The invention discloses a constant-temperature circulating valve. The constant-temperature circulating valve comprises a valve body, an adjusting temperature
bulb and a sterilizing temperature
bulb are arranged in the valve body, the lower end of the adjusting temperature
bulb and the lower end of the sterilizing temperature bulb are each sleeved with a working spring, the middle of the adjustingtemperature bulb and the middle of the sterilizing temperature bulb are sleeved with a control
piston and a bypass
piston respectively, and the upper end of the adjusting temperature bulb and the upper end of the sterilizing temperature bulb are each fixedly connected with a spring seat. According to the constant-temperature circulating valve and the mounting and using method thereof, in a domestic hot water
system, in order to ensure that each hot water circulating
branch of a
water supply system reaches the required temperature, ensure that hot water can be used immediately after being opened and effectively prevent
legionella breeding, the flow of a circulating loop is adjusted so that the phenomenon of different loop water temperatures can be avoided, the design of different-
stroke loops with automatic balance of the hot water
system is realized, the pipeline investment is reduced, more comfortable experience is realized, the thermal sterilization requirement can be met, and a settemperature can be automatically maintained when the constant-temperature circulating valve is installed in each loop of the hot
water circulation system.