1：What is it?
A thermostat is a valve that controls the flow path of the coolant. It is an automatic regulating device that typically contains a temperature-sensitive component. By controlling the opening and closing of the valve, it regulates the flow direction of the liquid.
2：Function
The thermostat automatically adjusts the amount of water entering the radiator based on the temperature of the cooling water. It changes the range of water circulation to regulate the cooling capacity of the cooling system, ensuring that the engine operates within the appropriate temperature range.
3：Working principle
The most commonly used thermostat is the wax-type thermostat. When the cooling temperature is below the specified value, the refined wax inside the temperature-sensitive component is in solid form. Under the action of the spring, the thermostat valve closes the passage between the engine and the radiator, causing the coolant to return to the engine through the water pump for internal circulation. When the coolant temperature reaches the specified value, the wax begins to melt, gradually turning into a liquid. As the volume increases, it compresses the rubber hose, causing it to contract. While the rubber hose contracts, it exerts an upward thrust on the push rod, which, in turn, applies a downward counterthrust on the valve, opening it. At this point, the coolant flows through the radiator and the thermostat valve, and then returns to the engine through the water pump for overall circulation.
