EGR Valve: Description and Operation

EGR Valve:

PURPOSE
The EGR valve controls the amount of exhaust gas that will be allowed back into the combustion chamber.

OPERATION
The EGR valve contains a spring loaded diaphragm that will move upward when vacuum is applied. The upward movement will lift a tapered valve off it's seat and allow some exhaust gas to pass through into the Intake Manifold.