КРЫШКА РАСШИРИТЕЛЬНОГО БОЧКА. ПРИЗНАКИ НЕ ИСПРАВНОЙ КРЫШКИ. Принцип работы.

Expansion tank cap. Operating principle. Signs of a faulty CAP I didn't mention that a faulty valve that relieves excess pressure can cause the expansion tank to bulge and blow off the hoses. The expansion tank cap and how it works It's absolutely clear that the hotter the engine, the hotter the coolant. Considering that the entire cooling system is sealed, this creates very high pressure, resulting in a general expansion of the entire system, but within a certain permissible limit. Because all the air is forced upward into the expansion tank under high pressure, the high pressure of the compressed air at a certain point opens the bleed valve in the expansion tank, and the air leaves the system. Now, when the system and coolant cool, the same process occurs, only with air intake in the opposite direction. A sudden drop in pressure can cause decompensation. To prevent the pressure in the expansion tank from falling below standard atmospheric pressure, the inlet valve in the expansion tank automatically opens, allowing air to enter to equalize the pressure. Sometimes, uninformed drivers ignore this cap; it sits untouched, boils, becomes coated with salts, and corrodes, causing both the valve and the system to stop working properly. Problems caused by a malfunctioning expansion tank valve Due to the above-described carelessness, the valve becomes corroded and simply disintegrates, leaving the cooling system unsealed. Air freely circulates through the system as the coolant heats up and cools, naturally creating air pockets. Any air pocket, even a minor one, contributes to engine overheating, and the system also becomes completely unsealed. In addition, small components of the heating and cooling system can fail, resulting in a non-functioning heater in the middle of winter. Even if the expansion valve isn't broken, but is clogged, the same problem occurs. Pressure builds up with nowhere to escape, eventually finding a way out through a broken component, and the heating system becomes depressurized again. Sometimes, high pressure can rupture hoses, spilling coolant and causing the engine to simply boil. Alternatively, the radiator can leak, which is less of a problem than a boiling engine. Regardless, such overheating can cause thermostats and water pumps to fail, hoses to lose their flexibility and strength due to extreme temperatures, and other components need to be replaced.