Dzvanya ruoko vhiri iko zvino seyakanyanya manyorero kudzora, uye kunyanya mukuita kuchera iri zvakare yakasarudzika dhizaini, nekuti akafunga chinhu chikuru ndicho chinangwa, nzvimbo uye maitiro ekushandisa, zviri nyore zviri nani, hongu, kuisa chikuru ndiko kudzora basa rekuchinja.
Manual control valve yakagadzirirwa kudzivirira kutadza kwemhepo yekupa kana kuputika kwechikonzero, iyo huru yekushandisa muenzaniso ndeye: emergency kutonhora masisitimu uye tsaona kudzora; yechipiri idambudziko rekudzora vharafu redunhu; pakupedzisira ndiko kubuda kwezviri pamusoro, zvinangwa zvikuru zvekutsika vhiri kana kushandisa handwheel kudzora akakosha mabasa.
