Imperial Size Thermostatic Radiator Valves

[Colin Devonport]

I am hoping that someone can help me. I would like to replace the valves on
7 radiators on a single pipe system with thermostatic valves

The current fitting is 1" BSP (outlet) attached to a 3/4 inch pipe with a
compression joint.

I have tried various manufactures web sites but either cannot find what I
need or perhaps I get lost with the jargon.

Any suggestions? Thanks in advance.

Colin Devonport

[Ed Sirett]

Colin Devonport wrote in message <966j33$t74$1...@newsg3.svr.pol.co.uk>...

I'm picturing a CH system here a bit like the ones I used to see at
school in the 60's. Cast iron rads fed with Iron pipes or copper pipes?

Whilst it is quite possible to make up fittings to connect standard
thermostatic valves (15mm compression on pipe to 1/2" BPS in the rad)
I'd be a bit concerned that the valves would be impose too much
restriction on the flow even when fully open and you might not get the
output from the rad you need.

In principal you'd simply need a reducing bush 1" to 1/2" for the rad
connection, or two connected together 1" to 3/4" and 3/4" to 1/2".

At the other end you'd probably need an 3/4" to 15mm coupling and a
short length of 15mm copper pipe to join onto the new valve.

Then there is the problem if the pipes postions don't work out...

Ed Sirett
Property Maintainer - North London.

[ian_c...@my-deja.com]

Colin Devonport wrote:
>
> I am hoping that someone can help me. I would like to replace the valves on
> 7 radiators on a single pipe system with thermostatic valves

Hi

I've never seen 1", but I'd imagine the commercial systems people like
Honeywell would do them. A glance at the tech literature at your local
plumbers merchant should track down what the part number would be.
Honeywell's tech line (via their switchboard on 01344 656000) is usually
pretty helpful, as long you can make them think its a trade enquiry.

When ordering or comparing prices remember that at this size some of the
manufacturers supply the body and head as different parts, so you need
to order one body and one head for each rad. Part of the reason for this
is that you can get temper-resistant heads, different temp range heads,
remote sensing heads, etc. Depending on your application some of these
things might be useful for you.

Drayton do their TRV4 (which I think is a nice looking unit) in 3/4"
straight or angled, and I think Danfoss do a 3/4" as well. These plus a
reducing bush should enable you to fit them.

Finally, my B+G catalogue lists Clyde as manufacturers of cast iron
column rads. They might be able to help, since I imagine your
application is similar. I don't have a number for Clyde, but B+G HO on
01932 233100 could probably give it to you. B+G are actually a pretty
good plumbers merchant themseleves, and may be able to sort you out if
you're in their S London supply area.

HTH
IanC