| 摘要 |
An EGR valve device (1) having a valve housing (2) through the inside of which exhaust gas passes, a poppet valve (3) as a valve body received in the valve housing (2), and a hydraulic servo drive device (4) for opening and closing the poppet valve (3). The hydraulic servo drive device (4) is constructed from a three-port (FIG. 2) or four-port servo valve. |
