Xa kuhlolwa iinkqubo ezintsha zemibhobho, imibhobho kunye neevalvu ziphantsi kovavanyo lokuqala: iimvavanyo ezimbini zokuvuza, uvavanyo olulodwa lwe-150% lwe-hydrostatic kunye novavanyo olunye lwe-N2He (i-nitrogen, i-helium).Olu vavanyo alugqumi kuphela iiflange ezidibanisa ivalve kunye nemibhobho, kodwa kunye nebhonethi kunye nevalve yojongano lomzimba, kunye nawo onke amalungu eplagi/spool kumzimba wevalvu.

Ukuqinisekisa ukuba i-cavity ngaphakathi kwesango elihambelanayo okanye i-valve yebhola igxininiswe ngokwaneleyo ngexesha lokuvavanya, i-valve kufuneka ibe kwindawo evulekileyo ye-50%, njengoko kuboniswe kuMfanekiso 1. Ukuza kuthi ga ngoku yonke into ibonakala isebenza kakuhle, kodwa ngaba kunokwenzeka ngokwenene yenza oku kweyona glowubhu isetyenziswa ngokuxhaphakileyo kunye neevalvu zesango le wedge?Ukuba zombini iivalvu zikwindawo evuleke ngesiqingatha njengoko kubonisiwe kuMfanekiso 2, uxinzelelo olusemngxunyeni luya kusebenza ekupakishweni kweshaft yevalve.Ukupakishwa kwe-spindle kudla ngokuba yi-graphite material.Kwi-150% yoxinzelelo loyilo, xa kuvavanywa ngeegesi ezincinci ze-molecular ezifana ne-helium, ngokuqhelekileyo kuyimfuneko ukuqinisa i-bolts ye-valve yokuvala i-bolts ukuze ufumane iziphumo eziqhelekileyo zovavanyo.

Ingxaki ngalo msebenzi, nangona kunjalo, iyakwazi ukuxinzelela ukupakisha, okubangelwa ukwanda koxinzelelo olufunekayo ekusebenzeni i-valve.Njengoko i-friction isanda, ngokunjalo neqondo lokuguga kokusebenza ekupakisheni.

Ukuba indawo yevalve ayikho kwisitulo sokutywina esingasentla, kukho ukuthambekela kokunyanzela ishafu yevalve ukuba ityeke xa uqinisa ibhonethi yoxinzelelo.Ukuthambeka kweshafu yevalvu kunokubangela ukuba ikrwele isigqubuthelo sevalvu ngexesha lokusebenza kwaye kubangele amanqaku okukrwela.

Ukuba ukuphathwa kakubi ngexesha lovavanyo lwangaphambili kubangela ukuvuza kwi-shaft packing, kuyinto eqhelekileyo ukuqinisa ngakumbi ibhonethi yoxinzelelo.Ukwenza oko kunokubangela umonakalo omkhulu kwisivalo sevalve yoxinzelelo kunye/okanye iibholiti zamadlala.Umzobo we-4 ngumzekelo wemeko apho i-torque egqithisileyo isetyenziswe kwi-gland nut / bolt, ebangela ukuba i-valve yoxinzelelo igubungele kwaye iguqule.Uxinzelelo olugqithisileyo kwibhonethi yoxinzelelo lunokubangela ukuba iibholithi zebhonethi ziqhawule.

I-nut yesivalo sevalve yoxinzelelo iyakhululwa ukukhulula uxinzelelo kwi-valve shaft packing.Uvavanyo lwangaphambili kule meko lunokuxelela ukuba kukho ingxaki ngesiqu kunye / okanye isitywina sebhonethi.Ukuba ukusebenza kwesitulo sotywino esingasentla kubi, cinga ngokutshintsha ivalve.Ukuqukumbela, isihlalo sotywino esiphezulu kufuneka sibe sitywina esiqinisekisiweyo sentsimbi ukuya kwintsimbi.

Emva kokuvavanywa kokuqala, kuyimfuneko ukusebenzisa uxinzelelo olufanelekileyo kwi-stem packing ngelixa uqinisekisa ukuba ukupakishwa akugxininisi kwi-stem.Ngale ndlela, ukugqithisa ngokugqithiseleyo kwe-valve stem kunokuphetshwa, kwaye ubomi obuqhelekileyo benkonzo yokupakisha bunokugcinwa.Kukho iingongoma ezimbini ezifanele ukuqwalaselwa: Okokuqala, ukupakishwa kwegraphite ecinezelweyo akuyi kubuyela kurhulumente ngaphambi kokunyanzeliswa nokuba uxinzelelo lwangaphandle lukhululiwe, ngoko ukuvuza kuya kwenzeka emva kokukhulula uxinzelelo loxinzelelo.Okwesibini, xa uqinisa ukupakishwa kwe-stem, qiniseka ukuba indawo yevalve ikwindawo yesihlalo sokutywina esiphezulu.Kungenjalo, ukunyanzeliswa kokupakishwa kwegraphite kunokungalingani, kubangele isiqu sevalve sibe notyekelo lokuthambeka, nto leyo ebangela ukuba umphezulu wesiqu sevalvu ukrwelwe, kwaye isikhondo sevalve sipakishe ukuvuza ngokunzulu, kwaye ivalve enjalo kufuneka ukutshintshwa.