On Thursday, 24 October 2019 15:38:26 UTC+1, NY wrote:
"dennis@home" wrote in message
...
On 23/10/2019 21:31, tabbypurr wrote:
On Wednesday, 23 October 2019 18:15:26 UTC+1, T i m wrote:
On Wed, 23 Oct 2019 16:30:30 +0100, charles

Trouble with spring return vales is they are noisy when they close..

I'm not sure if there any that work like a solenoid but the return
spring jobby I have in my hand right now is near silent in operation
(both ways).

Cheers, T i m

There are 2 types, motorised & solenoid. The latter are cheaper & noisy.
AFAIK both use spring return.

A third type has motorised open and return but the wiring is slightly more
and they cost more.
They are quiet.

I think mine is the third type. It has a little slide lever on the housing
which is spring-loaded.

so obviously the 1st type

If you move it you can feel that it is making a
shaft spin at high speed. There is no indication as to whether it is opening
or closing the valve, and it seems to take about two movements of the lever
to go from fully closed to fully open and then another two to go back to
fully closed. It would have been so much more useful if the motorised
housing had had an indicator that changed between "closed" and "open". I
presume the valve is rotated by the motor in one direction only and can go
from "open" at 0 degrees and 180 degrees, and "closed" at 90 and 270
degrees.

they aren't as simple as closed & open. they don't swing anywhere near 180 degrees.


(*) I noticed that the electricity consumption (which I read every few days
while we are getting used to the vagaries of our new house) was excessive..
I'd thought it was due to the CH motor running all day long (apart from
overnight),

40w is about £40 a year if on 24/7 or about £10 per bill