Where is JAC He Yue b 15 waste gas valve?

Automobile waste gas valve can generally be seen on the engine valve cover or on the pipeline connected to the engine valve cover, and the pipeline is connected with the intake branch pipe of the engine. His exhaust gas is generated in the engine, passes through the position of the valve cover, passes through the exhaust valve pipeline, and then continues to be sucked into the intake branch pipe and enters the engine for combustion.