1.Dlulisa imithombo yamanzi yangaphakathi nangaphandle
2.uma umfutho wamanzi uphakeme kakhulu, ungalungiswa ku-valve ye-angle, ungalungisa ukucindezela kwamanzi ngokuwehlisa kancane.
3.Umsebenzi oyinhloko we-engeli valve ukulawula amanzi.Uma umpompi unenkinga yokuvuza, umsebenzisi angavala i-valve ye-engeli ukuze avale amanzi, esikhundleni sokuvala i-valve eyinhloko yendlu.Lokho kuzoba lula futhi kusheshe ukushintsha noma ukulungisa umpompi.