As for the idling of the water meter, it turns when the gate is closed and when the gate is opened.

The real reason is that water companies and properties make money! This water meter flow test 100% is qualified. We know that tap water contains a certain amount of gas, especially in families that have not moved in yet. The gas in the tap water pipeline will accumulate more and more, and the pressure of tap water will not be constant, but will change with the water consumption of surrounding households. According to the principle of Clabron equation, at the same temperature, the volume of gas is inversely proportional to the pressure, so when the pressure is high, the air in the pipeline will be compressed, and the tap water will be read by the water meter. The most hateful thing is as follows. There is a setting in the water meter. When the pressure in the pipeline decreases and the tap water flows back, the pointer of the water meter is blocked and the reading is almost unchanged. After a long time, the water meter only goes forward to read, which is idling. This was discovered by families who did not stay. What about the families who have already checked in? I didn't even notice. As a result, the property overcharged the owner's tap water, and the tap water company certainly made more money by doing so.

This behavior of mine is an act of smashing people's jobs, and it may be annoying!