Float valve sub is usually connected at the top of the bit to control down hole liquid. While stopping pump and connecting with single, it can prevent waterhole from being plugged by reflowing drillings. When blowout occurred, it can serve as splash valve to prevent liquid flowing into drilling tools
Float valve sub consists of sub, float valve unit and accessory extractor. While using, float valve unit should be put into joint body. Float valve unit is composed of body, sealed ring, seal gland, valve bonnet, torsional spring and limit marker.
Specification of Float Valve Sub:
|
Type
|
O.D. (mm)
|
(mm)
O.D. of Float Valve Core
|
(mm)
I.D. of Float Valve Core
|
Joint Thread
|
|
FJT108
|
108
|
61
|
32
|
3 1/2″REG
|
|
FJT121
|
121
|
61
|
38
|
3 1/2″REG
|
|
FJT146
|
146
|
88
|
50
|
4 1/2″REG
|
|
FJT165
|
165
|
98
|
71
|
NC50
|
|
FJT178
|
178
|
98
|
71
|
NC50
|
|
FJT203
|
203
|
121
|
76
|
6 5/8″REG
|
|
FJT209
|
209
|
121
|
76
|
6 5/8″REG
|
|
FJT228
|
228
|
121
|
76
|
7 5/8″REG
|
|
FJT241
|
241
|
121
|
76
|
7 5/8″REG
|