Types of EGR Valve:
Although there are several styles of EGR valve — earlier systems use a vacuum-operated valve, while newer vehicles are electronically controlled — the most types may be broadly summarized as:
Diesel high-pressure EGR valves:
Divert the high-flow, high-soot exhaust gas before it enters the diesel particulate filter – the soot can combine with the oil vapor to make sludge. The gas is then passed back to the manifold either via a pipe or internal drillings within the plate. A secondary valve is additionally wont to help create a vacuum within the manifold as this is often not naturally present on diesel engines.
Diesel Low-pressure EGR valves:
Divert the exhaust gas after it’s older the diesel particulate filter — this gas includes a lower flow but is nearly completely clean of soot. The gas is then passed back to the manifold via a pipe.
Gasoline EGR valves:
Divert the exhaust gases, very similar to the high-pressure diesel equivalent. The vacuum created by cylinder depression draws the exhaust gases in, and also the flow is regulated by the opening and shutting of the EGR valve itself.
Vacuum operated EGR valves:
Use a vacuum solenoid to vary the vacuum to the diaphragm and, in turn, open and shut the EGR. Some valves also include a feedback sensor to tell the ECU of the valve’s position.
Digital EGR valves:
Feature a solenoid or stepper motor and, in most cases, a feedback sensor. These valves receive a pulse width modulated signal from the ECU, to manage exhaust gas flow. Read and learn about car Technical FAQ and get in-depth details of the car features.
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