EGR Valve W/Integral Backpressure Sensor

Calibration is accomplished by use of different diaphragm spring loads and flow control orifices. This integral type unit combines EGR valve and backpressure sensor functions into one component. Restrictor plate is required with some engines.

Exhaust gas exerts backpressure inside exhaust manifold whenever engine is running. This pressure is conducted through hollow pintle stem into EGR diaphragm control chamber. If this pressure is great enough to overcome spring tension against diaphragm, diaphragm is moved against bleed valve and exhaust gas flow begins.