8. Ukuze uvimbele ukulimala kwemishini okubangelwa ukugcwala ngokweqile, kunevalvu yokukhipha okuzenzakalelayo elayisha kakhulu emshinini wokudonsa amanzi. Lapho into edonsiwe idlula umthwalo olinganiselwe, i-valve yokulayisha ngokweqile izozikhulula ngokuzenzakalelayo, futhi esikhundleni salokho kusetshenziswa i-hydraulic puller ene-tonnage enkulu.