Ukubonakala kwevalve yebhola kwakusemva kweMfazwe yesibini yeHlabathi.Nangona ukuveliswa kwevalve yebhola kuqale ekuqaleni kwenkulungwane yama-20, le patent yolwakhiwo ayiphumelelanga ukugqiba amanyathelo ayo orhwebo ngenxa yothintelo kushishino lwemathiriyeli kunye neshishini lokulungisa oomatshini.IDuPont eUnited States yavelisa iplastiki yepolymer ephezulu yepolytetrafluoroethylene (PTFE) de kwangowe-1943. Olu hlobo lwemathiriyeli luneenzuzo zokuqina okwaneleyo kunye namandla acinezelayo, i-elastoplasticity ethile, iipropati ezilungileyo zokuzithambisa kunye nokumelana nokugqwesa okugqwesileyo, okufanelekileyo kakhulu njenge izinto zokutywina kwaye zinefuthe elithembekileyo lokutywina.Ukongezelela, ibhola elinomjikelezo ophezulu kunye nokugqiba kakuhle kwendawo inokuveliswa njengelungu lokuvala i-valve yebhola ngenxa yokuphuhliswa kwemishini yokugaya ibhola.Uhlobo olutsha lwevalve ene-bore epheleleyo kunye ne-90 ° uhambo olujikelezayo olujikelezayo lungena kwimarike yevalve, itsala ingqalelo enkulu.Iimveliso zevalve zemveli ezifana neevalvu zokumisa, iivalve zesango, iivalve zeplagi kunye neevalve zebhabhathane ngokuthe ngcembe zithatyathelw' indawo ziivalvu zebhola, kwaye iivalvu zebhola zisetyenziswa kakhulu, ukusuka kwiidamitha ezincinci ukuya kwiidamitha ezinkulu, uxinzelelo oluphantsi ukuya kuxinzelelo oluphezulu, ubushushu obuqhelekileyo ukuya kubushushu obuphezulu, ubushushu obuphezulu ukuya kwiqondo eliphantsi.Okwangoku, ubuninzi bobubanzi be-valve yebhola bufikelele kwi-Intshi ye-60, kwaye ubushushu obuphantsi bunokufikelela kwiqondo lokushisa le-hydrogen yamanzi -254 ℃.Iqondo lokushisa eliphezulu linokufikelela kwi-850 ukuya kwi-900 ℃.Zonke ezi zenza iivalve zebhola ezifanelekileyo kuzo zonke iintlobo zemidiya, eziye zibe lolona hlobo luthembisayo lwevalve.

Iivalve zebhola zinokwahlulwa zibe ziivalve zebhola ezidadayo kunye neevalvu zebhola zetrunnion ngokusekelwe kwisakhiwo.

Iivalvu zebhola zinokuhlelwa ngokweevalvu zebhola yokungena ephezulu kunye neevalvu zebhola yokungena esecaleni.Iivalve zebhola ezisecaleni zinokwahlulwa zibe yivalve yesiqwenga esinye, iivalve zebhola eziqhekeza-mbini kunye neevalve zebhola ezinamaqhekeza amathathu ngokwesakhiwo somzimba wevalvu.Imizimba yevalvu yebhola enye ibalulekile;iivalve zebhola ezinamaqhekeza amabini ziqulathe imizimba yevalvu engundoqo kunye nemizimba yevalvu encedisayo kunye neevalve zebhola ezinamaqhekeza amathathu zenziwe ngumzimba wevalve engundoqo kunye namaqumrhu amabini ancedisayo.

Iivalvu zebhola zinokuhlelwa ngokweevalve zebhola ezithambileyo zokutywina kunye neevalvu zebhola eziqinileyo zokutywina ngokwesixhobo sokutywina.Izinto zokutywina zeevalvu zebhola ezithambileyo zokutywina zizinto zepolymer eziphezulu ezifana ne-polytetrafluoroethylene (PTFE), i-polytetrafluoroethylene eyomeleziweyo kunye nenayiloni kunye nerabha.Izinto zokutywina zeevalvu zebhola eziqinileyo ziziintsimbi.