Drop-in Type Check Valve : It is an internal preventer.
When blowout happens, the kelly rodwill be removed immediately
and throw the back pressure valve assembly into the water hole
and then pump downward to the required place.
Thus , the blowout can be prevented.
When blowout happens, the kelly rodwill be removed immediately
and throw the back pressure valve assembly into the water hole
and then pump downward to the required place.
Thus , the blowout can be prevented.
Specification of Drop－in Type Check Valve
|
Type
|
Stop Ring I.D.
(mm)
|
Joint
|
Check Valve Assembly
|
Working Pressure
(Mpa)
|
Connection
|
|||
|
O. D
(mm)
|
I.D
(mm)
|
Length
(mm)
|
O.D
(mm)
|
I.D
(mm)
|
||||
|
FT89
|
30
|
89
|
35
|
335
|
33
|
8
|
35 70
|
NC26
|
|
FT105
|
33
|
105
|
38
|
350
|
36
|
10
|
35 70
|
NC31
|
|
FT121
|
50
|
121
|
56
|
395
|
54
|
18
|
35 70
|
NC38
|
|
FT159
|
54
|
159
|
60
|
435
|
58
|
23
|
35 70
|
NC50
|
|
FT168
|
64
|
168
|
70
|
435
|
68
|
33
|
35 70
|
NC50
|
|
FT178
|
64
|
178
|
70
|
515
|
68
|
33
|
35 70
|
5-1/2FH
|
|
FT203
|
64
|
203
|
70
|
620
|
68
|
33
|
35 70
|
6-5/8REG
|