I've got a couple of these, controlling a upstairs and downstairs zones:
http://www.screwfix.com/p/siemens-czv222-2-port-zone-valve/77334
I'm using them manually at the moment, as I've not wired in the thermostat/timer just yet. I'm just about to. I notice that when they're closed, the radiators in the zone that's supposed to be off slowly get hot. There's obviously some flow still getting through.
Is that to be expected? Should they not be a reasonably tight seal? When they're actually powered, would they seal any tighter? They seemed to just close via a spring, so I didn't think they'd use the motor to close when powered.
Maybe I should have just shelled out for some Honeywell ones :-/
http://www.screwfix.com/p/honeywell-v4043h-2-port-motorised-valve/31480
http://www.screwfix.com/p/siemens-czv222-2-port-zone-valve/77334
I'm using them manually at the moment, as I've not wired in the thermostat/timer just yet. I'm just about to. I notice that when they're closed, the radiators in the zone that's supposed to be off slowly get hot. There's obviously some flow still getting through.
Is that to be expected? Should they not be a reasonably tight seal? When they're actually powered, would they seal any tighter? They seemed to just close via a spring, so I didn't think they'd use the motor to close when powered.
Maybe I should have just shelled out for some Honeywell ones :-/
http://www.screwfix.com/p/honeywell-v4043h-2-port-motorised-valve/31480