Pamene valavu ya bi-directional ikufunika kuti muyang'ane kutsogolo ndikuletsa kubwerera, NSEN zitsulo zokhala pansi pa bi-directional butterfly valve ndizo zomwe mungasankhe.Kusindikiza kumagwiritsa ntchito zitsulo zonse kukhala zitsulo, mndandandawu umagwiritsidwa ntchito kwambiri mu Power Plan, Central Heating, Mafuta & Gasi.Takulandilani kuti mutitumizireni kuti mutenge kalozera kapena kusintha valavu ya polojekiti yanu.