The switched relays are designed for 230V. The floor valves are probably not, as they are controlled in the volt range. Therefore, this is probably not possible without detours.

The light bulb positions simply represent a consumer. So if you only want to control one on off, it works with this device without any problems. What is very practical about these devices is that you can make logic circuits with other components. I.e. you could mount this switch somewhere and simply buy a WLAN switch from the same manufacturer. Then you can say that when switch one is activated, element two should go on or off. This way you can install several switches that control a valve without having to wire them directly. Of course, it is a condition that the WLAN works.