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) |
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