2. If the inlet valve and the outlet valve are in the same position and height.
(1) Determine the inlet and outlet valves according to the inlet pipe with high temperature and the outlet pipe with low temperature.
(2) Observe the partition inside the heater. A water inlet pipe with fewer radiators and a water outlet pipe with more radiators.
Generally, the red pipe is the water inlet pipe and the blue pipe is the water outlet pipe.
Turn the handwheel clockwise when the valve is open and counterclockwise when the valve is closed. The valve opens horizontally and closes vertically; The small valve opens vertically and closes horizontally.