Hot and cold water mixing device

A control mechanism of a hot and cold water mixing device, comprising:

• a main body having an inner chamber, and a hot water port and a cold water port formed in a circumferential surface thereof,
• a valve element disposed in the inner chamber of the main body and having an operating shaft and a contact portion at one end thereof,
• a temperature-sensitive spring disposed in the inner chamber for biasing the valve element at one side thereof,
• a bias spring disposed in the inner chamber for biasing the valve element at a side opposite to the temperature-sensitive spring and allowing the operating shaft to extend inside the bias spring, said bias spring having at one side a regulating member contact surface which contacts at least indirectly the contact portion of the valve element, and a valve element contact surface at the other side, and
• a regulating member associated with the valve element for controlling a position of the valve element and changing a biasing force of the bias spring, said regulating member being disposed at a side of the bias spring away from the valve element to change a flowing rate of hot water and cold water to obtain water mixture at a desired temperature, and having a contact surface at least indirectly contacting the valve element contact surface of the bias spring so that when the hot water port is closed, the bias spring and the temperature-sensitive spring act on the valve element to securely close the hot water port.