Hot water and cold water mixing apparatus

A hot water and cold water mixing apparatus comprising:

• a cold water channel into which cold water is supplied from a cold water supply source,
• a hot water channel into which hot water is supplied from a hot water supply source,
• a tubular valve body arranged movably in an axial direction thereof, the valve body being configured to adjust an introduction amount of the cold water from the cold water channel and an introduction amount of the hot water from the hot water channel by moving in the axial direction thereof,
• a valve case covering an outer side of the valve body, and
• an annular hot water and cold water partition member arranged between an outer surface of the valve body and an inner surface of the valve case, the annular hot water and cold water partition member being configured to divide a gap therebetween into a cold water gap communicating with the cold water channel and a hot water gap communicating with the hot water channel,
• wherein
• a groove portion for receiving the annular hot water and cold water partition member is provided on the inner surface of the valve case,
• the groove portion has at least one pair of side walls,
• the annular hot water and cold water partition member is configured to come into close contact with one side wall on a hot-water-gap side of the at least one pair of side walls of the groove portion and with only one of the outer surface of the valve body so that communication between the cold water gap and the hot water gap is shut off and not to come into close contact with a surface facing the valve body of the inner surface of the valve case, under a state in which there is a differential pressure between the cold water gap and the hot water gap in a direction from the cold water gap toward the hot water gap, and
• the annular hot water and cold water partition member is configured to come into close contact with one side wall on a cold-water-gap side of the at least one pair of side walls of the groove portion and with only the outer surface of the valve body so that communication between the cold water gap and the hot water gap is shut off and not to come into close contact with a surface facing the valve body of the inner surface of the valve case, under a state in which there is a differential pressure between the cold water gap and the hot water gap in a direction from the hot water gap toward the cold water gap.