Ingxoxo yolwazi ngevalvu yebhabhathane

Kwiminyaka yoo-1930,ivalvu yebhabhathaneYasungulwa eMelika, yaziswa eJapan ngeminyaka yoo-1950, yaza yasetyenziswa kakhulu eJapan ngeminyaka yoo-1960, yaza yakhuthazwa eTshayina emva kweminyaka yoo-1970. Okwangoku, iivalvu zebhabhathane ezingaphezulu kwe-DN300 mm emhlabeni ziye zatshintsha iivalvu zesango kancinci kancinci. Xa kuthelekiswaiivalvu zesango, iivalvu zebhabhathane zinexesha elifutshane lokuvula nokuvala, i-torque encinci yokusebenza, indawo encinci yokufaka kunye nobunzima obulula. Umzekelo, ivalvu yebhabhathane imalunga ne-2T, kwaye ivalvu yesango imalunga ne-3.5T, kwaye ivalvu yebhabhathane kulula ukuyidibanisa nezixhobo ezahlukeneyo zokuqhuba, inokuqina okuhle kunye nokuthembeka.

Ububi bophawu lwerabhaivalvu yebhabhathanekukuba xa isetyenziselwa ukuqhobosha, ukugquma kwesisu kuya kwenzeka ngenxa yokusetyenziswa ngendlela engafanelekanga, nto leyo eya kubangela ukuba isihlalo serabha siqhekeke size sonakale. Kwiminyaka yakutshanje, iTshayina ikwaphuhlisile iivalvu zebhabhathane ezitywiniweyo ngentsimbi, kwaye kwiminyaka yakutshanje, iJapan iphuhlisile iivalvu zebhabhathane ezimile okwekhombhini ezinokumelana nokugquma kwesisu, ukungcangcazela okuphantsi kunye nengxolo ephantsi.

Ubomi benkonzo yesihlalo sokutywina ngokubanzi yiminyaka eli-15-20 kwirabha kunye neminyaka engama-80-90 kwisinyithi phantsi kweemeko eziqhelekileyo. Nangona kunjalo, indlela yokukhetha ngokuchanekileyo ixhomekeke kwiimfuno zeemeko zokusebenza.

Ubudlelwane phakathi kokuvulwa kweivalvu yebhabhathanekwaye isantya sokuhamba kwamanzi ngokusisiseko sihamba ngomgca kwaye silingana. Ukuba isetyenziselwa ukulawula isantya sokuhamba kwamanzi, iimpawu zayo zokuhamba kwamanzi zikwanxulumene ngokusondeleyo nokumelana nokuhamba kwamanzi emibhobhoni, njengokuba ububanzi kunye nohlobo lweevalvu ezifakwe kwimibhobho emibini ziyafana, kwaye i-coefficient yokulahleka kwepayipi yahlukile, kwaye isantya sokuhamba kwamanzi sevalvu siya kwahluka kakhulu.

Ukuba ivalvu ikwimeko yokuxinana okukhulu, umva wepleyiti yevalvu unokuba ne-cavitation, kwaye kukho ithuba lokonakalisa ivalvu, ngoko ke isetyenziswa ngokubanzi ngaphandle kwe-15°.

Xa ivalvu yebhabhathane ikwindawo ephakathi, imo yokuvula yenziwe yiivalvuUmzimba kunye nesiphelo esingaphambili sepleyiti yebhabhathane ziphakathi kwi-valve shaft, kwaye amacala amabini enza iimeko ezahlukeneyo, isiphelo esingaphambili sepleyiti yebhabhathane kwelinye icala sihamba kwicala lamanzi aqukuqelayo, kwaye elinye icala lihamba ngokuchasene necala lamanzi aqukuqelayo, ngoko ke, umzimba wevalvu kwelinye icala kunye nepleyiti yevalvu zenza ukuvulwa okufana nomlomo, kwaye elinye icala lifana nokuvulwa okufana nomngxuma we-throttle, icala le-nozzle likhawuleza kakhulu kunecala le-throttle, kwaye uxinzelelo olubi luya kuveliswa phantsi kwevalvu esecaleni le-throttle, kwaye isitywino serabha sihlala siwa.

I-torque yokusebenza ye-butterfly valve, ngenxa yokuvula nokuvula okwahlukileyo kwe-valve, ixabiso layo lahlukile, kwaye i-valve ye-butterfly ethe tye, ingakumbi i-valve enobubanzi obukhulu, ngenxa yobunzulu bamanzi, i-torque eveliswa ngumahluko phakathi kwentloko ephezulu nesezantsi ye-valve shaft ayinakutyeshelwa. Ukongeza, xa kufakwa ingqiniba kwicala lokungena le-valve, kwakheka ukuhamba kokuphambuka, kwaye i-torque iyanda. Xa i-valve ikwindawo ephakathi yokuvula, indlela yokusebenza kufuneka izivale ngokwayo ngenxa yesenzo se-torque yokuhamba kwamanzi.