Ivalvu yebhola yasezimbili yezinhlobo yezinhlelo yokugcina, ikhona kusukela kwiqembu levalvu, ibhola, isithunzi sevalvu, isicubeko sezingqinamba kanye nezinye izinto. Iqembu levalvu liyiswe ngeminyaka emibili, elilungiswe ngokuhlanganyela ngamabhulokisi kanye nezinhlanganisela ezinye ukuze lithole iqembu levalvu elikhona. Ibhola liboniswa ngaphakathi kweqembu levalvu, futhi ukuvula nokufunga kwebhola kubhekwa ngokuhamba kwesithunzi sevalvu, ukuze kufikelelekele izinyathelo nokugqoka kwezinto.

Isizathu sokusebenza sevalvu yebhola yasezimbili yezinhlobo yokugcina noma yokugqoka ivalvu ngokuhamba kwesithunzi sevalvu. Ngokokuhamba kwesithunzi sevalvu, uma isithunzi sevalvu sikhomba, ibhola libhomba nalo. Eposisweni elikhutshwe, ibhola libekelelwa ngokugqoka kwezinyathelo zokumelana kwezithunzi sevalvu, ekwakhiweni isigqoko. Uma kufanele ivalvu libanjwe, hamba isithunzi sevalvu ukuze ubekele ibhola ekhishini kanye nezinyathelo zingaphezu kwevalvu. Ngokushesha, uma ivalvu kufanele libanjwe, ukuhamba kwesithunzi sevalvu kwenza ibhola libekelele kahle ekhishini futhi libophelela ukugqoka kwezinyathelo zokumelana.