Re: Zoned Heating Control

["Peter and Jane" <pandj.munnoch@xxxxxxxxxxxxxx>]

I would worry...TRVs I have seen have a plunger that is operated by a
capsule, the valve being (I guess) diaphragm based. I would expect Laurence
is right, the gland seal on a conventioinal valve might fail rapidly if the
shaft is repeatedly rotated.
UFH control valves are wax capsule based (at least mine are, although there
may be other types). Again push, not turn....
Rgds
Peter
----- Original Message -----
From: Neil Ball
To: ukha_d@xxxxxxx
Sent: Saturday, April 14, 2007 9:57 AM
Subject: RE: [ukha_d] Zoned Heating Control


Should not be a problem as most TRV valves are constantly cycling in any
case with the conventional head fitted. Some TRV valves from the likes of
Honeywell and their rebadged resellers have a replaceable valve insert that
can be removed for cleaning or replaced without draining down the radiator.
The more likely problem is that the valve sticks or gets clogged because so
few people keep the heating system topped up with inhibitor

Neil B.

-----Original Message-----
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On Behalf Of
Mal Lansell
Sent: 14 April 2007 09:16
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Zoned Heating Control

Laurence Mason wrote:

One thing I've been wondering about these kinds of add-on valve motors,
is that most standard radiator valves don't look like they're built to
withstand contant twiddling by a computer. I can easily imagine them
wearing quickly, even starting to leak, after a couple of years of
continuous adjustment. Or am I just being paranoid?

Mal





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