Is the Exhaust Valve the Same as the EGR Valve?
1 Answers
The exhaust valve is not the same as the EGR valve. The differences between the two are as follows: Different Functions: The EGR valve is an electromechanical product installed on diesel engines to control the amount of exhaust gas recirculated back into the intake system. Its purpose is to regulate the volume of exhaust gas entering the intake manifold for recirculation. The exhaust valve, also known as an oil separator or pressure control valve, is installed between the compressor outlet and the condenser inlet. Through separation, it improves heat transfer efficiency in the condenser and evaporator. Different Working Principles: The EGR valve reduces combustion chamber temperature by directing exhaust gas from engine combustion back into the intake manifold for re-burning. This enhances engine efficiency, improves combustion conditions, reduces engine load, effectively decreases NOx emissions, minimizes knocking, and extends the lifespan of components. The working principle of the exhaust valve: High-pressure gas (gaseous working fluid and lubricating oil) from the compressor enters the exhaust valve and passes through guide vanes, forming a spiral flow. Centrifugal force and gravity separate the lubricating oil from the working fluid, which then flows down along the inner wall of the cylinder. The working fluid gas is discharged through a central pipe with multiple baffles. The separated lubricating oil collects at the bottom of the oil separator and can be periodically drained or automatically returned to the compressor's crankcase via a float valve.
