Valve device

A valve device comprising:

• a drive device that is configured to output a rotational force;
• a shaft that is configured to be rotated about a shaft central axis by the rotational force outputted from the drive device;
• a stationary disk that has at least one passage hole which is configured to conduct a fluid through the at least one passage hole;
• a rotor that is configured to be rotated about the shaft central axis in response to rotation of the shaft to adjust a flow rate of the fluid flowing in the at least one passage hole;
• a housing that is shaped in a bottomed tubular form and has a housing central axis which extends in parallel with the shaft central axis, wherein the housing has a peripheral wall which surrounds the housing central axis and receives the stationary disk and the rotor while an opening is formed at the peripheral wall on one side in an axial direction of the housing central axis;
• a drive device case that receives the drive device and has an opening closure portion, wherein the opening closure portion corresponds to a shape of the opening and closes the opening;
• and
• a seal member that is shaped in a ring form and seals a radial gap all around the housing central axis between the peripheral wall and the opening closure portion, wherein:
• the stationary disk has a stationary outer periphery which is opposed to the peripheral wall, wherein the stationary outer periphery has a rotation stop projection which radially projects toward an inner periphery of a disk opposing portion of the peripheral wall which is radially opposed to the stationary disk;
• the housing has a receiving groove which is formed only at the inner periphery of the disk opposing portion of the peripheral wall and receives the rotation stop projection, wherein the housing central axis is positioned at a location where the housing central axis is eccentric with respect to the shaft central axis;
• an inner diameter of a portion of the peripheral wall, which extends from the disk opposing portion to the opening, is increased relative to an inner diameter of the disk opposing portion without the receiving groove and is set to enable insertion of the rotation stop projection of the stationary disk from the opening to the receiving groove;
• and
• the seal member is eccentric with respect to the shaft central axis, and thereby a distance, which is measured between the housing central axis and a center of the seal member along a cross section of the seal member that is perpendicular to the axial direction of the housing central axis, is smaller than an amount of eccentricity between the shaft central axis and the housing central axis.