Valavu yoyendera mphira yosindikizirandi mtundu wa valve yowunikira yomwe imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana kuti azitha kuyendetsa madzi. Ili ndi mpando wa rabara womwe umapereka chisindikizo cholimba ndikuletsa kubwereranso. Valavu idapangidwa kuti izipangitsa kuti madzi aziyenda mbali imodzi ndikulepheretsa kuti zisayende mbali ina.

Chimodzi mwazinthu zazikulu za mphira wokhala pansi pa swing check valves ndi kuphweka kwawo. Zimapangidwa ndi hinged disc yomwe imatseguka ndikutseka kuti ilole kapena kuletsa kutuluka kwamadzi. Mpando wa mphira umatsimikizira chisindikizo chotetezeka pamene valavu yatsekedwa, kuteteza kutuluka. Kuphweka uku kumapangitsa kukhazikitsa ndi kukonza kukhala kosavuta, ndikupangitsa kukhala chisankho chodziwika bwino pamapulogalamu ambiri.

Chinthu chinanso chofunika kwambiri cha ma valve oyendetsa mphira-mpando wa rabara ndi kuthekera kwawo kugwira ntchito bwino ngakhale pakuyenda kochepa. Kusuntha kwa disc kumapangitsa kuyenda kosalala, kopanda zopinga, kuchepetsa kutsika ndikuchepetsa chipwirikiti. Izi zimapangitsa kuti ikhale yabwino kwa mapulogalamu omwe amafunikira mitengo yotsika, monga mipope yapakhomo kapena njira zothirira.

Kuphatikiza apo, mpando wa rabara wa valve umapereka zinthu zabwino kwambiri zosindikizira. Ikhoza kupirira kutentha ndi kupanikizika kosiyanasiyana, kuonetsetsa chisindikizo chodalirika, cholimba ngakhale pansi pa ntchito zovuta. Izi zimapangitsa kuti ma valve oyendera mphira akhale oyenera kugwiritsidwa ntchito m'mafakitale osiyanasiyana, kuphatikiza kukonza mankhwala, kukonza madzi, mafuta ndi gasi.

Valavu yotsekedwa ndi mphira ndi chida chosunthika komanso chodalirika chomwe chimagwiritsidwa ntchito kuwongolera kutuluka kwamadzi m'mafakitale osiyanasiyana. Kuphweka kwake, kuchita bwino pamayendedwe otsika, katundu wosindikiza bwino komanso kukana kwa dzimbiri kumapangitsa kukhala chisankho chodziwika bwino pamapulogalamu ambiri. Kaya amagwiritsidwa ntchito m'mafakitale opangira madzi, makina opangira mapaipi a mafakitale kapena malo opangira mankhwala, valavu iyi imaonetsetsa kuti madzi akuyenda bwino, oyendetsedwa bwino ndikulepheretsa kubwereranso kulikonse.