Motor-driven high-airflow electro-pneumatic valve for commercial vehicle

The invention discloses a motor-driven high-airflow electro-pneumatic valve for a commercial vehicle. The motor-driven high-airflow electro-pneumatic valve for the commercial vehicle comprises a valvedevice which is provided with at least one inlet, an outlet and an exhaust, and comprises at least one air inlet valve seat and at least one exhaust valve seat, wherein the exhaust valve seat is opened and closed by a piston; the air inlet valve seat is closed and opened by a seal driven to move by the piston; and the position of the piston is defined by balance of pressure, contact force and spring force which are exerted on the piston by an electromechanical device. The motor-driven high-airflow electro-pneumatic valve for the commercial vehicle is characterized in that the electromechanical device comprises a rotary motor and a mechanical transmission device, and the mechanical transmission device converts rotational motion of the motor into linear compression of a spring. Only a single electromechanical devic