What is the cap of a car expansion kettle
The cap of the car expansion water tank (also known as the pressure water tank cap) is a key component of the cooling system. Its main function is to regulate the system pressure and separate the gas to ensure that the engine/motor operates at an appropriate temperature.
Function and Role
Youdaoplaceholder0 Regulate system pressure : When the pressure of the cooling system exceeds the set value (usually 0.12MPa), the valve automatically opens to release steam, preventing pipeline damage due to excessive pressure. After the pressure returns to normal, the valve closes to maintain the stability of the system.
Youdaoplaceholder0 Separate gas : During the circulation of coolant, gas is produced. The kettle cap separates the gas to prevent "gas blockage" and ensure the heat dissipation efficiency.
Youdaoplaceholder0 upper/lower limit : The lid of the water bottle is usually marked with a coolant capacity scale to check if the liquid level is normal.
Signs of failure
If the cap of the expansion kettle is damaged or the pressure relief is abnormal, it may lead to coolant leakage, engine overheating or a decrease in cooling efficiency, and timely maintenance is required.
The cap of the car expansion kettle is a key component of the cooling system. Its main functions include regulating pressure, separating gas and protecting the stable operation of the system.
Regulate the system pressure
The inside of the expansion kettle cover is equipped with a pressure relief valve. When the temperature of the coolant rises and the system pressure exceeds the set value, the valve automatically opens to release the excess gas or liquid, preventing the cooling pipeline from bursting due to excessive pressure.
Separating gases enhances efficiency
During the circulation of coolant, gases (such as water vapor) will be produced. If they directly enter the pipeline, it will cause air blockage and poor heat dissipation. The expansion kettle cover keeps the pipeline unobstructed by discharging gas, ensuring the cooling efficiency.
Protect system security
When the temperature of the coolant drops, the check valve on the lid of the kettle can automatically connect the internal and external pressure to prevent the coolant from backflowing or leaking, maintaining the pressure balance of the system.
Precautions
Do not directly open the lid of the kettle when the temperature is : the high-temperature coolant inside may spray out, causing burns or overheating of the engine.
Youdaoplaceholder0 Check the liquid level and sealing performance : Regularly observe whether the liquid level of the expansion kettle is within the upper and lower limit marking lines to ensure good sealing.
A damaged cap of the car expansion kettle can cause a backflow phenomenon (i.e., coolant spurts out or overflows from the radiator or the expansion kettle opening) . This is because the cap cannot release pressure normally, resulting in an imbalance in the cooling system pressure and forcing the coolant to overflow at high temperatures.
Youdaoplaceholder0 Causes and symptoms of backflow
The expansion kettle cap is a pressure-regulating component of the cooling system. Once it is damaged, the excess pressure cannot be released through the steam valve, causing the coolant to spray out from the expansion kettle opening or the radiator cap at high engine temperatures. The main symptoms include:
Youdaoplaceholder0 coolant spray or overflow : When the cap seal fails, coolant is directly sprayed out from the expansion kettle or radiator cap.
Youdaoplaceholder0 engine overheating : The coolant flow decreases, the pressure drops, and the heat cannot be dissipated, causing the water temperature to rise or even "boil over".
Youdaoplaceholder0 Abnormal reduction of coolant : Backflow of water causes rapid loss of coolant, and the liquid level is below the minimum mark.
Youdaoplaceholder0 Consequences and handling suggestions
Backflow of water may cause serious malfunctions such as engine cylinder pulling and pipe burst. Immediate:
Youdaoplaceholder0 Replace the cover : Select a standard new cover for the pressure relief valve that matches the model.
Youdaoplaceholder0 Check the cooling system : ensure the coolant level is between the marks, and rule out leaks or damaged cylinder gaskets.
Youdaoplaceholder0 Avoid poor-quality coolant : Use regular products to prevent system blockage.
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