Please help
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There is a root seal tube, which is connected below and inserted into the tank, with a vacuum on the upper side. Through the mirror above, it is possible to see what causes liquid to always flow back up from inside the tube
Check the pressure difference above and below the liquid seal tube
The vacuum level above is too high, and the height of the liquid column in the liquid seal tube is insufficient.
This post was last edited by ylb913 on 2016-4-30 at 18:44. This is normal; this liquid seal actually serves as a drainage mechanism for the negative pressure system. The system is under negative pressure, and a water seal facing the atmospheric pressure is inserted into its pipes; the liquid level in the inlet pipes will definitely be higher than that in the water seal tank. The atmospheric pressure outside the water seal tank = the pressure inside the system (negative pressure) + the atmospheric pressure corresponding to the height of the water column. Roughly speaking, 1 atmosphere corresponds to a water column of 10 meters.