Ea ronathaereli-valve extensionsli etselitsoe ho sebetsana le litlhoko le lits'ebetso tse fapaneng.Hore na o hloka phihlello e atolositsoeng bakeng sa lithupa tsa li-valve tse thata ho fihlella kapa o hloka ho feto-fetoha ha maemo bakeng sa ho phahama le ho lekola khatello ea thaere, re na le tharollo bakeng sa hau.Likatoloso tsa li-valve tsa rona li entsoe ho fihlela litekanyetso tse phahameng ka ho fetisisa tsa boleng le ho ts'epahala, ho netefatsa ts'ebetso e nepahetseng le bophelo bo bolelele.Bakeng sa ba batlang khetho e bobebe le e feto-fetohang, ronali-valve stem extenderske khetho e ntle.E entsoe ka thepa ea polasetiki e tšoarellang nako e telele, li-extensions tsena li fana ka khokahanyo e sireletsehileng le e ka tšeptjoang ho lithupa tsa valve tsa koloi ea hau.Ka ho kenya habonolo le moralo o bonolo oa basebelisi, lisebelisoa tsa rona tsa polasetiki tsa li-valve li fana ka boiketlo le bonolo, tse lumellang tlhokomelo ea mabili ntle le mathata.Haeba u khetha khetho e matla le e tšoarellang, ea ronametal valve stem extenderske tharollo e loketseng.E entsoe ka lisebelisoa tsa tšepe tsa boleng bo holimo, li-extensions tsena li fana ka matla a ikhethang le bophelo bo bolelele.E etselitsoe ho mamella maemo a thata, li-valve tsa rona tsa tšepe li fana ka khokahano e tšepahalang le e sireletsehileng, e netefatsang ts'ebetso e nepahetseng ea mabili le tlhokomelo.Ntle le likhetho tsa polasetiki le tšepe, re boetse re fana ka tsonalisebelisoa tsa li-valve tsa lebili la rabara.Likatoloso tsena li etselitsoe ho tenyetseha le ho ikamahanya le maemo, li u lumella ho fihlella habonolo le ho fihlella likutu tsa valve.E entsoe ka lisebelisoa tsa rabara tse tšoarellang, lisebelisoa tsa rona tsa li-valve tsa mabili a rabara li fana ka tiiso e tiileng le ho boloka moea o motle haholo.Ka ho tiea le ho feto-fetoha ha tsona, lisebelisoa tsena li loketse mefuta e fapaneng ea lithaere le lits'ebetso.