Vent valve exhaust/inlet pressure?
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How can the exhaust/inlet pressure of a breathing valve be determined accurately? Thank you!
Find the manufacturer’s samples; they contain detailed data. I remember there are three settings.
The pressure settings for breather valves are generally specified as levels A, B, C, and D; this can be seen in many places, so I won’t go into details here. As for how to determine positive and negative pressures, I have my own views, as follows: 1. First, it is necessary to determine the size of the tank (which in turn determines the diameter and number of breather valves) ； 2. Determine the pressure level in the tank when material enters and when it is discharged to its maximum value ； 3. Determine the rated flow rate of the pump at the feed inlet, and then take into account the effect of thermal expansion and contraction on the tank, in order to finally determine the ventilation volume of the storage tank ； 4. The maximum pressure that the tank wall can withstand. By combining the above four points, the opening pressure of the breather valve can be determined, thereby ensuring the safety of the storage tank.
Take a look at this article. “Determination of the breathing volume of atmospheric and low-pressure storage tanks and selection of breather valves” http://wenku.baidu.com/view/d238c2cfa1c7aa00b52acb4d.html