Samfuran naúrar rabuwar iska mai ruwa duka na iya zama ɗaya ko fiye na ruwa oxygen, nitrogen ruwa da argon ruwa, kuma ƙa'idarsa ita ce kamar haka:
Bayan tsarkakewa, iskar ta shiga cikin akwatin sanyi, kuma a cikin babban ma'aunin zafi, tana musayar zafi tare da iskar gas don isa kusa da zafin jiki na liquefaction kuma ya shiga cikin ƙananan ginshiƙai, inda aka fara raba iska zuwa cikin iska mai wadatar nitrogen da iska mai wadataccen iskar oxygen. , Nitrogen saman yana takushe a cikin ruwa nitrogen a cikin injin daskarewa, kuma iskar oxygen a daya gefen yana ƙafe. Ana amfani da wani ɓangare na ruwa nitrogen a matsayin ruwan reflux na ƙasan ginshiƙi, kuma wani ɓangare na shi yana da sanyi sosai, kuma bayan ƙumburi, ana aika shi zuwa saman ginshiƙi na sama a matsayin ruwan reflux na babban ginshiƙi, da sauran ɓangaren. ana dawo dasu azaman samfuri.