Ball check valve is a wellhead inside blowout control tool,in order to achieve safety control in drilling operation.It can effectively solve the problem of overflow,well kick in trip-out process.Put it into the well with dillstem andit can control the mud backpressure automatically.
| Model | OD | ID | Connection | Working Pressure |
| mm (inch) | mm (inch) | API | MPa(PSI) | |
| FQ105 | 104.8(4-1/8) | 50.8(2) | NC31 |
35～70 (5,000～10,000) |
| FQ120 | 127(5) | 57.2(2-1/4) | NC38 | |
| FQ127 | 178(7) | 57.2(2-1/4) | NC38 | |
| FQ165 | 165(6-1/2) | 71.4(2-13/16) | NC50 |
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