Working principle of hot water expansion tanks

Definition of a hot water expansion tank: A hot water expansion tank consists of four components: a tank body, an air bladder, a water inlet, and an exhaust port. It is mainly used in water systems to balance pressure fluctuations and supply water in some areas. Working principle of the hot water expansion tank: When water under external pressure enters the bladder of the expansion tank, the nitrogen gas sealed inside the tank is compressed. According to Boyle’s law, when a gas is compressed, its volume decreases and its pressure increases, until the pressure of the gas inside the expansion tank equals the pressure of the water, at which point the inflow of water stops. When the pressure due to water loss decreases, the gas pressure inside the expansion tank becomes greater than the pressure of the water; at this point, the gas expands and the water is expelled. Drainage stops once the gas pressure and the water pressure are equal again. The above content is from Baidu Baike

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Reply to 1# xxz343: Where are thermal expansion tanks used? Is it similar to the function of a sump? Is it at the highest point of the system?