Turn the valve to the right to close, and to the left to open; if the valve displays a number, the number 5 is the largest, and the number 1 is the smallest; if the valve displays a pattern, it can be rotated according to the mark, and the sun is the largest , Snowflake is off. The return water temperature of the radiator can be controlled on the return water branch pipe of each group of radiators in a double-pipe heating system or a single-pipe heating system with a closed pipe.
