Ivalve yebhola yokutshixa itshixa uluhlu lwemibhobho eyahlukeneyo ngokubamba isiphatho kwindawo OKUVALIWE.Isixhobo sethu esincinci sokuvala ivalve siya kutshixa iidayamitha zombhobho ukusuka kwi-1/2′ ukuya kwi-3′.Ivalve yethu enkulu yebhola yokuvala ukhuseleko itshixa ububanzi bombhobho ukusuka kwi-2 ukuya kwi-8′.Izixhobo zezixhobo zikwahluka ngokwesicelo.Kukwakho nentsimbi esemgangathweni yokuvalwa kwevalve yebhola, kodwa inokutshixwa kuphela.