I have an outside tap, currently fed from the mains.
I have a combi-boiler.
I want to be able to switch between hot and cold water to the outside tap.
I don't want to actually mix the hot and cold - I just want to electrically
switch between the two supplies to the tap.
I think that is the way I am going to go. Thanks to you and all others with
their comments and suggestions.
I have looked at motorised valves - and it would seem that there is a danger of
them "wearing" out. I think I would like to try a simple solenoid type valve
- which is only activated when needed. So - normally closed - apply the power
and the solenoid opens. I am guessing that these are different from
"motorised" valves which appear to have limited life and a finer adjustment
(not just on or off) : or is it just a different name for the same thing?
Any further suggestions/comments on solenoid valves would be appreciated.
(PS I am not actually going to DIY it - I am looking for ideas/components which
I can discuss with a professional when I am ready to go)
Again: thanks to all for comments - appreciated.
A motorised valve only takes current while it operates - moves from open
to closed or the reverse.
A true solenoid valve would need power all the time it was in one state,
or some form of latch mechanism to hold it after it's moved.
Think central locking in a car. At one time this did use solenoids. But
these days invariably motors.
Motors are also more efficient than solenoids.
*I started out with nothing... and I still have most of it.
Dave Plowman firstname.lastname@example.org London SW
Not generally true for the sort used in heating systems. They have a
spring return and close as soon as power is removed. To keep them open,
the motor needs to be continuously powered - and simply stalls.
Since the OP wants to feed an outside tap, that will presumably only use
water for short periods, so requiring continuous power during 'on'
periods shouldn't be a problem.
CH-type motorised valves are not designed for mains pressure, whereas
the solenoid valves used on washing machine inlets *are*. A couple of
these from a scrap hot & cold fill washing machine would probably do the
job as long as you can find a way of connecting them. The ones I've seen
have a 3/4" male BSP thread on the inlet side - which is easy to connect
to - but the outlet side feeds into a chamber, so it would be necessary
to make a housing of some sort with a pipe connector on *its* outlet in
order to use the valves in an in-line situation.
It's also not true, in the common case of spring-return motorised valves.
I agree, having checked, that CH valves are no good as one quotes a max
differential pressure of 0.7bar
Lists quite a few and one is fine up to 9.8bar.
The other question is: does the OP care if the valve is approved for
Possible the cheapest source of electrically controlled valves
would be from a scrap washing machine.
You should probably also make sure you fit non-return valves to
prevent any chance of back-flow.
Chris J Dixon Nottingham UK
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.