The overpressure at which the valve opens depends on the surface tension of the carrier liquid and the mean pore diameter of the carrier material according to the equation p = 2 gamma/R, where {HEAD ~ gamma} is {TAIL ~ the surface tension} and R the mean pore diameter of the carrier material 
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The overpressure at which the valve opens depends on the surface tension of the carrier liquid and the mean pore diameter of the carrier material according to the equation p = 2 gamma / R , where { HEAD ~ gamma } is { TAIL ~ the surface tension } and R the mean pore diameter of the carrier material
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