EGR Valve: Description and Operation

The electronic EGR valve, is required in EEC systems where EGR flow is controlled according to computer demands by means of an EGR valve position (EVP) sensor attached to the valve. The valve is operated by a vacuum signal from the dual EGR solenoid valves or the electronic vacuum regulator which actuates the valve diaphragm. As vacuum overcomes the spring load, the diaphragm is actuated which lifts the pintle off its seat allowing exhaust gas to recirculate. The amount of flow is proportional to pintle position. The EVP sensor mounted on the valve sends an electrical signal of its position to the electronic control assembly.