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This Float Valve is normally installed in a standard bore-back of bit sub, to provide fluid flow control at the bottom of the drill stem. It also prevents backflow of cuttings from plugging the drill bit jets while making connections.
| Type | Dia. Of valve Assembly mm(inch) | Dia of Float recess mm(inch) | Length of valve assembly mm(inch) | Sub Box | Other popular connection | ||
| Connection API | Depth of Recess mm(inch) | Connection API | Depth of Recess mm(inch) | ||||
| 1R | 42.1(1 21/32) | 42.9 (1 11/16) | 149.2 (5 7/8) | 2 3/8REG | 231.8 (9 1/8) | NC23 | 231.8 (9 1/8) |
| 1F-2R | 48.42(1 29/32) | 49.21(1 15/16) | 158.8(6 1/4) | 2 7/8REG | 254(10) | 2 3/8IF | 241.3(9 1/2) |
| 2F-3R | 61.1 (2 13/32) | 61.9 (2 7/16) | 165.1 (6 1/2) | 3 1/2REG | 266.7 (10 1/2) | NC31 | 260.35 (10 1/4) |
| 3F | 71.44(2 13/16) | 72.23(2 27/32) | 254(10) | 3 1/2FH | 355.6(14) | ||
| 3 1/2IF | 79.4 (3 1/8) | 80.2 (3 5/32) | 254 (10) | NC38 | 362.0 (14 1/4) | ||
| 4R | 88.1 (3 15/32) | 88.9 (3 1/2) | 211.1 (8 5/16) | 4 1/2REG | 325.4 (12 13/16) | NC44 | 331.8 (13 1/16) |
| 4F | 92.87(3 21/32) | 93.66(3 11/16) | 304.8(12) | 4IF | 336.6(13 1/4) | ||
| 5R | 98.4 (3 7/8) | 99.2 (3 29/32) | 247.7 (9 3/4) | 5 1/2REG | 374.7 (14 3/4) | NC50 | 368.3 (14 1/2) |
| 5F-6R | 121.4 (4 25/32) | 122.2 (4 13/16) | 298.5(11 3/4) | 6 5/8REG | 431.8 (17) | 5 1/2IF | 431.8 (17) |
| - | - | - | 7 5/8/REG | 438.2(17 1/4) | 5 1/2FH | 431.8(17) | |
| - | - | - | 8 5/8REG | 441.3(17 3/8) | NC61 | 438.2(17 1/4) | |
| 6F | 144.46(5 11/16) | 145.26(5 23/32) | 371.5(14 5/8) | 8 5/8REG | 514.4(20 1/4) | 6 5/8IF | 504.8(19 7/8) |
Float Valve (Flapper Type and F Type Check Valve)