Ukuvela kwevalvu yebhola kwakungemva kweMpi Yezwe Yesibili. Nakuba ukusungulwa kwevalvu yebhola kwaqala ekuqaleni kwekhulu lama-20, leli patent lesakhiwo lehlulekile ukuqeda izinyathelo zalo zokuhweba ngenxa yemikhawulo embonini yezinto zokwakha kanye nemboni yokucubungula imishini. I-DuPont e-United States yasungula ipulasitiki ye-polytetrafluoroethylene (PTFE) ephezulu ye-polymer kwaze kwaba ngu-1943. Lolu hlobo lwezinto lunezinzuzo zamandla anele okucindezelwa nokucindezela, i-elastoplasticity ethile, izakhiwo ezinhle zokuzigcoba kanye nokumelana okuhle kokugqwala, okulungele kakhulu njengento yokuvala futhi kunomphumela wokuvala othembekile kakhulu. Ngaphezu kwalokho, ibhola elinokujikeleza okuphezulu kanye nokuphela okuhle kobuso lingenziwa njengelungu lokuvala levalvu yebhola ngenxa yokuthuthukiswa kwemishini yokugaya ibhola. Uhlobo olusha lwevalvu olunembobo egcwele kanye nokuhamba kwe-angle engu-90° kujikeleza lungena emakethe yamavalvu, ludonsela ukunaka okukhulu. Imikhiqizo yamavalvu yendabuko efana namavalvu okumisa, amavalvu esango, amavalvu epulagi kanye namavalvu ebhabhathane ashintshwa kancane kancane ngamavalvu ebhola, futhi amavalvu ebhola asetshenziswa kakhulu, kusukela kumadayamitha amancane kuya kumadayamitha amakhulu, ukucindezela okuphansi kuya kungcindezi ephezulu, izinga lokushisa elijwayelekile kuya ekushiseni okuphezulu, izinga lokushisa eliphezulu kuya ekushiseni okuphansi. Njengamanje, ububanzi obukhulu bevalvu yebhola bufinyelele ku-60 Inch, kanti izinga lokushisa eliphansi kakhulu lingafinyelela izinga lokushisa le-hydrogen elinguketshezi -254℃. Izinga lokushisa eliphakeme kakhulu lingafinyelela kusuka ku-850 kuya ku-900℃. Konke lokhu kwenza amavalvu ebhola afaneleke kuzo zonke izinhlobo zemidiya, eziba uhlobo lwevalvu oluthembisayo kakhulu.

Amavalvu ebhola angahlukaniswa ngamavalvu ebhola antantayo kanye namavalvu ebhola e-trunnion ngokusekelwe esakhiweni.

Amavalvu ebhola angahlukaniswa ngamavalvu ebhola angena phezulu kanye namavalvu ebhola angena eceleni. Amavalvu ebhola angena eceleni angahlukaniswa futhi abe amavalvu ebhola elilodwa, amavalvu ebhola amabili kanye namavalvu ebhola amathathu ngokwesakhiwo somzimba wevalvu. Imizimba yamavalvu ebhola elilodwa ibalulekile; amavalvu ebhola amabili aqukethe imizimba yamavalvu ayinhloko kanye nemizimba yamavalvu asekelayo kanye namavalvu ebhola amathathu akhiwe umzimba owodwa wamavalvu ayinhloko kanye nemizimba emibili yamavalvu asekelayo.

Ama-valve ebhola angahlukaniswa ngama-valve ebhola okuvala athambile kanye nama-valve ebhola okuvala aqinile ngokwezinto zokuvala ama-valve. Izinto zokuvala zama-valve ebhola okuvala athambile ziyizinto eziphezulu ze-polymer ezifana ne-polytetrafluoroethylene (PTFE), i-polytetrafluoroethylene eqinisiwe kanye ne-nylon kanye nerabha. Izinto zokuvala zama-valve ebhola okuvala aqinile ziyizinsimbi.