Phakathi kwabasebenzisi abasebenzisa iivalvu zeglobe ezinkulu-ububanzi yonke imihla, badla ngokuxela ingxaki yokuba iivalvu zeglobe ezinkulu-ububanzi zihlala kunzima ukuzivala xa zisetyenziswa kwimidiya enomahluko omkhulu woxinzelelo, njengomphunga, amanzi aphezulu-uxinzelelo, njl. Xa kuvalwa ngamandla, kusoloko kufunyaniswa ukuba kuza kubakho ukuvuza, kwaye kunzima ukuvala ngokuqinileyo. Isizathu sale ngxaki sibangelwa kuyilo lwesakhiwo sevalvu kunye ne-torque enganeleyo yokukhupha i-human limit level.

Uhlalutyo lobunzima bokutshintsha iiValve ezinkulu

Amandla okuvelisa amandla omntu omdala angama-60-90kg, kuxhomekeke kuhlobo lomzimba olwahlukileyo.

Ngokubanzi, indlela yokuhamba kwevalvu yeglobe yenzelwe ukuba ibe sezantsi ngaphakathi nangaphandle. Xa umntu evala ivalvu, umzimba womntu utyhala ivili lesandla ukuze lijikeleze ngokuthe tye, ukuze i-valve flap iye ezantsi ukuze ivalwe. Ngeli xesha, kuyimfuneko ukoyisa indibaniselwano yamandla amathathu, oko kukuthi:

(1) Amandla okutyhala e-Axial Fa;

(2) Amandla okungqubana Fb phakathi kokupakisha kunye nesiqu sevalvu;

(3) Amandla okuxinana koqhagamshelwano phakathi kwesiqu sevalvu kunye nesiseko sediski yevalvu

Isimbuku semizuzu yi ∑M=(Fa+Fb+Fc)R

Kuyabonakala ukuba okukhona ububanzi bukhulu, kokukhona amandla okutyhala axial aphezulu. Xa ikufutshane nemeko evaliweyo, amandla okutyhala axial aphantse asondele kuxinzelelo lokwenyani lwenethiwekhi yepayipi (ngenxa ye-P1-P2≈P1, P2=0)

Umzekelo, ivalvu yeglobhu ye-DN200 caliber isetyenziswa kumbhobho womphunga we-10bar, kuphela yi-axial thrust yokuqala yokuvala i-Fa=10×πr2=3140kg, kwaye amandla ajikelezayo angqindilili afunekayo ukuvala asondele kumandla ajikelezayo angqindilili anokukhutshwa yimizimba yabantu eqhelekileyo. , ngoko ke kunzima kakhulu ukuba umntu omnye ayivale ngokupheleleyo ivalvu phantsi kwale meko.

Kakade ke, eminye imizi-mveliso icebisa ukuba kufakwe iivalvu ezinjalo ngasemva, nto leyo esombulula ingxaki yokuba kunzima ukuzivala, kodwa kukwakho nengxaki yokuba kunzima ukuzivula emva kokuvala.

Uhlalutyo lweZinto ezibangela ukuvuza kwangaphakathi kweeValve zeGlobe ezinkulu

Iivalvu ezinkulu zeglobe zihlala zisetyenziswa kwiindawo zokufaka iibhoyila, kwiisilinda eziphambili, kwiindlela zomphunga nakwezinye iindawo. Ezi ndawo zineengxaki ezilandelayo:
(1) Ngokubanzi, umahluko woxinzelelo kwindawo yokuphuma kwebhoyila mkhulu kakhulu, ngoko ke izinga lokuhamba komphunga nalo likhulu, kwaye umonakalo wokukhukuliseka komphezulu wokutywina nawo mkhulu. Ukongeza, ukusebenza kakuhle kwebhoyila akunakuba yi-100%, nto leyo eya kubangela ukuba umphunga kwindawo yokuphuma kwebhoyila ube nomxholo wamanzi amaninzi, nto leyo eya kubangela ukuba kube lula ukubangela ukuba i-cavitation kunye ne-cavitation kumphezulu wokutywina ivalvu.

(2) Kwivalvu yokumisa kufutshane nendawo yokuphuma kwebhoyila kunye ne-sub-cylinder, kuba umphunga osandul’ ukuphuma kwibhoyila une-superheating phenomenon eqhubekayo, ngexesha lokugcwala kwawo, ukuba unyango lokuthambisa lwamanzi ebhoyila alulunganga kakuhle, inxalenye yamanzi idla ngokugaleleka. Izinto ze-asidi kunye ne-alkali ziya kubangela ukubola kunye nokukhukuliseka kumphezulu wokutywina; ezinye izinto ezikristalikayo zinokunamathela kumphezulu wokutywina wevalvu kwaye zinyibilike, nto leyo ebangela ukuba ivalvu ingakwazi ukuvala kakuhle.

(3) Kwiivalvu zokungena kunye nezokuphuma zeesilinda ezincinci, ukusetyenziswa komphunga emva kwevalvu kukhulu kwaye ngamanye amaxesha kuncinci ngenxa yeemfuno zemveliso kunye nezinye izizathu. Kubangela ukukhukuliseka, ukuqhekeka kwemithambo kunye nokunye ukulimala kumphezulu wokutywina ivalvu.

(4) Ngokubanzi, xa kuvulwa umbhobho omkhulu, umbhobho kufuneka ufudunyezwe, kwaye inkqubo yokufudumeza kwangaphambili ifuna ukuhamba kancinci komphunga ukuze udlule, ukuze umbhobho ufudunyezwe kancinci kwaye ngokulinganayo ukuya kwinqanaba elithile ngaphambi kokuba ivalvu yokumisa ivulwe ngokupheleleyo ukuze kuthintelwe ukubangela umonakalo kumbhobho. Ukufudumeza ngokukhawuleza kubangela ukwanda okugqithisileyo, okonakalisa ezinye iindawo zonxibelelwano. Nangona kunjalo, kule nkqubo, ukuvulwa kwevalvu kudla ngokuba kuncinci kakhulu, okubangela ukuba izinga lokukhukuliseka libe likhulu kakhulu kunesiphumo sokusetyenziswa esiqhelekileyo, kwaye kunciphisa kakhulu ubomi benkonzo yomphezulu wokutywina ivalvu.

Izisombululo zoBunzima bokutshintsha iiValve zeGlobe ezinkulu

(1) Okokuqala, kucetyiswa ukuba ukhethe ivalvu yeglobhu evaliweyo ene-bellows, ethintela impembelelo yokumelana nokungqubana kwevalvu ye-plunger kunye nevalvu yokupakisha, kwaye yenza kube lula ukutshintsha.

(2) Isiseko sevalvu kunye nesihlalo sevalvu kufuneka zenziwe ngezinto ezinokumelana nokukhukuliseka okuhle kunye nokusebenza kakuhle kokuguguleka, njengeStellite carbide;

(3) Kucetyiswa ukuba kusetyenziswe isakhiwo sediski esinevalvu ezimbini, esingayi kubangela ukukhukuliseka okugqithisileyo ngenxa yokuvulwa okuncinci, okuya kuchaphazela ubomi benkonzo kunye nesiphumo sokutywina.