Ivalve yokukhangela kukuxhomekeka ekuhambeni kwe-medium ngokwayo kwaye ivule ngokuzenzekelayo kwaye ivale i-disc yevalve, esetyenziselwa ukuthintela i-valve ye-media umva, eyaziwa ngokuba yi-valve yokutshekisha, i-valve yendlela enye, ivalve ye-countercurrent, kunye nevalve yoxinzelelo lwangasemva.Khangela intshukumo yevalve Khangela ivalve luhlobo oluzenzekelayo lweva...
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