Double Function Arrow-shaped Back Pressure Valve Type SJF
Model “SJF” Double Function Arrow-shaped Back Pressure Valve is a integrated tool which has functions of both the arrow-shaped back pressure valve and the mud globe valve. When used, the tool can not only prevent down-hole kick from blowout, but also prevent the mud in the Kelly and hose from flowing out, thus reducing mud loss and ensuring a clean of rig floor.
Specifications
| Model | O.D. mm(in) | Connection thread of upper end
|
Connection thread of lower end
|
Max. Kick preventing Pressure
MPa |
Check pressure MPa | Length mm(in) |
| SJF89 | 89(3 1/2) | NC26 | NC26 | 50 | 0～3 | 500(19 5/8) |
| SJF121 | 121(4 3/4) | NC38 | NC38 | 50 | 0～3 | 474(18 5/8) |
| SJF159 | 159(6 1/4) | NC50 | NC50 | 50 | 0～3 | 561(22) |
| SJF165 | 165(6 1/2) | NC50 | NC50 | 50 | 0～3 | 642(25 3/4) |
| SJF178 | 178(7) | 51/2FH | NC50 | 50 | 0～3 | 561(22) |