Ngokuhlalutya umgaqo wolwakhiwo lwevalvu yebhola yombhobho esisigxina, kwafunyaniswa ukuba umgaqo wokuvala uyafana, kusetyenziswa umgaqo "wesiphumo sepiston", kwaye kuphela ulwakhiwo lokuvala olwahlukileyo.
Ivalvu ekusetyenzisweni kwengxaki ibonakaliswa kakhulu ngamanqanaba ahlukeneyo, iindlela ezahlukeneyo zokuvuza, ngokomgaqo wolwakhiwo lokutywina kunye nofakelo kunye nohlalutyo lomgangatho wolwakhiwo, izizathu zokuvuza kwevalvu zezi zinto zilandelayo.
1. Ukufakwa kwevalvu kunye nomgangatho wolwakhiwo yeyona nto iphambili
Kwindawo yokufakela, ulwakhiwo alunaki umphezulu wokutywina ivalvu kunye nokukhuselwa kweringi yesihlalo, umonakalo womphezulu wokutywina; ukufakelwa kugqityiwe, ukuvuthuzwa kombhobho kunye nevalvu akukagqitywa, akucocekanga, xa kusebenza kukho i-welding slag okanye igrabile enamathele phakathi kwebhola kunye neringi yesihlalo sokutywina, okubangela ukungaphumeleli kokutywina. Kwimeko enjalo, kwimeko engxamisekileyo, umphezulu wokutywina ongasentla kufuneka ufakwe okwethutyana isixa esifanelekileyo se-sealant ukunciphisa ukuvuza, kodwa akunakuyisombulula ngokupheleleyo ingxaki, ukuba kuyimfuneko, umphezulu wokutywina ivalvu kunye neringi yesihlalo sokutywina kufuneka itshintshwe.
2. Ukucutshungulwa kwevalvu ngoomatshini, izinto zokuvala indandatho, kunye nezizathu zomgangatho wokuhlanganisa
Nangona isakhiwo sevalvu silula, siyimfuneko enkulu yeemveliso ezisemgangathweni zokucubungula oomatshini, umgangatho waso wokucubungula uchaphazela ngokuthe ngqo ukusebenza kokutywina. I-Seal seat ring kunye ne-ring seat assembly clearance kunye nendawo nganye yomphezulu weringi kufuneka ibalwe ngokuchanekileyo, uburhabaxa bomphezulu bufaneleke. Ukongeza, ukukhethwa kwezinto zokutywina ezithambileyo kubaluleke kakhulu, kungekuphela nje ekuqwalaseleni ukugqwala kunye nokumelana nokuguguleka kodwa nasekuqwalaseleni ukuthamba kwayo kunye nokuqina kwayo. Ukuba ithambile kakhulu, iya kuchaphazela amandla okuzicoca; ukuba inzima kakhulu, kuya kuba lula ukuyiqhekeza.
3. Ukukhetha okufanelekileyo ngokwesicelo kunye neemeko zokusebenza
Iindlela ezahlukeneyo zokutywina kunye nezakhiwo zokutywina zevalvu kusetyenziswa amaxesha ahlukeneyo, amaxesha ahlukeneyo kuphela ukukhetha ivalvu eyahlukileyo, ukuze kufunyanwe isiphumo esifanelekileyo sokusebenza. Kwimeko yombhobho wegesi waseNtshona-Mpuma, umzekelo, iivalvu zebhola zepayipi ezizinzileyo ezine-bi-directional sealing kufuneka zikhethwe kangangoko kunokwenzeka (ngaphandle kweevalvu zebhola ezijikelezayo ezine-forced sealing, ezibiza kakhulu). Ngale ndlela, ukuba i-upstream seal yonakele, i-downstream seal isasebenza. I-forced seal ball valve kufuneka ikhethwe ukuba kufuneka ukuthembeka okupheleleyo.
4. Kwiivalvu ezineendlela ezahlukeneyo zokutywina, kufuneka kusetyenziswe iindlela ezahlukeneyo zokusebenza, ukugcinwa, kunye nokulungiswa
Kwiivalvu ezingenazo ii-clump, ivalvu inokuzaliswa ngamafutha ngaphambi nasemva komsebenzi ngamnye okanye rhoqo emva kweenyanga ezi-6 ngobuninzi obuncinci kwiindawo zokujova i-stem kunye ne-sealant, kwaye kuphela kwiimeko apho ukuvuza kwenzeke okanye kungenakuvalwa ngokupheleleyo apho inani elifanelekileyo le-sealant lifakwa khona. Ngenxa ye-viscosity ephezulu ye-sealant, ukuba ivalvu ayizaliswanga nge-sealant rhoqo, iya kuchaphazela isiphumo sokuzicoca somphezulu ojikelezayo, odla ngokubangela ukungavisisani, nto leyo ebangela ukuba kubekho uthuli oluncinci kunye nolunye uthuli phakathi kwe-seal ukuze kubangele ukuvuza. Kwiivalvu ezine-seal eneendlela ezimbini, ukuba iimeko zokhuseleko lwendawo ziyavuma, uxinzelelo olukwi-valve cavity kufuneka lukhululwe luye kwi-zero, ukuqinisekisa ukutywinwa.
Ixesha lokuthumela: Februwari-23-2023