The function of the liquid surface covering ball of the water tank is mainly to keep the water level inside the water tank stable and prevent the fluctuation of the water level from being too large and affecting the normal use of the water tank. When the water level in the tank drops, the liquid level covering ball will automatically sink so that the water level in the tank remains the same. At the same time, the liquid surface covering ball can also reduce the precipitation of scale and impurities in the water tank, and keep the inside of the water tank clean. In addition, the design of the liquid covering ball also helps to reduce the oxygen content inside the tank, preventing corrosion and oxidation inside the tank.
The material of the liquid surface covering ball is generally made of corrosion-resistant, high-temperature-resistant, and wear-resistant materials, such as stainless steel, engineering plastics, etc. Its structure is generally composed of a sphere, a buoyancy device and a connecting rod, and the buoyancy device is the core part of the liquid surface covering ball, which can automatically adjust the buoyancy according to the change of the water level inside the water tank, so that the liquid surface covering ball is always maintained in a certain position. 
There are many benefits to using a liquid level covering ball in a tank. First of all, it can ensure the stability of the water level inside the water tank and avoid affecting the normal operation of the equipment due to excessive fluctuations in the water level. Secondly, it prevents the precipitation of limescale and impurities, reducing the cleaning and maintenance workload inside the tank. Finally, it can reduce corrosion and oxidation inside the tank, prolonging the life of the tank. 
Therefore, the use of liquid level cover balls in water tanks is a very practical technology that is widely used in various industrial and civil fields.