What is expansion tank cap?- Taizhou Kelong Plastic Mould Co., Ltd.

The expansion tank cap is an important part of the HVAC system. It accommodates the expansion of the system water in the heating system, and also plays the role of constant pressure and water supply for the system. Generally made of steel plate, usually round or rectangular. Due to the thermal expansion and contraction of the water in the heating system, when the hot water heats up, the water volume in the system increases. When there is nowhere to accommodate this part of the expansion of the water, the water pressure in the heating system increases, which will affect the normal operation. . The water expansion volume of the system is accommodated by the expansion tank, which can reduce the water pressure fluctuation caused by the expansion of the system, and improve the safety and reliability of the system operation. When the system leaks or cools down for some reason, the water level of the expansion tank down to replenish water to the system. The expansion tank also stabilizes the pressure in the system and removes the air released by the water during the heating process.

Calculation of tank volume

V=αΔtVa

where V—the effective volume of the expansion tank (that is, the volume equivalent to the height between the inspection pipe and the overflow pipe), L;

α—the unit volume expansion coefficient of water, α=0.0006;

Δt—Considering that sufficient water capacity should always be stored in the expansion tank to compensate for the volume shrinkage when the water in the system is cooled, the maximum fluctuation value of the water temperature in the system is generally calculated from the water temperature of 20°C;

Va—water volume in the system, L.

The expansion tank is used in the closed water circulation system, which plays the role of balancing the water volume and pressure, avoiding the frequent opening of the safety valve and the frequent replenishment of the automatic water replenishment valve. The expansion tank not only plays the role of accommodating the expansion water, but also acts as a water replenishment tank. The expansion tank is filled with nitrogen, which can obtain a larger volume to accommodate the expansion water volume. Hydrate. The control of each point of the device is interlocking reaction, automatic operation, small pressure fluctuation range, safety and reliability, energy saving and good economic effect.
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