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Showing results for tags 'zone valve'.
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I have a pathological hatred of typical 2-port valves. They all seem to be based on the same ancient, crappy, design of a synchronous AC motor that gets hot when driven to stall, via a micro-switch hacked-in current limiting resistor (that also gets hot) dissipating something in the order of 6 Watts. Getting on a bit in years, I've lost count of the number of actuator heads I've had to replace and the price of them was beginning to feel more like a tax on owning a heating system. The final straw came on a frosty X-mas morning when the heating didn't come on because... That was a couple of years ago and because SFix & TSn were closed for the festivities, I enlisted a Raspberry Pi, stepper motor and 3D printer to be hero just for one day. This episode gave me a taste for getting back control of my heating system and I have not looked back since. These days I use a bunch of drayton 2-port valve bodies (£3 Ebay) with a micro metal gearbox motors (<£5) driven by Pololu H-bridge constant current drivers (£5) mounted on some scrap metal: My question is... do people around here just put up with the typical Honeywell/Drayton valves circa £60 or do they go for something more exotic (that I've yet to find) or are they rolling their own like me?
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All, My parents had a nest system installed a few weeks ago and there is something odd going on with the 2 port valves. There are separate valves for HW, downstairs rads and upstairs rads. The thing I find odd is that even when there is no demand, there appears to be current going to the valves. Also, I have noticed that the levers sometimes feel completely floppy, as if they are not connected to anything. I took the cover off one of them and it stiffened up, put the cover back on and it went floppy. Any thoughts on what might be going on here? Many thanks
