Check valve opening pressure
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I would like to ask my friends: what is the opening pressure of a swing check valve? What type of check valve should be used for the check valve on the nitrogen inlet pipeline of the storage tank’s nitrogen seal?
One should first understand the pressure of the nitrogen seal, as well as the pressure difference with the pressure source that supplies the nitrogen seal. For reference.
Under normal conditions, it should be no less than 0.1 MPa
I asked around, and some manufacturers said that 1 KPa is sufficient to open it.
I’m not sure about swing check valves, but for axial flow check valves, the standards specify that the opening pressure must not exceed 2 KPa. As for the selection, what is your approximate operating pressure?
The check valve can operate at very low pressures and its settings can be adjusted; ask the supplier about this. As for the nitrogen seal, it depends on your process requirements
May I ask, which standard does this come from?
Replying to the person above: GB/T21387 axial flow check valve