What is the name of the valve used to regulate water in an elevated storage tank?

The altitude valve is specifically designed for regulating the water level in elevated storage tanks. Its primary function is to maintain a predetermined water level by opening to allow water to flow into the tank when the level drops below a set point and closing when the water reaches the desired altitude. This automatic regulation is essential for preventing overflows and ensuring that the water supply remains stable and consistent for distribution.

The other options serve different purposes; for instance, a pressure valve is meant to regulate the pressure within a system, while a flow control valve manages the flow rate of water rather than the level in a storage tank. A gravity valve typically relies on the natural force of gravity to control water flow, which is not the intended application in elevated storage tanks where altitude control is necessary.