Le valve yenye yezona valve zifanelekileyo ezisetyenziswa kumashishini afana nokufudumeza kweedolophu, igesi yesixeko, ishishini leekhemikhali, amandla, umbhobho wegasi yendalo, ishishini elilula, ukutya, iimpahla njl. Emva kweminyaka yokuvavanywa kwemarike, umgangatho wemveliso ufikelela kwinqanaba elifanayo lemveliso efanayo phesheya. Ngoko ke inedumela elihle phakathi kwabasebenzisi.

Ishishini lenyukliya, ishishini leekhemikhali zepetroli, ishishini le-elektroniki kunye neshishini le-aerospace, kunye netekhnoloji yenkqubo ngokuzenzekelayo. . . . . . imfuno kwiivalvu zoshishino zehlabathi, kuquka ukuboma.