Ingxoxo yolwazi lwevalvu yebhabhathane

Nge 30s, iivelufa butterflyyaqanjwa e-United States, yaziswa eJapan ngeminyaka yama-50s, kwaye yayisetyenziswa kakhulu eJapan ngeminyaka yama-60s, kwaye yakhuthazwa e-China emva kweminyaka yama-70s. Okwangoku, iivalve zebhabhathane ngaphezulu kwe-DN300 mm emhlabeni ziye zatshintsha ngokuthe ngcembe iivalvu zesango. Xa kuthelekiswa neiivalve zesango, iivalve zebhabhathane zinexesha elifutshane lokuvula kunye nokuvala, i-torque encinci yokusebenza, indawo encinci yokufakela kunye nobunzima obulula. Ukuthatha i-DN1000 njengomzekelo, i-valve ye-butterfly malunga ne-2T, kwaye i-valve yesango malunga ne-3.5T, kwaye i-valve butterfly ilula ukudibanisa kunye nezixhobo ezahlukeneyo zokuqhuba, ngokuhlala kakuhle kunye nokuthembeka.

Ukungalungi kwetywina lerabhaivelufa butterflykukuba xa isetyenziselwa i-throttling, i-cavitation iya kwenzeka ngenxa yokusetyenziswa okungafanelekanga, okuya kubangela ukuba isihlalo se-rubber sihlambuluke kwaye sonakaliswe. Kwiminyaka yakutshanje, i-China iye yavelisa iivalve zebhabhathane ezitywiniweyo, kwaye kwiminyaka yakutshanje, iJapan iye yavelisa iivalve zebhabhathane ezimilise okwekama ezinokumelana ne-cavitation, ukungcangcazela okuphantsi kunye nengxolo ephantsi.

Ubomi benkonzo yesihlalo sokutywinwa ngokubanzi yiminyaka eyi-15-20 yerabha kunye ne-80-90 iminyaka yesinyithi phantsi kweemeko eziqhelekileyo. Nangona kunjalo, indlela yokukhetha ngokuchanekileyo kuxhomekeke kwiimfuno zeemeko zokusebenza.

Ubudlelwane phakathi kokuvulwa kwe-aivelufa butterflykwaye isantya sokuhamba ngokusisiseko singumgca kwaye siyalingana. Ukuba isetyenziselwa ukulawula izinga lokuhamba, iimpawu zayo zokuhamba nazo zihambelana ngokusondeleyo nokuxhatshazwa kokuhamba kombhobho, njengobubanzi kunye nefom yeevalvu ezifakwe kwimibhobho emibini efanayo, kwaye i-coefficient yokulahlekelwa kwepayipi iyahluka. , kwaye izinga lokuhamba kwevalve liya kuba lihluke kakhulu.

Ukuba i-valve ikwimeko ye-throttling enkulu, umva weplate ye-valve ixhomekeke kwi-cavitation, kwaye kukho ukonakalisa i-valve, ngoko ke isetyenziswe ngokubanzi ngaphandle kwe-15 °.

Xa ivelufa butterfly kuvula phakathi, imilo yokuvula eyenziwe yiivalveumzimba kunye nesiphelo sangaphambili sepleyiti yebhabhathane ibekwe embindini wevalve shaft, kwaye amacala amabini enza amazwe ahlukeneyo, isiphelo sangaphambili sepleyiti yebhabhathane kwelinye icala ihamba kwicala lamanzi aqukuqelayo, kwaye elinye icala liya kwicala amanzi aqukuqelayo, ngoko ke, umzimba wevalvu kwelinye icala kunye nepleyiti yevalve yenza imbobo emile okwe-nozzle, kwaye elinye icala lifana nokuvuleka okumise okwe-throttle, icala lombhobho likhawuleza kakhulu kunecala le-throttle, kwaye Uxinzelelo olubi luya kwenziwa phantsi kwevalve yecala le-throttle, kwaye isitywina serabha sihlala sisiwa.

I-torque yokusebenza yevalve yebhabhathane, ngenxa yendlela eyahlukileyo yokuvula kunye nokuvula indlela yevalve, ixabiso layo lahlukile, kunye nevalve yebhabhathane ethe tyaba, ngakumbi ivalve yobubanzi obukhulu, ngenxa yobunzulu bamanzi, itorque eyenziwe ngumahluko phakathi. intloko ephezulu kunye nesezantsi ye-valve shaft ayinakuhoywa. Ukongezelela, xa i-elbow ifakwe kwi-inlet side ye-valve, ukuhamba kwe-deflection kuyenziwa, kwaye i-torque iyanda. Xa i-valve iphakathi kokuvula, indlela yokusebenza kufuneka izivalele ngenxa yesenzo se-torque yamanzi.