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API 7-1 Drilling String Valves
Mavavu a zingwe zobowola amaletsa madzi kutuluka mmwamba chingwe chobowola nthawi zambiri ngati kubowola kukankhira pansi pang'ono.LANDRILL imatha kupereka valavu yachitetezo chokwanira (FOSV), valavu ya Kelly, Chotsekereza mkati mkati (IBOP), valavu yolowera mkati. , Vavu yoyandama.
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