FULL OPENING SAFETY VALVE
Full opening safety valve is manual control valve in drill string circulating system，and it is one of the effective tools to prevent blowout in the drilling operation, in order to avoid malignant accidents，full opening safety valve shall be connected between drill pipes in drilling operation. The special wrench of full opening safety valve rotates 90 ° switch can be achieved on and off. And when need to lift drill pipes or Kelly has not be lifted，as a precaution, it is better to install fully opening safety valve.
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