Ngokuhlalutya kunye nophando malunga nomgaqo wesakhiwo sombhobho osisigxinaivalve yebhola, kufumaniseka ukuba umgaqo wokutywina uyafana, kwaye umgaqo we 'piston effect' uyasetyenziswa, kodwa isakhiwo sokutywina sahlukile.
Iingxaki ezikhoyo ekusetyenzisweni kweevalve zibonakaliswa ikakhulu kwiidigri ezahlukeneyo kunye neendlela ezahlukeneyo zokuvuza.Ngokomgaqo wesakhiwo sokutywinwa kunye nohlalutyo lofakelo kunye nomgangatho wokwakha, izizathu zokuvuza kwevalve zimi ngolu hlobo lulandelayo.
(1) Umgangatho wokwakhiwa kofakelo lwevalve sesona sizathu siphambili.
Ekufakeni kunye nokwakhiwa, ukukhuselwa kwendawo yokutywinwa kwe-valve kunye nokutywinwa kwesitulo sokutywina akuhoywa ngqalelo, kwaye indawo yokutywina yonakaliswe.Emva kokuba kugqitywe ukufakela, umbhobho kunye negumbi levalvu azicocwa ngokucokisekileyo nangokucocekileyo.Kumsebenzi, i-welding slag okanye igrabile ibambeke phakathi kwesphere kunye nomsesane wesitulo sokutywina, okukhokelela ekungaphumeleli kokutywinwa.Kule meko, isixa esifanelekileyo se-sealant kufuneka sifakwe okwethutyana kwindawo yokutywina ephezulu kwimeko engxamisekileyo ukunciphisa ukuvuza, kodwa ingxaki ayinakusonjululwa ngokupheleleyo.Ukuba kuyimfuneko, indawo yokuvala ivalve kunye neringi yesitulo sokutywina kufuneka itshintshwe.
(2) Umatshini weValve, izinto zokutywina kunye nezizathu zomgangatho wendibano
Nangona ulwakhiwo lwevalve lulula, luyimveliso efuna umgangatho ophezulu womatshini, kwaye umgangatho wayo womatshini uchaphazela ngokuthe ngqo ukusebenza kokutywinwa.Ukukhutshwa kwendibano kunye nommandla ngamnye we-torus weringi yokutywina kunye nesihlalo se-ring kufuneka kubalwe ngokuchanekileyo, kunye noburhabaxa bomphezulu kufuneka bufaneleke.Ukongeza, ukukhethwa kwezinto ezithambileyo zokutywina kukwabaluleke kakhulu, kungekuphela nje ukuqwalasela ukumelana nokubola kunye nokumelana nokunxiba, kodwa nokuqwalasela ukuqina nokuqina kwayo.Ukuba ithambile kakhulu iya kuchaphazela isakhono sokuzicoca, kunzima kakhulu ukuqhekeza.
(3) Ukhetho olufanelekileyo ngokwesicelo kunye neemeko zokusebenza
Iivalvukunye nokusebenza kokutywinwa okuhlukeneyo kunye nesakhiwo sokutywina sisetyenziswa kwiimeko ezahlukeneyo.Kuphela ngokukhetha iivalve ezahlukeneyo kwiimeko ezahlukeneyo kunokufumaneka umphumo ofanelekileyo wokusetyenziswa.Ukuthatha i-West-East Gas Pipeline njengomzekelo, ivalve yebhola yombhobho esisigxina enomsebenzi wokutywina weendlela ezimbini kufuneka ikhethwe kangangoko kunokwenzeka ( ngaphandle kwevalve yebhola yomzila etywinwe ngokunyanzeliswa, kuba ibiza kakhulu ).Ngaloo ndlela, lakuba itywina elingasentla lonakaliswe, itywina elisezantsi lisenokusebenza.Ukuba kufuneka ukuthembeka ngokupheleleyo, ivalve yebhola yomkhondo enetywina elinyanzelweyo kufuneka ikhethwe.
(4)Iivalvu ezinezakhiwo zokutywina ezahlukeneyo kufuneka zisetyenziswe, zigcinwe kwaye zinikezelwe ngenkonzo ngeendlela ezahlukeneyo
Kubaiivalvengaphandle kokuvuza, inani elincinci legrisi linokongezwa kwi-valve stem kunye ne-sealant injection port ngaphambi nangemva komsebenzi ngamnye okanye kwiinyanga ezi-6.Kuphela xa ukuvuza kwenzeke okanye kungenakutywinwa ngokupheleleyo, isixa esifanelekileyo se-sealant sinokutofwa.Ngenxa yokuba i-viscosity ye-sealant inkulu kakhulu, ukuba i-sealant yongezwa kwi-valve engavuziyo, iya kuchaphazela umphumo wokuzicoca we-spherical surface, ehlala iphikisana, kunye negrabile encinci kunye nobunye ubumdaka bungeniswa. itywina ukubangela ukuvuza.Kwivalve eneendlela ezimbini zokutywinwa, ukuba iimeko zokhuseleko lwesiza zivuma, uxinzelelo kwigumbi levalve kufuneka lukhululwe lube ku-zero, olunceda ekuqinisekiseni ngcono ukutywinwa.
Ixesha lokuposa: Feb-17-2023