On 2 Oct, 01:06, fred wrote:
In article , John
writes



"fred" wrote in ...
In article , John
writes

Remember that the radiator will be at pressure so you cant prevent it from
****ing out some water by just closing the valves and the air vent.

I did wonder about that but they suggest you release pressure on any
trapped air by opening the bleed vent first and then closing it before
opening the drain screw over a drip tray and fitting a hose

Possible faff, but they are dinky.

A large radiator will need to squirt out quite a bit before its pressure is
released.

How so? Water is incompressible and so cannot retain any pressure.
Pressure can only be retained by any unbled air in the radiator which
can be released via the bleed valve with perhaps a trickle of water.

This is the case when both ends of the rad are turned off as described
in the instructions. Any pressure stored in the system (via the
expansion vessel could then be released by opening the rad valve to link
the system back to the rad.
--
fred
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There is usually a small amount of air/gas in raditors. You can't
bleed it all out.