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[ElectroBOOM] Valve motors inefficient design or fail-safe construction?

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golden_labels:
In his most recent ElectroBOOM video, Mehdi makes a comment on a “inefficient” valve design:

Usually he cares about providing true and valuable information, but I have a feeling this time something is wrong. Instead of a motor constantly pressing against a spring-loaded mechanism, he proposes a controlled motor that opens the valve, stops, closes the valve, stops. While that would indeed would waste less power(1), isn’t the mechanism designed intentionally like that to be fail-safe and close the valve if power fails?

(1) Let’s now ignore whether the waste is important or not. I know we’re talking about fractions of a watt in a hunreds watts to kilowatt range heating system.

nctnico:
A simpler fail safe system is to use a valve that shuts down when the water temperature gets too high. In my (zoned) floor heating system I have a valve that stops the motor when it is opened of closed and another (passive) valve that shuts down the water flow in case the water gets too hot.

More generally speaking: chances are high that in case of a power failure, the water stops circulating anyway.

HuronKing:
Electroboom giving bad advice? Say it ain't so.  ::)

 :P

tom66:
Complaining about 9W of power dissipated in the motor for a heating system that's probably supplying 2-3kW per room - and only supplying that when the zone itself is on - seems like Medhi cannot see the forest for the trees.

elekorsi:
What on earth is that?

He should blur that out on the video, as this is some seriously disturbing content

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