.
You just need to remove the existing tail. And you will need PTFE tape to fit the new tail.

 

[wilgartw]

yep I've removed the existing tail, I am confused that 20mm is 1/2" but I am happy if that is the case. .

 

[terryplumb]

Half inch bsp Thread isn't measured by the diameter of the hole.
Measure the 3/4 thread on your Drayton it's nearer 1 inch diameter.

 

[wilgartw]

yes, I have just been reading up on bsp sizes. I am a metric kid (born 71) and it is things like this that really confuse me give me a M20 bolt any day.

But now I understand that I will go back to the plumb centre and get what I need.

Thank you for all your help. I really appreciate it, sorry it took so long to get there.

 

[terryplumb]

As long as you get there in the end ,all's well