Consultation on vent valve backpressure issues
Thread Content
Under normal operating conditions, the breather valve is open to the atmosphere. If a pipe is connected after the breathing valve, will the back pressure (positive or negative) behind the breathing valve affect its functionality? For example, if the normal exhaust pressure of a breathing valve is 1200 Pa, and the pressure behind the breathing valve is -500 Pa, will the breathing valve open in advance to allow air to escape (with the pressure in front of the breathing valve being 700 Pa at this time)?
It depends on how it is configured; for such valves, it’s best to refer to schematic diagrams to understand their principle of operation. For reference.
You can add me; the breathing valve is one of our regular products
Yes, and the choice of breather valve depends on whether the back pressure remains constant
I would like to ask: when calculating the amounts inhaled and exhaled, does the maximum gas volume in the storage tank refer to the space outside the filling coefficient of the tank, or rather to the total volume of the entire device?
The selection and fabrication of breather valves should be based on the required ventilation capacity of the storage tank as well as the backpressure conditions; reference can also be made to SH/T3007-2014 or API2000 for selection purposes. In the event of backpressure, manufacturers must select the weight of the valve disc or the spring loading pressure when producing breathing valve discs, based on the level of backpressure.