Iivalvu zebhabhathane zisetyenziswa kwizicelo ezahlukeneyo ezifana nezityalo zokucocwa kwamanzi, ukwenziwa kokutya, izityalo zemichiza, njl.njl. Ezi zivalo zinempembelelo kwimisebenzi kula mashishini ngelixa zilindele ukuthunyelwa.Ngokomzekelo, kwindawo yokucoca amanzi, apho indima ephambili yeevalve kukulawula ukuhamba kwamanzi, ixesha lokuphumla ngenxa yee-valve ezingafumanekiyo kunokukhokelela ekuboneleleni kwamanzi acocekileyo, anokuba yingozi kwimpilo yabantu.

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