A device that automatically shuts off flow in an elevated storage tank at a preset water level is known as?

An altitude valve is designed specifically to control the water level in elevated storage tanks. When the water reaches a predetermined level, the altitude valve automatically shuts off the flow, preventing overflow and potential damage. This mechanism is essential for maintaining a stable water supply and avoiding the issues that can arise from overfilling, such as spillage or flooding.

This type of valve operates based on the level of water in the tank rather than pressure or other factors, distinguishing it from other valve types. For example, while a float valve operates similarly by using a float mechanism to open or close the flow, it is typically found in applications where direct control based on water level is needed, such as in smaller tanks or cisterns rather than large elevated storage tanks.

Pressure relief valves are primarily used to release excess pressure within a system to prevent damage, and isolation valves are used to shut off the flow for maintenance or repair. Neither of these valve types handles water level management in storage tanks as effectively as the altitude valve does.