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API 7-1 Drilling String Valves
Drill string valves stop fluid from flowing up the drill string often if the drill kicks with the bit off bottom.LANDRILL can supply premium quality Full opening safety valve(FOSV), Kelly valve, Inside blowout preventer(IBOP), Drop-in check valve, Float valve.
5-1203 Dahua Digital Industrial Park Tiangu 6th Road,Hi-tech development Zone Xi'an, China 
86-13609153141 
