The heating period is coming to an end. Should the inlet and outlet valves of the heating system be closed before the end of the heating period for full water maintenance or not?

Answer: Close the inlet and outlet valves.

Because the pipeline is full of water, the pipeline will not rust without air.

You are worried that there will be no water leakage during the non-heating period, because there will be no water leakage under such a large pressure when heating, and there will be no water leakage after the pressure is reduced after stopping heating.

Extended data:

After stopping heating, the heating valve at home needs to be turned off, because the main valve outside the unit has been closed by the property.

Try to turn it off. The valve at home is always open and closed, which is easy to damage. It's very troublesome to replace. Try to close the main valve in the corridor. If the main valve is broken, it belongs to property maintenance, and if the indoor valve is broken, it belongs to self-maintenance.

References:

Baidu encyclopedia-backwater temperature control valve