2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:42
Oddly enough, on the Internet you can find thousands of articles about thermostats and radiators, but few people remember such an important detail in the cooling system as a membrane expansion tank. It has a visually simple design and primitive functions, but its presence is very significant for every car. Often, motorists have come across cases when the internal combustion engine temperature sensor gives exorbitant values. But few people thought about the reasons. Therefore, today we will talk about what membrane expansion tanks are and how they work.
Design Features
This part is a kind of plastic container, equipped with special rubber hoses through which liquid is delivered, and sensors to determine its level in the tank. In addition, each membrane tank is equipped withpressure relief valve. As a rule, it can be seen in the top cover of the container. Why is it needed? Its presence is very significant for each expansion tank. It is the bypass valve that regulates the pressure in the tank at different temperatures. Coolant, like water, tends to expand at high temperatures. So, if the motor heats up to 110 or more degrees Celsius, the antifreeze pressure increases significantly. And in order to prevent an explosion of the container, there is a special valve that regulates these values. That is why, when the engine overheats, you do not need to immediately open this part - not only will it jump out under the influence of pressure in an unknown direction, splashing boiling antifreeze on the driver, but also the engine will not stop cooling.
How does a car's diaphragm expansion tank work?
When the engine is running, all its components heat up. Accordingly, the temperature of the coolant also increases. And since this system is completely sealed, a critical pressure is created inside it. The engine cooling device begins to gradually expand, and excess air accumulates in the membrane tank, which was formed during the temperature jump. After a critical pressure is formed in the container (but not such that the container is about to explode), the valve begins to open and release the accumulated air. Gradually, the degree of compression of the liquid decreases. The walls of the container, in turn, do not allow the liquid to spread or evaporate.
In winter, the membrane tank also plays a big role. At low temperatures, the engine cools down immediately. At the same time, the pressure in the engine cooling system decreases. To prevent this mark from being too low (less than atmospheric), the inlet valve in the tank opens and draws air into the system. This prevents the plastic container from shrinking into a tubular shape and keeps the coolant level correct.
Conclusion
As you can see, the membrane tank, despite its primitive design, performs very important functions and plays an important role in the life of the car.
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