API 7-1 Drilling String Valves
Cov hlua khi ntawm cov laum yuav tiv thaiv cov kua dej kom tsis txhob ntws mus rau ntawm cov hlua khi yog tias lub laum ncaws tawm thaum lub ntsis tawm hauv qab. LANDRILL tuaj yeem muab cov khoom zoo tshaj plaws rau lub qhov (FOSV), Kelly valve, Inside blowout preventer (IBOP), Drop-in check valve, Float valve.
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