Valavu yowunikira chisindikizo cha mphirandi mtundu wa valavu yowunikira yomwe imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana kuti ilamulire kuyenda kwa madzi. Ili ndi mpando wa rabara womwe umapereka chisindikizo cholimba komanso choletsa kubwerera kwa madzi. Vavuyi idapangidwa kuti ilole madzi kuyenda mbali imodzi pomwe ikuletsa kuyenda mbali ina.

Chimodzi mwa zinthu zazikulu zomwe zimachititsa kuti ma valve otchingira otchingira atsekedwe ndi rabara ndi kuphweka kwawo. Amakhala ndi diski yokhala ndi hinged yomwe imatseguka ndikutseka kuti madzi asayende bwino. Mpando wa rabara umatsimikizira kuti valavuyo imatsekedwa bwino, zomwe zimapangitsa kuti madzi asatuluke. Kuphweka kumeneku kumapangitsa kuti kuyika ndi kukonza kukhale kosavuta, zomwe zimapangitsa kuti ikhale chisankho chodziwika bwino m'njira zambiri.

Chinthu china chofunika kwambiri cha ma valve oyesera swing okhala ndi mpando wa rabara ndi kuthekera kwawo kugwira ntchito bwino ngakhale madzi atakhala ochepa. Kuyenda kwa disc komwe kumazungulira kumalola kuti madzi aziyenda bwino, popanda zopinga, kuchepetsa kutsika kwa mphamvu komanso kuchepetsa kugwedezeka. Izi zimapangitsa kuti ikhale yoyenera kugwiritsa ntchito zomwe zimafuna madzi otsika, monga mapaipi apakhomo kapena makina othirira.

Kuphatikiza apo, mpando wa rabara wa valavu umapereka mphamvu zabwino kwambiri zotsekera. Umatha kupirira kutentha ndi kupsinjika kosiyanasiyana, zomwe zimapangitsa kuti chisindikizo chodalirika komanso cholimba ngakhale pakakhala zovuta pakugwira ntchito. Izi zimapangitsa kuti mavavu oyesera a rabara akhale oyenera kugwiritsidwa ntchito m'mafakitale osiyanasiyana, kuphatikizapo kukonza mankhwala, kukonza madzi, ndi mafuta ndi gasi.

Valavu yotchingira yotsekedwa ndi rabara ndi chipangizo chodalirika komanso chosavuta kugwiritsa ntchito powongolera kuyenda kwa madzi m'mafakitale osiyanasiyana. Kusavuta kwake, kugwira ntchito bwino pamlingo wotsika wa madzi, kutseka bwino kwabwino komanso kukana dzimbiri kumapangitsa kuti ikhale chisankho chodziwika bwino pa ntchito zambiri. Kaya imagwiritsidwa ntchito m'malo oyeretsera madzi, makina opangira mapaipi a mafakitale kapena malo opangira mankhwala, valavu iyi imatsimikizira kuti madzi amayenda bwino komanso moyenera pamene akuletsa kubwerera kwa madzi.