Valve device in a motor vehicle

A valve device for a fuel cell arrangement in a motor vehicle, the valve device comprising:

• a housing;
• a flow channel that extends in the housing;
• a shaft mounted rotatably in the housing, the shaft having a screw bore having a shoulder;
• a flap fastened to the shaft, the flap being configured to influence a flow cross section in the flow channel;
• a screw having a collar, the screw being configured to fixedly attach the flap to the shaft;
• a drive configured to drive the flap via the shaft;
• and
• a valve seat arranged in the flow channel, the valve seating having a seal arranged on a radially circumferential edge of the flap, the seal being in contact with the valve seat in a closed position of the flap such that the shaft penetrates the flap at an angle,
• wherein the collar of the screw contacts the shoulder of the screw bore of the shaft such that, when the screw is tightened firmly, a transmission of force from the collar to the shaft takes place via the shoulder.