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Home heating automation
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The big issue is if your old valves are Union type, with a big nut on the valve to the 'tail' pipe screwed into the radiator.It is over half a day's worth of work I think. I'd be looking at 200-300? I could be off by a fair bit though.
If the TRV valve has the same union connection to the rad tail, and the same 1/2" compression nut to the rising pipe, with the nut of the same thread gauge, then you'd just need to drain the system and swap the valve body for the similarly connected TRV body.
Unfortunately, it's unlikely to be that easy. Virtually all TRV valve bodies use a compression fitting, not a flush union, at the rad end. This require removing the old valve tail from the rad, often seized and stuck. At the rising pipe end, the existing valve nut is unlikely to be a match in thread gauge or depth to the compression fitting on the TRV valve body, so the old compression nut and it's compressed ring have to be removed from the rising pipe, time consuming. I've only ever seen one TRV valve body, a Drayton one, with a union fitting to the rad, and this is sold complete with manual TRV head, for a whopping £44/€50, and It has only 3/4 thread on the pipe end, requiring a compression fitting adapter.
Replacement compression TRV valve bodies can be bought for as little as £4/€5.
https://www.stevensonplumbing.co.uk/myson-trv2way-valve-body.html
These take a bit of work as described above, I experienced difficult to remove union rad spigot, and mismatch of thread on the riser compression nuts, requiring replacement of the nut and ring. Plumber could easily spend a day on ten rads, but as least the bodies are cheap.0 -
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Hi,
I'm considering buying the Tuya ZigBee Radiator Valves but I'm not sure if they will fit on my radiators.
From what I read there seems to be three types of radiator valves that the Tuya ones can fit to, namely, RA, RAV and RAVL. I could be wrong about this, so please feel free to correct me.
So will they fit on my radiators. I don't know what type of valve I have on my radiators so I attach a pic.
Thanks
No, your rad valves are rotary type, like a tap, not suitable for any brand of TRV. TRV valves are a push down pin valve. You'll need to change the valve bodies on your radiators on one end of each rad. See my previous post #2149
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No, your rad valves are rotary type, like a tap, not suitable for any brand of TRV. TRV valves are a push down pin valve. You'll need to change the valve bodies on your radiators on one end of each rad. See my previous post #2149
Thanks very much Deezel you have been very helpful.
Can I ask is this what I'd have to change them to:
https://www.stevensonplumbing.co.uk/...alve-body.html
and why only on one end - is it the end where you control the heat from i.e. turn on and off?
Thanks0 -
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Thanks very much Deezel you have been very helpful.
Can I ask is this what I'd have to change them to:
https://www.stevensonplumbing.co.uk/...alve-body.html
and why only on one end - is it the end where you control the heat from i.e. turn on and off?
Thanks
Just one end, youll only fit one TRV on each rad, the lockshield valve at t'other end is left on and open.
That valve body in the link is 1/2" compression both sides, which your rotary valves appear to be, so if the compression nuts' threads are a match, then it could be an easy swap, re-using the existing nuts already retained on the pipe riser and the rad spigot. Experience tells me even then the thread depth and pipe insert distance can differ, meaning the new body may not seal even if the nut thread gauge is the same, neccitating the removal of the old compression rings from the rad and riser in order to use the new body's nuts. Tedious and tricky for a DIYer.
As regards the body type, that one is a standard M30 thread by 1.5mm depth. Most manual or smart TRVs will fit straight on retrained by the TRV screw ring. However, the Chinese TRVs you are contemplating seem to be manufactured with Danfoss RA clamp on fittings. You would require Danfoss RA valve bodies for a direct fit, such as these.
While it is possibly to adapt these valve bodies to take M30 x 1.5 TRV heads, I'm not certain if you can get the reverse adaptor, RA TRV heads to the common M30 threaded valve body, so if you buy these heads you will need these valve bodies.
Apart from the cost and difficulty of obtaining and fitting these RA bodies, (they dont have a pipe compression fitting, just a f/m 1/2" pipe thread, requiring a brass adaptor, and your rad spigots will need removing), your'e making your TRV bodies off standard for most other TRV heads, requiring plastic head adaptors if you were to later fit Tado or Wiser or other M30 x 1.5 heads. That would look really ugly, with an M30 TRV to an RA adaptor to a RA valve body to a 1/2" gb-to-compression adaptor to your rising pipe.
There must be plenty of low cost TRVs with the M30 fitting, I'd avoid the ones you're considering which are likely manufactured as an electronic upgrade for existing RA bodied Danfoss installations.
Here's a link to Tuya M30 equipped Zigbee TRVs, this is what you want, they'll fit straight to those inexpensive M30 replacement valve bodies.
https://www.aliexpress.com/i/4001039187695.html0
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