The main purpose of an EGR valve is reintroducing exhaust gas into the engine intake system. Such gas is mixed with fresh air before entering the cylinder for combustion. The specific benefits of an EGR valve include the following:

Reduce the emission of nitrogen oxides (NOx): A high-temperature and oxygen-rich environment is prone to producing nitrogen oxides. Introducing exhaust gas can lower combustion temperature and oxygen concentration, thereby reducing the amount of nitrogen oxides generated.

Improve fuel economy: Adequate exhaust gas recirculation can reduce air pumping loss, increase thermal efficiency of the engine, and save fuel to a certain extent.

Analysis of common failures of an EGR valve:

1. EGR valve jamming

Failure symptom: The EGR valve is unable to open/close normally, or it operates slowly.

Reason analysis: It may be due to deposition of carbon or impurities or wear or deformation of the valve stem.

Impact: It can lead to inaccurate amount of recirculated exhaust gas, which may result in unstable engine operation in idle status, vibration, weak acceleration, and excessive emissions.

2. EGR valve leakage

Failure symptom: When the valve is closed, there is still exhaust gas passing through it due to leakage.

Reason analysis: The valve is not sealed tightly, and the sealing gasket is aged or damaged.

Impact: It may result in too lean air mixture, abnormal engine operation, stalling and difficulty startup.

3. EGR valve circuit malfunction

Failure symptom: The EGR valve is unable to receive or execute control signals.

Reason analysis: It may be due to open circuit, short circuit, loose plug, sensor malfunction, or other factors.

Impact: The EGR system fails to work normally, which affects engine performance and emission.

Advantages of vika EGR valve:

Material: The clapboard, steel ball, and bearing pin of vika STO EGR valve are made of 304 stainless steel, which is highly resistant to corrosion and rust.

Process: The bearing pin of vika STO EGR vale features higher strength thanks to a press fitting assembly method and a welding process.

Aluminum parts: The aluminum parts of vika STO EGR valve are treated by means of hard anodizing, which leads to excellent corrosion and rust resistance and greater durability