Lapho i-valve ivalwa ngokuzumayo, amagagasi okwethuka akhiqizwa futhi abangele umonakalo kuma-valve ngenxa yokucindezela okukhulu okubangelwa ubuningi bamanzi agelezayo, okubizwa ngokuthi isando samanzi esihle.Ngokuphambene nalokho, lapho i-valve evaliwe ivuleka ngokuzumayo, izophinde ikhiqize ...
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