Valve device for an internal combustion engine

A valve device for an internal combustion engine, the valve device comprising:

• a pneumatically actuated actuator;
• a housing comprising an inlet and an outlet;
• a valve rod which is configured to be moved by the pneumatically actuated actuator;
• a valve closing member which is attached to the valve rod and which is configured to be lowered onto and to lifted off of a first valve seat;
• a non-return plate which is loaded via a spring force in a direction of at least one second valve seat, at least one flow-through cross section being formed fluidically between the inlet and the outlet which can be opened and closed by the valve closing member and the non-return plate;
• and
• at least one sealing lip which is formed on the at least one second valve seat or on the non-return plate, the at least one sealing lip being arranged to extend from the at least one second valve seat in a direction of the non-return plate or from the non-return plate in a direction of the at least one second valve seat, the at least one sealing lip being formed with a free end which is inclined in a direction of a side on which a higher pressure is applied when the non-return plate rests on the at least one second valve seat
• wherein,
• an undercut is formed on a side of the at least one sealing lip which faces the side of the higher pressure when the non-return plate rests on the at least one second valve seat.