Hmm, mine shows up as a leak sensor. Issue is the device has multiple capabilities and the devices page does not have a way to select which one to show.
I think that is being worked on right now with the current beta app and platform: [iOS Mobile App Beta 2.1.1] What’s new in build 390 "Dashboard like devices" I think will allow you to customize the tiles.
Otherwise for now you would have to make a dashboard so you can set the tile as a valve.
Or you could also create a Virtual water valve (or switch) and then sync that with the real device with a rule or the Mirror app. Using the virtual devices has a better chance of working because there will only be one capability.