Ivalvu iyisisetshenziswa esiwumshini esilawula ukugeleza, ukugeleza, ukugeleza, ukucindezela, izinga lokushisa, njll. koketshezi olugelezayo, futhi i-valve iyingxenye eyisisekelo ohlelweni lwamapayipi. Ukufakwa kwamavalvu kuyafana ngokobuchwepheshe namaphampu futhi kuvame ukuxoxwa njengesigaba esihlukile. Ngakho yiziphi izinhlobo...
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