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Author Topic: UFH actuators to control water storage system?  (Read 3428 times)
Pilgrim
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« Reply #15 on: July 28, 2017, 06:57:46 AM »

Probably worth pointing out that motorised valves intended for heating systems are not designed to be used as flow control on open systems i.e. they should not be used as a tap (shut-off valve). They are designed for closed-loop systems where there is a balanced static pressure on both sides.
To put another way, they are likely to 'let-by' if you try to hold back a head of water to open drain.

I would have thought good insulation around the tank will keep it below 20 especially if the water is being used. We don't worry about mains filled tanks getting too hot do we? And the incoming water fill temp is probably similar over summer.
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Antman
Thanks Antman. So the drain would probably be okay for draining a static tank, but not controlling the mains input?
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Pilgrim
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« Reply #16 on: July 28, 2017, 07:16:12 AM »

Something like this? http://www.solenoid-valve.world/by-industry/water-industry/nylon-water-solenoid-valve
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Antman
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« Reply #17 on: July 28, 2017, 08:41:03 AM »

Thanks Antman. So the drain would probably be okay for draining a static tank, but not controlling the mains input?
Hi Pilgrim
No because the valve still has a differential static pressure owing to the 'head' on the tank one side and atmospheric pressure on the outlet.
Antman
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Pilgrim
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« Reply #18 on: July 28, 2017, 08:58:55 AM »

Thanks Antman. So the drain would probably be okay for draining a static tank, but not controlling the mains input?
Hi Pilgrim
No because the valve still has a differential static pressure owing to the 'head' on the tank one side and atmospheric pressure on the outlet.
Antman


Thanks! So solenoids for both then?
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