Valve device

A valve device comprising:

• a housing that has a passage configured to conduct fluid;
• a flow hole forming portion that is fixed at the passage of the housing and includes:
• a plurality of flow holes, each of which is configured to conduct the fluid;
• and
• at least one partition which is placed between corresponding adjacent two of the plurality of flow holes;
• a rotor that is placed in the passage of the housing and is configured to rotate about a rotational axis which is predetermined, wherein the rotor includes:
• a passage opening which is configured to communicate with a corresponding predetermined flow hole among the plurality of flow holes of the flow hole forming portion according to a rotation angle of the rotor;
• and
• a closing portion which is configured to close a rest of the plurality of flow holes that is other than the corresponding predetermined flow hole;
• and
• a drive device that is configured to output a torque which rotates the rotor, wherein:
• a circle, which is centered on the rotational axis of the rotor and is perpendicular to the rotational axis, is defined as an imaginary circle;
• an opening edge of the passage opening of the rotor has a radial section, wherein the radial section faces in a circumferential direction of the imaginary circle and extends along an imaginary line which extends in a radial direction of the imaginary circle;
• and
• the at least one partition of the flow hole forming portion has:
• a parallel portion which extends in parallel with the radial direction of the imaginary circle;
• and
• a progressively varying portion which is placed on an outer side of the parallel portion in the radial direction, wherein a width of the progressively varying portion, which is measured in the circumferential direction, is progressively increased toward the outer side in the radial direction.