Control valve

A control valve comprising:

• a casing which has an inflow port for a liquid flowing in from outside and a plurality of outflow ports for causing a liquid that has flowed into an inside to flow out to outside;
• a valve body which is rotatably disposed inside the casing and in which valve holes are formed in a circumferential wall portion;
• seal tube members of which one end portion communicates with any of the outflow ports and of which the other end portion abuts an outer circumferential surface of the circumferential wall portion and is opened and closed by the corresponding valve hole;
• a fuel passage which causes the inside of the casing and any of the outflow ports to communicate with each other;
• and
• a thermostat which opens and closes the fuel passage in response to a detected temperature,
• wherein a communication groove for causing the inflow port and an upstream portion of the thermostat in the fuel passage to communicate with each other is formed on an inner circumferential surface of the casing by partially expanding a gap between the circumferential wall portion and the casing.