What is the pipe on the valve cover of Wuling Hong Guang S 18?

It is used in oil-water separator. One-way valve, called PCV valve, is used for forced ventilation of crankcase.

The gas extracted from the crankcase is introduced into the intake pipe of the engine and sucked into the cylinder for re-combustion. This ventilation mode is called forced ventilation, and gasoline engines generally adopt this crankcase forced ventilation mode. In this way, the mixture escaping into the crankcase can be recycled, which is beneficial to improve the economy of the engine.

The first one is connected with the subsequent air branch pipe, and this end has a PVC valve (also called crankcase forced ventilation valve), which is a one-way valve. The exhaust gas generated by the crankcase is pumped into the intake branch pipe and burned by the vacuum negative pressure generated after the other end is connected with the intake branch pipe.

The second one is for air intake, and the other end is connected to the bellows connected to the throttle valve of the air grille, which is directly connected to the atmosphere.