Float valve is one of necessary tool for oil drilling,it consists of float valve sub and foat valve,the main function is to prevent mud brings drill cuttings,sediment backfilling which will cause bit bore blocked when connecting each joint.When the well blowout or kick, the valve cover of foat valve turn off the bore automatically,it will prevent well blowout accident
| Model | FV OD | FV OAL | BFF OD | ToolJoint Box Connections and BFF Depth | |||
| Connection | BFF Depth | Connection | BFF Depth | ||||
| mm(inch) | mm(inch) | mm(inch) | API | mm(inch) | API | mm (inch) | |
| 1R | 42.07(1-21/32) | 149.2(5-7/8) | 42.86(1-1l/16) | 2-3/8REG | 231.8(9-1/8) | NC23 | 231.8(9-1/8) |
| IF-2R | 48.42(1-29/32) | 158.8(6-1/4) | 49.21(1-15/16) | 2-7/8REG | 254(10) | 2-3/8 IE | 241.3(9-1/2) |
| 2F-3R | 61.12(2-13/32) | 165.1(6-1/2) | 61.91(2-7/16) | 3-1/2REG | 266.7(10-1/2) | 2-7/8 IF | 260.4(10-1/4) |
| 3F | 71.44(2-13/16) | 254(10) | 72.23(2-27/32) | 3-1/2 FH | 355.6(14) | ||
| 3-1/2IF | 79.38(3-1/8) | 254(10) | 80.17(3-5/32) | 3-1/2 IF | 362(14-1/4) | ||
| 4R | 88.11(3-15/32) | 211.1(8-5/16) | 88.9(3-1/2) | 4-1/2REG | 325.4(12-13/16) | NC44 | 331.8(13-1/16) |
| 4F | 92.87(3-21/32) | 304.8(12) | 93.66(3-11/16) | – | —- | 4 IF | 425.4(16-3/4) |
| 5R | 98.43(3-7/8) | 247.6(9-3/4) | 99.22(3-29/32) | 5-1/2REG | 374.7(14-3/4) | 4-1/2 IF | 368.3(14-1/2) |
| 5F-6R | 121.44 (4-25/32) | 298.4(11-3/4) | 122.24 (4-13/16) | 6-5/8REG | 431.8(17) | 5-1/2 IF | 431.8(17) |
| — | 7-5/8REG | 438.2(17-1/4) | 5-1/2 FH | 431.8(17) | |||
| —- | —- | —- | 8-5/8REG | 441.3(17-3/8) | NC61 | 444.5(17-1/2) | |
| 6F | 144.46(5-11/16) | 371.5(14-5/8) | 145.26(5-23/32) | 8-5/8REG | 514.4(20-1/4) | 6-5/8 IF | 504.8(19-7/8) |
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