What device is installed on an inlet/outlet pipe to automatically control flow into a tank?

The altitude valve is specifically designed to control the water flow into a tank based on its water level. This device helps maintain the desired water level by automatically adjusting the flow as needed. Essentially, when the water level in the tank reaches a pre-determined altitude, the valve closes or opens to either stop or allow the incoming flow of water. This ensures that the tank is neither overfilled nor depleted of water, which is crucial for maintaining system efficiency and preventing overflow or dry running conditions.

In the context of water treatment systems, altitude valves play a significant role in automating flow regulation and minimizing the need for manual intervention, thus enhancing operational efficiency.

The other options do not perform the same function as the altitude valve. An air vent primarily serves to allow air to escape and prevent vacuum conditions within a tank. An electrode is typically used for measuring water quality parameters, such as pH or conductivity, but does not control flow. An ultrasonic sensor is used for level measurement by emitting sound waves, but it also does not regulate flow directly.