wrote in message
...
I'm after a float valve of some sort which will not get damaged if
it
is completely submerged. I want to have a tank which is mostly
filled
from local sources of water but, if the local sources dry up, then
the
float valve will maintain a foot or so of water in the bottom of the
tank from the mains. (I guess there will have to be strict
non-return
precautions to conform to water byelaws too)

So, I need a float valve that won't mind being underwater, I suspect
that the 'standard' sort of cold water tank valve with a big
spherical
float won't survive being under water.

Would a Torbeck valve be OK, or do they include the flushing
mechanism
which I don't need?

--
Chris Green


You could used the low pressure diaphragm switches (*) used to set the
levels in washing machines, and have them controlling solenoid
valves - again from washing machines - so not only is the switch not
submerged, but the two sources of water can be totally isolated.

AWEM

(*)They use a column of air trapped in a tube, as the level rises so
does the pressure in the tube and the switch triggers - usually have
two independant set points that are tweakable with a little screw