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Drop-in check valve

The Drop-in check valves is an inner blowout preventer within drill string. When there is blowout omen, the drill pipe will be discharged immediately, and put the return pressure assembly into waterhole of drill pipe. It will achieve blowout control's purpose. Frankly, the tool prevent return flow during a kick and are suitable for most drilling situations in which return flow through the drill string is a risk and normal operation the drill pipe, but allowing fluid to be pumped downward to circulate the well, the valves provide the driller with the means to control the drill pipe pressures when required, significantly improving and simplifying we control.
Construction
The Drop-in check valve is divided into landing sub and check valve.