1. Select according to the air permeability
The purpose of installing the vent valve is to maintain the air pressure balance inside and outside of the cavity, so we need to calculate the gas pressure change in the cavity and the air permeability of the air vent valve per unit time, and the matching between the two is appropriate. The air permeability of the air valve is mainly determined by the air permeability film inside, and the porosity on the air permeability film is the key to determine the air permeability. Using the closed chamber gas balance formula P = V / T * constant (T is absolute temperature, 273 + C), according to the actual equipment data to calculate the results, so that you can pick out the appropriate air vent valve.
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