Coolant control valve apparatus

A coolant control valve apparatus comprising:

• a main valve that controls the flow rate of coolant in a main channel of an engine cooling system circulating the coolant between an engine and a radiator;
• a detour channel diverging from the main channel as a detour for the coolant from the valve to flow away from the main channel;
• a secondary valve moved independently from the main valve to open and close the detour channel;
• and
• a temperature detection medium that drives movement of the secondary valve to open and close the detour channel, and can open and close the secondary valve according to a temperature of the coolant,
• wherein the temperature detection medium is disposed in a diverging part between the detour channel and a bypass channel of the engine cooling system directing the coolant leaving the engine to bypass the radiator and return to the engine,
• wherein the coolant is regularly flown out of the engine, and the temperature detection medium is in the bypass channel,
• wherein the coolant that is flown in the bypass channel is regularly in contact with the temperature detection medium,
• wherein the main valve is a rotary valve provided with a rotor and includes a controlling means that controls a rotation angle of the rotor,
• wherein the controlling means includes a power transmission mechanism having a gear train, and
• wherein the secondary valve is a fail-safe valve that is driven by the temperature detection medium to be opened from a closed state according to a change of a detected temperature, and to be opened when the temperature of the coolant becomes a predetermined temperature or higher.