Float valve is one of the necessary tool for oil drilling, it consists of float valve sub and float valve, The main function are to prevent drill cuttings come into mud when connecting each joint and the bit bore block caused by back flow of silt. When the well blowout or kick, the valve cover of float valve turns off the bore automatically, it will prevent well blowout accident. The working pressure of float valve is supposed to be 5000psi or 10000psi.
Valve | Diameter of valve assembly | Diameter of float recess | Length of valve assembly | API REG bit box | Other popular connections | |||
D | DFR | LFV | Label | LR | Dbp | Label | LR | |
Ref. | +0,4 0 | (Reference) | ±1.6 | +0,8 0 | ±1,6 | |||
1R | 42,1 | 42,9 | 149,2 | 2 3/8 Reg | 231,8 | 33,3 | NC23 | 231,8 |
1F-2R | 48,4 | 49,2 | 158,8 | 2 7/8 Reg | 254,0 | 38,1 | NC26 | 241,3 |
2F-3R | 61,1 | 61,9 | 165,1 | 3 1/2 Reg | 266,7 | 48,4 | NC31 | 260,4 |
3F | 71,4 | 72,2 | 254,0 | — | — | — | 3 1/2 FH | 355,6 |
3-1/2 IF | 79,4 | 80,2 | 254,0 | — | — | — | NC38 | 362,0 |
4R | 88,1 | 88,9 | 211,1 | 4 1/2 Reg | 325,4 | 74,6 | NC44 | 331,8 |
4F | 92,9 | 93,7 | 304,8 | — | — | — | NC46 | 425,4 |
5R | 98,4 | 99,2 | 247,6 | 5 1/2 Reg | 374,6 | 85,7 | NC50 | 368,3 |
5F-6R | 121,4 | 122,2 | 298,4 | 6 5/8 Reg | 431,8 | 108,7 | 5 1/2 IF | 431,8 |
121,4 | 122,2 | 298,4 | 7 5/8 Reg | 438,2 | 108,7 | 5 1/2 FH | 431,8 | |
121,4 | 122,2 | 298,4 | 8 5/8 Reg | 441,3 | 108,7 | NC61 | 444,5 | |
6F | 144,5 | 145,2 | 371,5 | 8 5/8 Reg | 514,4 | 131,8 | 6 5/8 IF | 504,8 |
Float valve recess in bit subs Specifications | ||||||
Model | Sub O.D. | Joint connection | Valve O.D.(mm) | I.D.(mm) | ||
FFJT241 | 241.3 | 7 5/8REG B*B | 0121(5F6R) | 76.2 | ||
FFJT228 | 228.6 | 7 5/8REG B*B | 0121(5F6R) | 76.2 | ||
FFJT209 | 209.6 | 6 5/8REG B*B | 0121(5F6R) | 71.4 | ||
FFJT203 | 203.2 | 6 5/8REG B*B | 0121(5F6R) | 71.4 | ||
FFJT178 | 177.8 | 4 1/2REG B*NC50 B | 088(4R) | 71.4 | ||
FFJT165 | 165.1 | 4 1/2REG B*NC50 B | 088(4R) | 71.4 | ||
FFJT159 | 158.8 | 4 1/2REG B*NC46 B | 088(4R) | 71.4 | ||
FFJT127 | 127 | 3 1/2REG B*NC38 B | 061(2F3R) | 50.8 | ||
FFJT105 | 104.8 | 2 7/8REG B*NC31 B | 048(1F2R) | 38.1 | ||
