What does the PCV valve of China VI vehicles mean?

[VonSavannah]

PCV is the abbreviation of Positive-Crankcase-Ventilation in English, which means the active ventilation control system of the crankcase (or oil pan) in Chinese. It consists of a valve body, valve, valve cover, and spring, and cannot be disassembled. Here is some extended information: 1. Principle: The PCV valve is a metering control valve. It is installed between the engine crankcase ventilation system and the intake system. The PCV valve is controlled by vacuum to regulate the flow of oil fumes generated by the crankcase ventilation system into the intake system. The flow rate is higher when the engine is running at high speed than at low speed. At the same time, when the engine backfires, the PCV valve should cut off the ventilation to prevent crankcase explosion. 2. Function: The gas in the crankcase is introduced into the intake manifold through the PCV valve, and a small amount of air enters the intake manifold directly from the air filter through the PCV valve. This avoids phenomena such as icing at the throttle, incomplete combustion, and worsening emissions. It prevents the gas from entering the atmosphere and also prevents the engine oil from deteriorating.