Imbonakalo yevalvu yebhola yayisemva kweMfazwe Yehlabathi yesiBini. Nangona ukuveliswa kwevalvu yebhola kuqale ekuqaleni kwenkulungwane yama-20, le patent yolwakhiwo ayizange igqibe amanyathelo ayo okuthengisa ngenxa yemida kwishishini lezinto kunye nomzi-mveliso wokucubungula oomatshini. I-DuPont e-United States yasungula iplastiki ye-polytetrafluoroethylene (PTFE) ephezulu yepolymer material de kwaba ngu-1943. Olu hlobo lwezinto luneengenelo zokuqina okwaneleyo kunye namandla okucinezela, i-elastoplasticity ethile, iipropati ezilungileyo zokuzithambisa kunye nokumelana nokugqwala okuhle, okufanelekileyo kakhulu njengezinto zokutywina kwaye kunempembelelo ethembekileyo kakhulu yokutywina. Ukongeza, ibhola ejikelezileyo ephezulu kunye nokugqitywa okuhle komphezulu inokwenziwa njengelungu lokuvala levalvu yebhola ngenxa yophuhliso loomatshini bokugaya ibhola. Uhlobo olutsha lwevalvu ene-bore epheleleyo kunye nokuhamba kwe-90° ejikelezayo lungena kwimarike yevalvu, lutsala ingqalelo enkulu. Iimveliso zeevalvu zemveli ezifana neevalvu zokumisa, iivalvu zesango, iivalvu zeplagi kunye neevalvu zebhabhathane zitshintshwa kancinci kancinci ziivalvu zebhola, kwaye iivalvu zebhola zisetyenziswa kakhulu, ukusuka kwiidayamitha ezincinci ukuya kwiidayamitha ezinkulu, uxinzelelo oluphantsi ukuya kuxinzelelo oluphezulu, ubushushu obuqhelekileyo ukuya kubushushu obuphezulu, ubushushu obuphezulu ukuya kubushushu obuphantsi. Okwangoku, ububanzi obukhulu bevalvu yebhola bufikelele kwi-intshi ezingama-60, kwaye ubushushu obuphantsi bunokufikelela kubushushu behydrogen engamanzi -254℃. Ubushushu obuphezulu bunokufikelela kwi-850 ukuya kwi-900℃. Zonke ezi zinto zenza iivalvu zebhola zifaneleke kuzo zonke iintlobo zemidiya, eziba lolona hlobo lwevalvu luthembisayo.

Iivalvu zebhola zinokwahlulwa zibe ziivalvu zebhola ezidadayo kunye neevalvu zebhola zetrunnion ngokusekelwe kwisakhiwo.

Iivalvu zebhola zinokwahlulwa zibe ziivalvu zebhola zokungena eziphezulu kunye neevalvu zebhola zokungena ecaleni. Iivalvu zebhola zokungena ecaleni zinokwahlulwa zibe ziivalvu zebhola zeqhekeza elinye, iivalvu zebhola zeqhekeza ezimbini kunye neevalvu zebhola zeqhekeza ezintathu ngokwesakhiwo somzimba wevalvu. Imizimba yeevalvu zebhola zeqhekeza elinye iyinxalenye; iivalvu zebhola zeqhekeza ezimbini zenziwe ziibhodi zevalvu eziphambili kunye neebhodi zevalvu ezincedisayo kwaye iivalvu zebhola zeqhekeza ezintathu zenziwe ngumzimba wevalvu oyintloko omnye kunye neebhodi zevalvu ezimbini ezincedisayo.

Iivalvu zebhola zinokwahlulwa zibe ziivalvu zebhola ezitywinayo ezithambileyo kunye neevalvu zebhola ezitywinayo eziqinileyo ngokwezinto zokutywinayo zeevalvu. Izinto zokutywinayo zeevalvu zebhola ezitywinayo ezithambileyo zizinto eziphezulu zepolymer ezifana ne-polytetrafluoroethylene (PTFE), i-polytetrafluoroethylene eqinisiweyo kunye ne-nylon kunye nerabha. Izinto zokutywinayo zeevalvu zebhola ezitywinayo eziqinileyo zisinyithi.