EGR VALVE DEVICE

摘要

An EGR valve device (1) includes a valve housing (2) of which inside exhaust gas passes through, a poppet valve (3) as a valve body accommodated in the valve housing (2), and a hydraulic servo actuator (4) for driving the poppet valve (3) to be opened and closed. The hydraulic servo actuator (4) is provided by a three-port ( Fig. 2 ) or four-port servo valve.