Q:Kodi valavu yachitetezo cha boiler ya nthunzi imagwira ntchito bwanji ndipo imachita chiyani?

A: Valavu yachitetezo ndichinthu chofunikira kwambiri chachitetezo mu boiler. Ntchito yake ndi: pamene kupanikizika mu boiler ya nthunzi kumakhala kwakukulu kuposa mtengo wotchulidwa (ie kuthamanga kwa valavu yachitetezo), valavu yotetezera idzatsegula valavu kuti itulutse nthunzi kuti iwonongeke; pamene kupanikizika mu boiler kumatsikira pamtengo wofunikira (ie ), valve yotetezera imatsekedwa yokha, kotero kuti chowotchera chingagwiritsidwe ntchito motetezeka kwa nthawi pansi pa mphamvu yogwira ntchito. Kwa nthawi yayitali, pewani kuphulika komwe kumachitika chifukwa cha kuponderezana kwa boiler.
Cholinga cha kuyika ndi kusintha valavu yotetezera mu boiler ndikumasula mphamvu ndikukumbutsa boileryo pamene chotenthetsera chatsekedwa chifukwa cha zinthu monga vaporization, kuti akwaniritse cholinga chogwiritsa ntchito bwino. Ma boilers ena alibe valavu ya mpweya. Pamene madzi alowa mu ng'anjo yozizira kuti akweze moto, valavu yotetezera ikuchotsabe mpweya mu ng'anjo yamoto; imayenderera kutali.

Valavu yotetezera imakhala ndi mpando wa valve, pakati pa valve ndi chipangizo chothandizira. Ndimeyi mu valavu yotetezera imayankhulana ndi malo a nthunzi ya boiler, ndipo chigawo cha valve chimakanizidwa mwamphamvu pampando wa valve ndi mphamvu yokakamiza yopangidwa ndi chipangizo chokakamiza. Pamene mphamvu yopondereza yomwe valavu imatha kupirira ndi yaikulu kuposa momwe nthunzi imakokera pamphuno ya valve, pakati pa valve imamatira kumpando wa valve, ndipo valavu yotetezera imakhala yotsekedwa; pamene mphamvu ya nthunzi mu boiler ikukwera, mphamvu ya nthunzi yomwe ikugwira ntchito pachimake cha valavu Kuwonjezeka, pamene mphamvu yake imakhala yaikulu kuposa mphamvu yopondereza yomwe valavu imatha kupirira, chigawo cha valve chidzakwera pampando wa valve, valavu yotetezera idzatsegulidwa, ndipo chowotchera chidzasokoneza nthawi yomweyo.
Chifukwa cha kutuluka kwa nthunzi mu boiler, kuthamanga kwa nthunzi mu boiler kumacheperachepera, ndipo kukwera kwa nthunzi komwe valavu imatha kupirira kumachepetsedwa, yomwe imakhala yochepa kuposa mphamvu yopondereza yomwe valavu imatha kunyamula, ndipo valavu yotetezera imatsekedwa.
Maboiler okhala ndi mpweya wotentha kwambiri kuposa 0.5t/h kapena mphamvu yotentha yopitilira kapena yofanana ndi 350kW azikhala ndi mavavu awiri otetezera; ma boiler okhala ndi mpweya wochepera 0.5t/h kapena mphamvu yotentha yochepera 350kW azikhala ndi valavu imodzi yotetezera. Mavavu ndi ma valve otetezera ayenera kusanjidwa nthawi zonse ndipo ayenera kusindikizidwa pambuyo pokonza.