Model NFQ IBOP
Model NFQ inner blowout preventer is a necessary blowout preventing device during drilling process specified by IADC (International Association of Drilling Contractors). If any well kick or overflow occurs, the inner blowout preventer shall be used, because the important thing at this moment is to land the drilling rods into the well as many as possible, and this can be done only by installing a pressure-returning device in the drill string.
Specifications
| Product Code | O.D mm（in） | Connection | Pressure grade （Mpa） |
| NFQ105 | 105(4 1/8) | NC31 | 70、105 |
| NFQ127 | 127(5) | NC38 | 70、105 |
| NFQ159 | 159(6 1/4) | NC46 | 70、105 |
| NFQ168 | 168(6 5/8) | NC50 | 70、105 |
| NFQ178 | 178(7) | 5 1/2FH | 70、105 |
| NFQ184 | 184(7 1/4) | 5 1/2FH | 70、105 |