What is a PCV Valve?
1 Answers
The following is a related introduction to the PCV valve: 1. The PCV valve consists of a plunger-type valve and a spring, located on one side of the intake manifold. The vacuum level of the intake manifold determines the opening and closing of the PCV valve and the degree of its opening, which in turn determines the amount of blow-by gas mixture that is re-inhaled into the intake manifold for combustion. When the engine is running at a constant speed or relatively low RPM, the airflow is small, and the blow-by gas is also minimal. The PCV valve opens slightly or even closes, resulting in a small amount or no forced inhalation of blow-by gas for combustion. 2. When the engine accelerates or runs at higher RPM, the airflow increases, and the blow-by gas also increases. The PCV valve opens wider, leading to a greater amount of forced inhalation of blow-by gas for combustion. 3. The PCV valve is a metering control valve composed of a valve body, valve, valve cover, and spring. It is non-disassemblable and is installed between the engine crankcase ventilation system and the intake system. 4. The PCV valve is controlled by vacuum, regulating the flow of oil fumes generated by the crankcase ventilation system into the intake system. The flow rate is higher when the engine operates at high speeds compared to low speeds. Additionally, the PCV valve should cut off ventilation when engine backfire occurs.
