Car heater water valve switch

Heat air water valve 1. Cooling water circulation The cooling water circulation route: The thermostat can make the cooling water have three circulation routes: small circulation, large circulation and mixed circulation. 1． Small cycle: When the engine water temperature is lower than 76°C, the main thermostat valve is closed, the bypass valve is opened, and the cooling water channel from the cylinder head to the radiator is cut off. The cooling water flows out from the cylinder head water jacket, enters the water pump through the thermostat bypass valve and bypass pipe, and is sent to the cylinder block water jacket through the water pump. Since the cooling water does not dissipate heat through the radiator, the engine temperature can increase rapidly. This type of cycle is called a small cycle. 2. Large cycle: When the engine water temperature is higher than 86°C, the main thermostat valve opens and the bypass valve closes. All the cooling water enters the radiator through the main valve for heat dissipation, and the water temperature drops rapidly, and then is sent to the cylinder block water jacket by the water pump. This type of cycle is called a macrocycle. 3. Mixed cycle: When the water temperature is between 76 and 86°C, the main valve and the bypass valve of the thermostat are partially open. At this time, both large and small cycles exist, and only part of the cooling water is dissipated through the radiator. 2. Working principle of wax thermostat Paraffin is solid at normal temperature. When the water temperature is lower than 349K (76℃), the main valve is completely closed and the bypass valve is fully opened. The water from the cylinder head directly enters the water pump through the bypass pipe. Therefore it is called a small cycle. Since the water only flows between the water pump and the water jacket without passing through the radiator, and the flow rate is small, the cooling intensity is weak. When the engine water temperature reaches above 349K (76°C), the paraffin gradually turns into a liquid state, and the volume increases accordingly, forcing the rubber tube to shrink, thereby pushing upward on the lower cone surface of the center rod. Since the upper end of the rod is fixed, the center rod produces a downward reverse thrust on the rubber tube and the induction body, overcoming the spring tension to gradually open the main valve and gradually reduce the opening of the bypass valve. When the engine water temperature rises to 359K (86°C), the main valve is fully opened, the bypass valve is fully closed, and all cooling water flows through the radiator, which is called a large cycle. Because the cooling water flow line is long at this time, the flow rate is large, and the cooling intensity is strong. 3. Discussion on the Installation of the Heating Air Water Valve The purpose of the repost is to explain one point: the "heating cycle" of the car air conditioner is a completely different cycle from the "small cycle" mentioned in the repost! Because, if the "heating cycle" is a "small cycle", then after the refrigerant temperature reaches 86 degrees Celsius, the bypass valve will close the "small cycle", which means closing the "heating cycle" - this is impossible ! So when you install a heating water valve, you only need to use a two-way valve to turn off the water inlet pipe of the "heating cycle" like Geely King Kong does. You don't have to worry about "breaking the water pump"! The "Santana 3000 H-type four-way heating air and water valve" installed to prevent "blocking the water pump" is completely unnecessary.