Valve unit

A valve unit provided in a passage through which cooling water of an internal combustion engine circulates, the valve unit comprising:

• a thermo valve that opens and closes a main flow path depending on a temperature of the cooling water;
• a valve case including:
• a valve case main body in which the thermo valve is housed therein, and the main flow path is formed, and in which a valve seat which a valve body of the thermo valve seats on and unseats from is formed in the middle of the main flow path, and
• a sleeve formed to protrude outward from the valve case main body;
• a sub-flow path formed to include a cooling water storage chamber formed inside the sleeve, a lead-out passage communicating an upstream side of the valve seat of the main flow path with the cooling water storage chamber, and a lead-in passage communicating a main flow path on a downstream side of the valve seat of the main flow path with the cooling water storage chamber;
• and
• a sub-valve attached to the sleeve to open and close the sub-flow path,
• wherein the valve case main body and the sleeve each have a cylindrical shape, and are arranged such that an axis passing through a center of the valve case main body and an axis passing through a center of the sleeve intersect, the sleeve protrudes outward from the valve case main body in a radial direction of the cylindrical shape of the valve case main body, and
• the valve seat is disposed in a region facing an opening end portion of the sleeve on the valve case main body side in an axial direction of the valve case main body.