Kukambirana kwa chidziwitso cha valavu ya butterfly

Mu 30s, avalavu ya butterflyidapangidwa ku United States, idayambitsidwa ku Japan m'zaka za m'ma 50, ndipo idagwiritsidwa ntchito kwambiri ku Japan m'zaka za m'ma 60, ndipo idalimbikitsidwa ku China pambuyo pa 70s. Pakalipano, mavavu agulugufe pamwamba pa DN300 mm padziko lapansi pang'onopang'ono alowa m'malo mwa mavavu a zipata. Poyerekeza ndima valve pachipata, ma valve a butterfly ali ndi nthawi yochepa yotsegula ndi kutseka, torque yaing'ono yogwiritsira ntchito, malo ang'onoang'ono oyika ndi kulemera kwake. Kutenga DN1000 mwachitsanzo, valavu ya butterfly ili pafupi ndi 2T, ndipo valve ya chipata ili pafupi ndi 3.5T, ndipo valavu ya butterfly ndi yosavuta kuphatikiza ndi zipangizo zosiyanasiyana zoyendetsa galimoto, ndi kukhazikika bwino komanso kudalirika.

Kuipa kwa chisindikizo cha rabaravalavu ya butterflyndikuti ikagwiritsidwa ntchito pogwedeza, cavitation idzachitika chifukwa chogwiritsa ntchito molakwika, zomwe zidzachititsa kuti mpando wa rabara uwonongeke ndikuwonongeka. M'zaka zaposachedwa, China yapanganso mavavu agulugufe omata zitsulo, ndipo m'zaka zaposachedwa, Japan yapanganso mavavu agulugufe ooneka ngati chisa okhala ndi kukana kwa cavitation, kugwedera kochepa komanso phokoso lochepa.

Moyo wautumiki wa mpando wosindikizira wamba ndi zaka 15-20 za mphira ndi zaka 80-90 zachitsulo pansi pazikhalidwe. Komabe, momwe mungasankhire molondola zimadalira zofunikira pamikhalidwe yogwirira ntchito.

Mgwirizano pakati pa kutsegulidwa kwa avalavu ya butterflyndipo kuthamanga kwake kumakhala kofanana komanso kofanana. Ngati imagwiritsidwa ntchito poyang'anira kuchuluka kwa kayendedwe kake, mawonekedwe ake othamanga amakhalanso ogwirizana kwambiri ndi kukana kwa payipi, monga m'mimba mwake ndi mawonekedwe a ma valve omwe amaikidwa mu mapaipi awiri ndi ofanana, ndipo kutayika kwa payipi kumakhala kosiyana, ndipo kuthamanga kwa valve kudzakhala kosiyana kwambiri.

Ngati valavu ili pamtunda waukulu, kumbuyo kwa mbale ya valve kumakhala kovuta ku cavitation, ndipo pali kuthekera kowononga valavu, choncho imagwiritsidwa ntchito kunja kwa 15 °.

Pamene gulugufe valavu ali pakati kutsegula, kutsegula mawonekedwe opangidwa ndivalavuthupi ndi kutsogolo kutsogolo kwa gulugufe mbale ndi lolunjika pa tsinde valavu, ndi mbali ziwiri kupanga mayiko osiyana, kutsogolo mapeto a gulugufe mbale mbali imodzi amayenda motsatira malangizo a madzi oyenda, ndi mbali inayo kusuntha motsutsa malangizo a madzi oyenderera, kotero, valavu thupi mbali imodzi ndi valavu mbale kupanga nozzle woboola pakati kutsegula, ndi mbali inayo ndi ofanana ndi mphuno-wobowola mofulumira kuposa mphuno ya mphuno, ndipo mbali inayo ndi yofanana ndi mphuno yothamanga kwambiri. mbali, ndipo kupanikizika koipa kudzapangidwa pansi pa valavu ya mbali ya throttle, ndipo chisindikizo cha rabara nthawi zambiri chimagwa.

The makokedwe ntchito ya valavu gulugufe, chifukwa osiyana kutsegula ndi kutsegula malangizo valavu, mtengo wake ndi wosiyana, ndi yopingasa gulugufe valavu, makamaka lalikulu-m'mimba mwake valavu, chifukwa cha kuya kwa madzi, makokedwe kwaiye kusiyana chapamwamba ndi m'munsi mutu wa valavu shaft sangathe kunyalanyazidwa. Kuonjezera apo, pamene chigongono chimayikidwa pambali ya valve yolowera, kutuluka kwapakati kumapangidwa, ndipo torque imawonjezeka. Valavu ikakhala pakatikati potsegulira, njira yogwirira ntchito iyenera kudzitsekera yokha chifukwa chakuchita kwa torque yamadzi.