The function of the turbocharger bypass valve is to protect the turbine from excessive 

turbine pressure. The functions of the bypass valve are described as follows:

1. To understand the use of bypass valve, first of all, the working principle of the steam 

turbine. A turbocharger consists of two parts, one exhaust turbine and the other 

compression turbine. The exhaust turbine is connected to the exhaust manifold, and 

when the engine reaches a certain speed, the exhaust gas has enough energy to drive 

the exhaust turbine to spin. After the exhaust gas starts to spin, the compressor turbine 

will also spin, so that the compressor turbine can compress the air and blow into the 

air red, thus increasing the power of the engine. If the engine speed is too high, the 

pressure on the exhaust turbine will increase, and if there is no device, the turbine will 

explode. Therefore, the device of bypass valve appeared.

2. When the exhaust turbine pressure is too high, the bypass valve will be opened, so 

that the exhaust gas from the engine will be directly discharged without passing

through the exhaust turbine, thus avoiding the phenomenon of excessive turbine 

pressure. General turbocharged engines are equipped with mechanical bypass valves, 

some high-end turbocharged engines are equipped with electronic bypass valves. 

Electronic bypass valve control more accurate, faster response. The bypass valve prevents 

the turbine pressure from being too high and also prevents the turbine from turning too 

fast. If the turbine speed is too high, it can also damage the turbine.