What is an automobile pcv valve?

PCV valve, that is, the forced ventilation control system of crankcase ventilation, is a metering control valve installed between the engine crankcase ventilation system and the air intake system. 1, Introduction: PCV valve is composed of valve body, valve, bonnet and spring, which are inseparable. Its main function is to guide the gas in the crankcase into the intake manifold through the PCV valve, and a small amount of air directly enters the intake manifold from the air cleaner through the PCV valve, so as to avoid the phenomena of freezing, insufficient combustion and emission deterioration at the throttle, prevent blowby from entering the atmosphere and prevent engine oil from deteriorating. 2. Working principle: PCV valve is controlled by vacuum degree, which regulates the flow of lampblack generated by crankcase ventilation system into air intake system. When the engine is running at high speed, the flow rate is higher than that at low speed. At the same time, when the engine backfires, the PCV valve should be able to cut off the ventilation and prevent the crankcase from exploding.