What is the function of an altitude valve?

An altitude valve plays a crucial role in maintaining the appropriate water level in tanks or reservoirs. It automatically controls the flow of water based on the water level within the tank. When the water level reaches a certain preset point, the altitude valve closes to prevent overflow. Conversely, when the water level drops below a specific level, the valve opens to allow water to flow in, thus keeping the tank refilled at a desired level. This automatic function is essential for efficient water management and helps prevent spills and wastage while ensuring a consistent supply of water.

The other choices do not accurately describe the primary function of an altitude valve. Regulating water temperature is not a function of any type of valve in this context, as temperature control is typically managed by different systems. Measuring water quality involves the use of sensors and monitoring equipment rather than a valve mechanism. Lastly, filtering contaminants is also not relevant to altitude valves, as that role falls to filtration systems designed for that specific purpose.