From the Building Detail screen click the Valve tab for the valve you wish to delete (Valve (control valve), Drain Valve, or ITV).
In this example, we will be removing a control valve, and would have clicked on the Valve tab
Locate the valve you'd like to delete, and click Edit
Click Delete Control Valve
>>> A pop up box will appear asking you to confirm your request to delete
Click OK in the pop-up box
>>> You will be redirected back to the Building Detail screen
>>> Repeat this process outlined above until you have deleted all desired valves