Li-valve tsa Khoele ea ho Cheka

Li-valve tsa khoele ea ho phunya li thibela mokelikeli ho phalla khoeleng ea ho phunya khafetsa haeba drill e raha ka karolo e ka tlase. LANDRILL e ka fana ka boleng bo holimo ba valve ea polokeho e felletseng (FOSV), valve ea Kelly, Mothibeli oa ho phatloha ha moea ka hare (IBOP), valve ea ho hlahloba ho theoha, valve ea ho phaphamala.