Valavu ya Mphepo Yoyimirira

Mafotokozedwe Akatundu

Vavu yamkuntho ndi valavu yosabwerera yofanana ndi flap yomwe imagwiritsidwa ntchito kutulutsa zimbudzi pamwamba pa nyanja. Imalumikizidwa ndi chitoliro cha nthaka kumapeto kwina ndipo kumapeto kwina kuli m'mbali mwa sitima kuti zimbudzi zikwere pamwamba pa nyanja. Chifukwa chake imatha kukonzedwanso pokhapokha ngati pali malo owuma.

Mkati mwa valavu muli chogwirira cha valavu chomwe chimalumikizidwa ndi cholemera chopondera, ndi chotchingira. Chotchingira ndi chidutswa cha valavu chomwe chimayendetsedwa ndi gudumu lakunja lamanja kapena choyendetsera. Cholinga cha chotchingira ndikugwira chotchingiracho pamalo pake chomwe chimaletsa kuyenda kwa madzi.

Akayamba kuyenda, woyendetsa ayenera kusankha ngati atsegula chipika chotseka, kapena kuchisunga chotseka. Ngati chipika chotseka chatsekedwa, madziwo sadzatuluka mu valavu. Ngati chipika chotseka chatsegulidwa ndi woyendetsa, madziwo amatha kuyenda momasuka kudzera mu chivundikirocho. Kupanikizika kwa madziwo kudzatulutsa chivundikirocho, zomwe zimamulola kuyenda kudzera mu chotulutsira mpweya mbali imodzi. Pamene madziwo asiya kuyenda, chivundikirocho chidzabwerera chokha pamalo ake otsekedwa.

Kaya chipika chotseka chilipo kapena ayi, ngati madzi atuluka kudzera mu chotulutsira madzi, madzi akumbuyo sadzatha kulowa mu valavu chifukwa cha counterweight. Izi ndi zofanana ndi valavu yoyang'anira komwe madzi akubwerera amaletsedwa kuti asadetse dongosolo. Chogwirira chikatsitsidwa, chipika chotseka chidzagwiranso chivundikirocho pamalo ake oyandikira. Chivundikiro chotetezedwa chimalekanitsa chitolirocho kuti chikonzedwe ngati pakufunika kutero.