Purpose: The page for controlling water towers or reservoirs is suitable for automatic water supply systems in various water tanks (boxes) and water towers in industrial and mining enterprises, as well as civil buildings. Features: The valve body features a full-flow streamlined design, offering high flow capacity, excellent sealing performance, simple maintenance, flexibility, durability, precise liquid level control, resistance to water pressure interference, and a tight shut-off with no leakage. Principle: The upper chamber of the main valve is connected to a control float valve, which is fixed at the water tank's liquid level. When the liquid level in the tank drops, the float valve opens, allowing the main valve to open and supply water to the tank. When the liquid level rises to the position of the float valve, the float valve closes, causing the main valve to close as well, stopping the water supply to the tank.