EGR Valve: Description and Operation

EGR Valve:

PURPOSE
The Exhaust Gas Recirculation (EGR) Valve controls the quantity of exhaust gas to be diverted to the intake manifold.

OPERATION
When vacuum is applied to the EGR diaphragm, in response to the opening of the throttle valve, the EGR valve controls the amount of exhaust gas to be diverted to the intake manifold through vertical movement of a taper valve connected to the diaphragm.