Electronic Sonic EGR Valve
This valve operates like a ported valve, except a tapered pintle is used for more exact flow control. A sensor mounted on top of this valve sends out electrical signals that tells the electronic control assembly (ECA) how far the EGR valve is open. The ECA then signals the EGR control solenoids to maintain or alter EGR flow as required. Source vacuum is from manifold, and is bled off or applied to the diaphragm by the ECA. A cooler is sometimes used to reduce gas temperature, reduce detonation and allow better gas flow. This valve operates only a part throttle mode. It is closed in all other modes.