Indastering ea morao-rao le mefuta eohle ea tsamaiso ea ho fana ka metsi, likarolo tsa li-valve li phetha karolo ea bohlokoa. Ba tšoana le balebeli ba tšepahalang, ba lebelang tšebetso e tsitsitseng ea tsamaiso ka lenyele, empa hape ba tšoana le mokhanni ea sa tieang, ea laolang motsamao o mong le o mong oa mokelikeli ka nepo.

Ho latela pono ea taolo ea phallo, kopano ea li-valve ke senotlolo sa bohlokoahali. Lits'ebetsong tse ngata tsa tlhahiso, phallo ea mokelikeli e hloka ho lokisoa hantle ho latela litlhoko tse fapaneng tsa ts'ebetso. Ka mohlala, tlhahisong ea lik'hemik'hale, phallo ea thepa e tala e tlameha ho laoloa ka nepo ho netefatsa hore liphetoho tsa lik'hemik'hale li etsahala ka lebelo le tekanyo e reriloeng esale pele. Li-valve tsa taolo li ka fetola ho buloa ha li-valve, phetoho e ntle ea sebaka sa phallo ea mokelikeli, e le ho fihlela taolo e nepahetseng ea phallo. Sena se tšoana le ho laola ka nepo boholo ba phallo ea metsi, e le hore lerotholi le leng le le leng la metsi le ka sebetsa ka nako le sebaka se nepahetseng, ho qoba likotsi tsa tlhahiso kapa mathata a boleng ba sehlahisoa a bakoang ke phallo e ngata haholo kapa e fokolang haholo.

Likarolo tsa li-valve li ke ke tsa nkeloa sebaka le ho feta ha ho tluoa taolong ea khatello. Liphetoho tsa khatello ha mokelikeli o phalla ka pipeline li ka ba le tšusumetso e kholo tsamaisong eohle. Sephahla sa tšireletso ke kopano ea valve e etselitsoeng ho sireletsa tsamaiso khatellong e feteletseng. Ha khatello ea tsamaiso e feta boleng bo behiloeng, valve ea tšireletso e bula ka ho toba ho lokolla khatello e feteletseng, ho thibela liphello tse tebileng tse kang ho phatloha ha liphaephe le tšenyo ea thepa. Li-valve tse fokotsang khatello, ka lehlakoreng le leng, li fokotsa metsi a nang le khatello e phahameng ho ea boemong bo loketseng ba khatello ho finyella litlhoko tsa lisebelisoa kapa mekhoa e latelang. Ka kopanelo, ba boloka botsitso ba khatello ka har'a sistimi, joalo ka ho kenya mochine o bohlale oa khatello bakeng sa sistimi.

Taolo ea phallo e boetse ke e 'ngoe ea mesebetsi ea bohlokoa ea likarolo tsa li-valve. Likhoebong tse rarahaneng tsa lipeipi, maro a hloka ho latela tsela e itseng. Li-valve tsa ho hlahloba li etsa bonnete ba hore mokelikeli o ka phalla ka lehlakoreng le le leng, ho thibela ho khutlela morao ho etsahala. Ka mohlala, tsamaisong ea metsi le tsamaiso ea metsi, li-valve tsa ho hlahloba li ka thibela likhoerekhoere ho phalla morao, ho sireletsa bohloeki ba metsi le mosebetsi o tloaelehileng oa tsamaiso. Li-valve tsa litsela tse tharo, li-valve tsa litsela tse 'nè, joalo-joalo li ka hlokeha ho fetola tataiso ea phallo ea mokelikeli, e le hore mokelikeli o makala a fapaneng a liphaephe ka tsela e hlophisehileng, bakeng sa ts'ebetso e bonolo ea tsamaiso eohle e fane ka tiiso.

Ka bokhutšoanyane, likarolo tsa li-valve ke karolo ea mantlha ea tsamaiso ea mokelikeli le tsamaiso ea taolo. Ba netefatsa ts'ebetso e bolokehileng, e tsitsitseng le e sebetsang hantle ea tlhahiso ea indasteri, lisebelisoa tsa masepala le masimo a mang a mangata ka ho laola ka katleho phallo, khatello le tataiso ea phallo, e leng ntho e ka sehloohong e lokeloang hantle lefapheng la boenjiniere ba morao-rao.