Valofo e laolang mouoane ke karolo e nyenyane empa ke karolo ea bohlokoa ea mechine eo mouoane o sebelisoang ho eona. E laola ho phalla ha mouoane ho thusa ho netefatsa hore mechine e sebetsa hantle. Sehloohong sena re tla be re fumana hore na ke hobane'ng ha u tla hloka valve e laolang mouoane le hore na ke hobane'ng ha valve e sebelisoa lifekthering.
Steam governor valve Nahana ka lebone la sephethe-phethe bakeng sa mouoane. E laola hore na mouoane o tsamaea hakae ho tloha ka boiler ho ea mochine (ho netefatsa hore molumo o nepahetseng o romelloa ka nako e nepahetseng). Taolo ena e bohlokoa hobane mouoane o feteletseng o ka senya lisebelisoa, 'me hanyenyane haholo o ka etsa hore se sebetse hantle.