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I-valve yesango le-ANSI yeyona nto ibalulekileyo kwizixhobo zeshishini nakwicandelo leevalve, uyilelwe ikakhulu ukulawula ukuhamba kolwelo kunye negesi kwiinkqubo ezahlukeneyo zokuhamba. Ezi valve zibonakaliswa kuyilo lwazo olulula kodwa olusebenzayo, eliqukethe isango elimile okwenziwe elihamba phezulu nasezantsi ukuvula okanye ukuvala indlela yokuhamba. I-ANSI (iZiko leMigangatho yeSizwe laseMelika)