Specifications
API Type SJF Double Function Arrow-shaped Back Pressure Valvefunction: both arrow-shaped back pressure valve & mud globe valve
API Type SJF Double Function Arrow-shaped Back Pressure Valve
The double function arrow-shaped back pressure valve type SJF is an integrated tool which has functions of both the arrow-shaped back pressure valve and the mud globe valve. The tool can not only prevent downhole kick from blowout, but also prevent the mud in the Kelly and hose from flowing out. Moreover, it can reduce mud loss and ensure a clean rig floor.
Specification Series and Performance Parameters
Type | O.D. mm(in.) | Upper Connection API | Lower Connection API | Max. KickPreventing Pressure MPa | Cut-off Pressure MPa | Overall Length mm (in.) |
SJF89 | 89 (3 1/2) | NC26 | NC26 | 50 | 0~3 | 500 (19.69) |
SJF121 | 121 (4 3/4) | NC38 | NC38 | 50 | 0~3 | 474 (18.66) |
SJF159 | 159 (6 1/4) | NC50 | NC50 | 50 | 0~3 | 561 (22.09) |
SJF165 | 165 (6 1/2) | NC50 | NC50 | 50 | 0~3 | 642 (25.28) |
SJF178 | 178 (7) | 5 1/2FH | NC50 | 50 | 0~3 | 561 (22.09) |