Ha u khetha le ho sebelisa lihlahisoa tsa li-valve tsa ho hlahloba, ho hlokahala hore u be le kutloisiso e hlakileng ea molao-motheo oa valve ea ho hlahloba e le hore u khethe valve e nepahetseng ea ho hlahloba le ho atolosa bophelo ba eona ba tšebeletso. Molao-motheo oa ts'ebetso eaho hlahloba valve ke ka tsela e latelang: valve ea ho hlahloba e lumella mokelikeli ho phalla ka tsela e itseng 'me e thibela mokelikeli ho phalla morao kapa ka lehlakoreng le leng. Li-valve tse nepahetseng tsa ho hlahloba li lokela ho qala ho koala ha khatello e theoha phala 'me matla a kinetic a mokelikeli a fokotseha. Ha tataiso ea phallo ea mokelikeli e fetoha, valve ea ho hlahloba e lokela ho koaloa ka ho feletseng.
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