Drill pipe fl oat valve sub consists of the body and fl oat valve assembly. The fl oat valve assembly is installed into the body when using . The backpressure action of spring make the fl oat valve assembly closed. it is opened as circulating mud downward and the mud can fl ow through it .The fl oat valve assembly is closed as there is the backpressure. The fl oat valve assembly has two type: G type ans F type
Technical parameters and specifi cations
| Type |
O.D.(mm) |
Connection (mm) |
Cage O.D.(mm) |
Cage O.D.(mm) |
Min Flow Area(cm2) |
Working
Pressur(Mpa |
| FZF 279 |
279 |
8 5/8REG |
121 |
76 |
45 |
70;35 |
| FZF 241 |
241 |
7 5/8REG |
121 |
76 |
45 |
| FZF 203 |
203 |
6 5/8REG |
121 |
76 |
45 |
| FZF 165 |
165 |
NC50 |
98 |
71 |
39.6 |
| FZF 159 |
159 |
NC46 |
88 |
60 |
28.3 |
| FZF 121 |
121 |
NC38 |
74 |
54 |
22.9 |
| FZF 105 |
105 |
NC31 |
61 |
38 |
11.3 |
| FZF 89 |
89 |
NC26 |
49 |
32 |
8.0 |
| FZF 79 |
79 |
2 3/8REG |
42 |
25 |
4.9 | |
