Ponahalo ea valve ea bolo e bile ka mor'a Ntoa ea Bobeli ea Lefatše. Le hoja tlhahiso ea valve ea bolo e qalile mathoasong a lekholo la bo20 la lilemo, patent ena ea sebopeho e hlōlehile ho qeta mehato ea eona ea khoebo ka lebaka la lithibelo indastering ea thepa le indastering ea ts'ebetso ea mechini. DuPont United States e qapile polasetiki ea polytetrafluoroethylene (PTFE) ea thepa e nang le polymer e phahameng ho fihlela ka 1943. Mofuta ona oa thepa o na le melemo ea matla a lekaneng a ho hula le ho hatella, elastoplasticity e itseng, thepa e ntle ea ho itlotsa le ho hanyetsa mafome hantle, e loketseng haholo e le thepa ea ho koala 'me e na le phello e tšepahalang haholo ea ho koala. Ho phaella moo, bolo e nang le chitja e phahameng le qetello e ntle ea bokaholimo e ka etsoa e le setho sa ho koala valve ea bolo ka lebaka la nts'etsopele ea mechini ea ho sila bolo. Mofuta o mocha oa valve e nang le bore e felletseng le maeto a rotatory a 90° o kena 'marakeng oa valve, o hohela tlhokomelo e kholo. Lihlahisoa tsa li-valve tsa setso tse kang li-valve tsa ho emisa, li-valve tsa heke, li-valve tsa plug le li-valve tsa serurubele li nkeloa sebaka butle-butle ke li-valve tsa bolo, 'me li-valve tsa bolo li sebelisoa haholo, ho tloha ho bophara bo bonyenyane ho isa ho bophara bo boholo, khatello e tlase ho isa khatellong e phahameng, mocheso o tloaelehileng ho isa mochesong o phahameng, mocheso o phahameng ho isa mochesong o tlase. Hona joale, bophara bo boholo ba valve ea bolo bo fihlile ho 60 Inch, 'me mocheso o tlase ka ho fetisisa o ka fihla mochesong oa haedrojene ea metsi -254℃. Mocheso o phahameng ka ho fetisisa o ka fihla ho tloha ho 850 ho isa ho 900℃. Tsena kaofela li etsa hore li-valve tsa bolo li lokele mefuta eohle ea mecha ea phatlalatso, e leng mofuta o tšepisang ka ho fetisisa oa valve.

Li-valve tsa bolo li ka aroloa ka li-valve tsa bolo tse phaphametseng le li-valve tsa bolo tsa trunnion ho latela sebopeho.

Li-valve tsa bolo li ka aroloa ka li-valve tsa bolo tse kenang ka holimo le li-valve tsa bolo tse kenang ka lehlakoreng. Li-valve tsa bolo tse kenang ka lehlakoreng le tsona li ka aroloa ka li-valve tsa bolo tse nang le karolo e le 'ngoe, li-valve tsa bolo tse nang le likarolo tse peli le li-valve tsa bolo tse nang le likarolo tse tharo ho latela sebopeho sa 'mele oa valve. 'Mele ea li-valve tsa li-valve tsa bolo e nang le karolo e le 'ngoe ke ea bohlokoa; li-valve tsa bolo tse nang le likarolo tse peli li entsoe ka 'mele oa li-valve tse kholo le 'mele oa li-valve tse thusang 'me li-valve tsa bolo tse nang le likarolo tse tharo li entsoe ka 'mele o le mong oa li-valve tse kholo le 'mele e 'meli ea li-valve tse thusang.

Li-valve tsa bolo li ka aroloa ka li-valve tsa bolo tse tiisang ka bonolo le li-valve tsa bolo tse tiisang ka thata ho latela thepa ea ho tiisa li-valve. Lisebelisoa tsa ho tiisa li-valve tsa bolo tse tiisang ka bonolo ke lisebelisoa tse nang le polymer e ngata tse kang polytetrafluoroethylene (PTFE), polytetrafluoroethylene e matlafalitsoeng le nylon hammoho le rabara. Lisebelisoa tsa ho tiisa li-valve tsa bolo tse tiisang ka thata ke litšepe.