1. Ƙofar Ƙofar: Ƙofar Ƙofar tana nufin valve tare da ɓangaren rufewa (ƙofa) yana motsawa tare da madaidaiciyar madaidaiciyar tashar tashar tashar.An fi amfani da shi azaman matsakaicin yankewa a cikin bututun, wato, cikakke cikakke ko rufewa.Gabaɗaya, bai kamata a yi amfani da bawul ɗin ƙofa ba don daidaita kwarara.Ana iya amfani da shi don ƙananan zafin jiki ko matsanancin zafi da matsa lamba, dangane da kayan bawul.Amma ba a amfani da bawul ɗin ƙofar gabaɗaya don isar da laka da sauran kafofin watsa labarai a cikin bututun.
Amfani:
(1) ƙananan juriya na ruwa;
② Ƙunƙarar da ake buƙata don farawa da rufewa kadan ne;
(3) Za a iya amfani da shi a cikin matsakaicin matsakaici zuwa hanyoyi guda biyu na hanyar sadarwa na zobe, wato, ba a iyakance kwararar matsakaici;
(4) a lokacin da cikakken bude, da sealing surface da aka lalatar da aiki matsakaici ne karami fiye da tasha bawul;
Tsarin siffar yana da sauƙi mai sauƙi, fasaha mai kyau na masana'antu;
Tsawon tsarin yana da ɗan gajeren lokaci.
Rashin hasara:
(1) Girman da tsayin buɗewa yana da girma, wurin shigarwa da ake buƙata kuma babba;
(2) a cikin aiwatar da buɗewa da rufewa, shingen shingen dangi na dangi, asarar gogayya yana da girma, har ma da sauƙin haifar da al'amuran abrasion a babban zafin jiki;
(3) Bawul ɗin ƙofar gaba ɗaya yana da saman rufewa guda biyu, zuwa aiki, niƙa da kiyayewa ya ƙaru wasu matsaloli;
④ Dogon buɗewa da lokacin rufewa.

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