H142XThe hydraulic water level control valve is a kind of hydraulic control valve which can automatically control the liquid level of water tank and water tower. When the water level drops more than the preset value, the float valve opens, the pressure of the upper chamber of the piston decreases, and the pressure difference between the upper and lower pistons forms. Under the action of this pressure difference, the valve disc opens for water supply operation; when the water level rises to the preset height, the ball valve is closed, and the pressure of the upper chamber of the piston increases continuously, which makes the valve disc close and stop water supply. In this way, the liquid level is automatically controlled at the set height to realize the function of automatic water supply. The product is suitable for automatic water supply system of various water tanks (pools) and water towers in industrial and mining enterprises and civil buildings. It can also be used as control valve of circulating water supply for atmospheric boiler. When the water level in the pool or tower drops and the ball valve is opened for drainage, there is pressure water in the inlet pipe to lift the piston in the valve and open the sealing surface. When the water level rises to the control valve, the ball valve is closed, and the piston moves downward to close the sealing surface, and the valve stops water supply.