Valavu yolumikizira ndi yoyenera kudula ndi kuyika madzi mu mapaipi, chifukwa cha kapangidwe kake kosavuta, ili ndi ubwino wotsegula ndi kutseka mwachangu. Pa mndandanda uwu, NSEN ikhoza kupereka mtundu wosiyana, mtundu wa manja ndi Inverted Pressure Balance mtundu wothira mafuta. Takulandirani kuti mulumikizane nafe kuti mupeze mwayi kapena kusintha valavu ya polojekiti yanu.