Single ibhola shuttle ivelufa kunye 3 izibuko kwi-line imibhobho: xa izibuko V1 kunyeI-V2 ixhunywe kwimigca ye-2 yomsebenzi, i-valve ihambisa i-valve ephezulu kwiingcinezelo ze-2kwizibuko eliqhelekileyo C. Ibhola enye ivumela ukubola komqondiso woxinzeleloxa omabini amazibuko omsebenzi ehla ukuya kwinqanaba eliphantsi loxinzelelo.