Valavu yachitetezo chapansi pamadzi (SCSSV)
Valavu yotetezera kutsika yomwe imayendetsedwa kuchokera kumtunda kudzera pa mzere wowongolera womangidwira kunja kwa chubu chopangira.Mitundu iwiri yofunikira ya SCSSV ndiyofala: yobweza mawaya, pomwe zida zazikulu zotetezera zimatha kuyendetsedwa ndikubwezedwa pa slickline, ndi ma chubu obweza, momwe gulu lonse lachitetezo limayikidwa ndi chingwe cha chubu.Dongosolo loyang'anira limagwira ntchito mopanda chitetezo, ndi mphamvu ya hydraulic control yomwe imagwiritsidwa ntchito potsegula mpira kapena msonkhano wa flapper womwe ungatseke ngati kuwongolera kutayika.
