I-valve ye-Angle yi-valve yeglobhu ye-angular, i-valve ye-angle ifana ne-valve yebhola, isakhiwo sayo kunye neempawu ziguqulwa kwi-valve yebhola.Umahluko kunye nevalve yebhola kukuba ukuphuma kwevalve ye-engile ikwi-engile eyi-90 ekunene ukuya kwindawo yokungena.