What is a PCV valve?

[McJoel]

PCV valve is a valve in the crankcase ventilation system. The following is an introduction to the PCV valve in automobiles: Composition: The PCV valve consists of a valve body, valve, valve cover, and spring, and cannot be disassembled. Function: Its main function is to direct the gases from the crankcase into the intake manifold through the PCV valve, with a small amount of air entering the intake manifold directly from the air filter via the PCV valve. This prevents phenomena such as icing at the throttle, incomplete combustion, and worsening emissions, avoiding blow-by gases from entering the atmosphere and preventing engine oil from deteriorating. Basic introduction: These blow-by gases would otherwise escape from the crankcase into the atmosphere, causing pollution. If not removed, these blow-by gases can also dilute the engine oil in the crankcase, leading to oil deterioration and premature wear of engine components.