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Type FT Drop Check Valve   It is an inside BOP(blowout preventer)in the drill string￡?It is simple in structure and easy to operate. When blowout is going to be happened￡áthe thread connections of the Kelly are screwed out immediately and the back pressure valve is put into the I.D.of drill pipe and then pumped downward to the required place￡áThus the blowout accident can be prevented. The tool is consisting of landing sub and checd valve assembly￡áThe landing is thread connected with stop ring and tightened on and put into downhole with drill string￡áThe landing sub is used as a sub above driIl string before check valve is run in downhole. Specifications

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