What do you mean, "drives wrong"? Your video is doing just fine. If the valve is to be opened, it is actuated. If it is not operated, it is normally closed... But if it stays open all the time it looks like on the video...
For you the valve just doesn't close again. If you have inserted the gaskets correctly, it can only be the cap. Or something is really broken or bent, but you would have seen that for sure...
The cap must sit really tight on the plunger, because the spring pushes the cap back, and the cap takes the metal plunger back with it and closes the valve again. The cap must not be able to be pulled by the tappet even with slight force.
In the worst case you will have to buy a new drainage valve. Then it runs again. The control is completely OK so far...
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Pessimist: Ganz schön dunkel hier...
Optimist: Ich seh ein Licht am Ende des Tunnels...
Realist: Mist, da kommt ein Zug...
Zugführer: Was machen die 3 Deppen auf den Gleisen?
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