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类型

止回阀总成

外径(mm)

联顶接头

外径(mm)

止动环

内径(mm)

接头螺纹

(RH)

最大密封压力

(Mpa)

FT89
34 89 31 NC26
35/70
FT105
34 105 31 NC31
35/70
FT121
50 121 46 NC38
35/70
FT159
54 159 50 NC46
35/70
FT168
68 168 64.5
NC50
35/70
FT178
68 178 64.5
5 1/2FH
35/70
FT203
68 203 64.5
6 5/8REG
35/70
 TIANHE FT- type Drop-In Check valves is kind of drill stem internal blowout preventing tools.The check valve consists of top landing sub and check in valve.Landing sub connected with stop ring with thread connection,it worked as a sub before check in valve assembly had been dropped.When a blowout is about to happen,the thread connections of the kelly is screwed out immediately and a check valve is placed into the drill pipe and then pumped downward to the required place.Thus the blowout can be prevented.
Drop in check valve
1. Diameter of Drop in check valve
2. Thread connection of Drop in check valve
3. Working pressure of Drop in check valve
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Tianhe Oil Group Huifeng Petroleum Equipment CO. ltd.