Coolant control valve unit having sealing structure

A coolant control valve unit having a sealing structure, the control valve unit comprising:

• a rotary valve provided with a valve coolant passage formed from an inner circumferential surface to an outer circumferential surface of the rotary valve;
• a valve housing in which the rotary valve is rotatably provided;
• a fitting coupled to the valve housing at a position corresponding to the valve coolant passage, and provided with a fitting coolant passage corresponding to the valve coolant passage;
• and
• a sealing unit provided between a front surface of the fitting and the outer circumferential surface of the rotary valve,
• wherein the sealing unit includes:
• a sealing ring being in contact with the outer circumferential surface of the rotary valve to realize a slidable relationship therebetween;
• and
• a rubber ring provided on the front surface of the fitting, and bringing the sealing ring into close and elastic contact with the outer circumferential surface of the rotary valve,
• wherein the rubber ring has an X-shaped cross-section, with a front groove being formed along a center of a front surface of the rubber ring, a rear groove being formed along a center of a rear surface of the rubber ring, an inner groove being formed along an inner surface of the rubber ring to be directed toward a center of the fitting coolant passage, and an outer groove being formed oppositely to the inner groove.