Ama-valves sango le-ANSI ayingxenye ebalulekile emikhakheni yemishini yezimboni kanye ne-valve, eyenzelwe ikakhulukazi ukulawula ukugeleza koketshezi namagesi ezinhlelweni ezahlukahlukene zamapayipi. Lawa ma-valve abonakala ngokwakhiwa kwawo okulula kodwa okusebenzayo, okuqukethe isango elimise okwe-wedge elihamba phezulu naphansi ukuvula noma ukuvala indlela yokugeleza. Isikhundla se-ANSI (American National Standards Institute) en