Just been discussing the 2-port valve idea on another forum.
The simple answer is to power the valve from the pump supply, and then power the
pump from the switched output of the valve (which energises once the valves is
open).
Sounds like a winner to me !


--- In UK_Selfbuild@..., Nick Laurie <nwlaurie@...> wrote:
>
> You'd also want to arrange a delay between valve and pump so that the
> pump doesn't find itself pushing against a closed valve.
> Nick
>
> Nick Laurie PC Repairs
> nwlaurie@...
> Skype: nicklaurie
> 01458 250834 and 07941 731056
>
>
>
>
>
> On 7 Jul 2009, at 21:29, Eric MEARS wrote:
>
> >
> >
> > That would indeed cure the heat loss - but have you calculated the
> > payback
> > period ?
> >
> > I haven't done so either but suspect that it might be quite a while.
> >
> >
> >
> >
> > Regards
> >
> > Eric Mears
> > CHESTERFIELD
> > Derbyshire
> >
> > -----Original Message-----
> > From: Lee
> > Sent: Tuesday, July 07, 2009 9:15 PM
> >
> >
> > The solution as far as I can see is to fit a 2-port motorised valve,
> > powered
> > by the UFH pump supply, so when the pump is off, the pipes are closed.
> >
> >
> >
> >
> >
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