Valve device

A valve device for controlling a coolant used in an automobile, the valve device comprising:

• a valve member that includes
• a shaft portion rotatable about a rotation axis, and
• a rotor connected to an end of the shaft portion, wherein the end of the shaft portion is an end in a first direction along the rotation axis, and wherein on an outer circumferential surface of the rotor there is a first flow path with a first opening;
• a housing that includes
• an accommodating portion for accommodating the valve member, and
• a second flow path having a second opening communicable with the first opening, the accommodating portion having on its inner circumferential surface the second opening;
• and
• a first seal disposed between an outer circumferential surface of the rotor and an inner circumferential surface of the accommodating portion,
• wherein:
• the rotor includes a first region on which a coolant pressure acts in the first direction within the accommodating portion, and a second region on which the coolant pressure acts in a second direction opposite to the first direction, and
• a first area of the first region is below a second area of the second region.