What role does the car check valve play?

The function of automobile one-way valve is mainly to control the exhaust gas involved in combustion, which is not only beneficial to environmental protection, but also ensures that the engine has enough power. Details are as follows: 1. Absorb exhaust gas: introduce the exhaust gas in the crankcase into the intake manifold to reduce the harmful gas discharged into the air by the engine. 2. Maintain normal pressure: keep the pressure in the crankcase below atmospheric pressure to reduce engine oil leakage. 3. Keep the crankcase ventilation oil fresh. One-way valve has a certain relationship with fuel saving. If the engine oil in the crankcase deteriorates, becomes dirty and blocks the check valve, the vacuum degree of the intake manifold will increase with the increase of the throttle opening, so the air velocity at the throat of the carburetor will increase, the oil output of the fuel injector will also increase, and the fuel consumption will also increase.