Where is the return valve of the big dipper heater water tank?

On the heating pipe. The backwater valve is a special anti-reflux device for automobiles, which is used to prevent the outflow water from re-entering through the drainage pipe of the house. It is located on the heating pipe, which is convenient for people to adjust the water flow speed of the heating. The Big Dipper refers to the Big Dipper car, which is the crystallization of aviation technology and Japanese technology and the perfect combination of technology and culture.