I have a mixed 1-pipe and 2-pipe central heating system. The 2-pipe
circuit feeds 2 radiators added by a previous owner. It has been
difficult to balance as the 1-pipe circuit hogs all the flow. I have
now added a balancing valve to the entire 1-pipe system which seems to
do the trick. I only had a 22mm compression service valve to hand,
and it is not the best type of valve to make delicate adjustments.

My question is, what sort of valve should I be using to balance a
domestic heating system? I have found double regulating valves in a
web search which look just right, but at over 100 pounds for a 22mm
compression valve they are far too expensive for domestic central
heating.

MJA

"MJA" wrote

I have a mixed 1-pipe and 2-pipe central heating system. The 2-pipe
circuit feeds 2 radiators added by a previous owner. It has been
difficult to balance as the 1-pipe circuit hogs all the flow. I have
now added a balancing valve to the entire 1-pipe system which seems to
do the trick. I only had a 22mm compression service valve to hand,
and it is not the best type of valve to make delicate adjustments.

My question is, what sort of valve should I be using to balance a
domestic heating system? I have found double regulating valves in a
web search which look just right, but at over 100 pounds for a 22mm
compression valve they are far too expensive for domestic central
heating.

MJA

This might just be one of the rare occasions where a gate valve could be
useful.
I know for isolation they are the pits, as they tend to seize shut etc.
But in your case, once the right degree of throttling is set, you won't
touch the thing again.
Also they present less of an inherent flow restriction.
I'll wait for the gate-valve-detestors to come and shoot me down now

Phil

"TheScullster" wrote in message
. uk...

"MJA" wrote

I have a mixed 1-pipe and 2-pipe central heating system. The 2-pipe
circuit feeds 2 radiators added by a previous owner. It has been
difficult to balance as the 1-pipe circuit hogs all the flow. I have
now added a balancing valve to the entire 1-pipe system which seems to
do the trick. I only had a 22mm compression service valve to hand,
and it is not the best type of valve to make delicate adjustments.

My question is, what sort of valve should I be using to balance a
domestic heating system? I have found double regulating valves in a
web search which look just right, but at over 100 pounds for a 22mm
compression valve they are far too expensive for domestic central
heating.

MJA

This might just be one of the rare occasions where a gate valve could be
useful.
I know for isolation they are the pits, as they tend to seize shut etc.
But in your case, once the right degree of throttling is set, you won't
touch the thing again.
Also they present less of an inherent flow restriction.
I'll wait for the gate-valve-detestors to come and shoot me down now

Phil


If you are going to all that bother to fit a valve, then you should fit the
correct one.
A GLOBE Valve. Designed for Flow Control.
A Gate valve is designed only for Shut Off.

Baz

In article ,
"TheScullster" writes:

"MJA" wrote

I have a mixed 1-pipe and 2-pipe central heating system. The 2-pipe
circuit feeds 2 radiators added by a previous owner. It has been
difficult to balance as the 1-pipe circuit hogs all the flow. I have
now added a balancing valve to the entire 1-pipe system which seems to
do the trick. I only had a 22mm compression service valve to hand,
and it is not the best type of valve to make delicate adjustments.

My question is, what sort of valve should I be using to balance a
domestic heating system? I have found double regulating valves in a
web search which look just right, but at over 100 pounds for a 22mm
compression valve they are far too expensive for domestic central
heating.

MJA

This might just be one of the rare occasions where a gate valve could be
useful.

Yes, gate valves are used for this, one per 1-pipe circuit.

I know for isolation they are the pits, as they tend to seize shut etc.
But in your case, once the right degree of throttling is set, you won't
touch the thing again.

Exactly.

Also they present less of an inherent flow restriction.

although in this case, it's there for flow restriction!

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Sep 29, 12:38*pm, MJA wrote:
I have a mixed 1-pipe and 2-pipe central heating system. *The 2-pipe
circuit feeds 2 radiators added by a previous owner. *It has been
difficult to balance as the 1-pipe circuit hogs all the flow. *I have
now added a balancing valve to the entire 1-pipe system which seems to
do the trick. *I only had a 22mm compression service valve to hand,
and it is not the best type of valve to make delicate adjustments.

My question is, what sort of valve should I be using to balance a
domestic heating system? *I have found double regulating valves in a
web search which look just right, but at over 100 pounds for a 22mm
compression valve they are far too expensive for domestic central
heating.

MJA

any type, but maybe best pick a full bore one.


NT

"Andrew Gabriel" wrote

Also they present less of an inherent flow restriction.

although in this case, it's there for flow restriction!

--
True, but the reduced bore ball valves for instance present an "inherent"
flow restriction before you start throttling. So the control offered will
be over a smaller range. Yes I know the purists will say that ball valves
shouldn't be used for flow control!

Phil

In an earlier contribution to this discussion,
TheScullster wrote:

"Andrew Gabriel" wrote

Also they present less of an inherent flow restriction.

although in this case, it's there for flow restriction!

--
True, but the reduced bore ball valves for instance present an
"inherent" flow restriction before you start throttling. So the
control offered will be over a smaller range. Yes I know the purists
will say that ball valves shouldn't be used for flow control!

Phil

I would be inclined to replace a short section of the 22mm pipe with 15mm
(with suitable reducing fittings) and with a 15mm gate valve in the 15mm
section. The smaller pipe *may* provide enough restriction on its own, but
the gate valve would provide additional fine tuning.
--
Cheers,
Roger
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