Inside B.O.Ps and
Drop-In Check Valves
110
NON-RETRIEVABLE DROP-IN CHECK VALVE
The Griffith • Vector non-retrievable drop in check valve operates in a
similar manner as the retrievable valve, with the exception that once the
valve is landed in the sub, it is not possible to retrieve it on wireline.
The valve must be removed on the surface.
Non-Retrievable Drop-In Check Valves
Landing Sub O.D.
inches
4.75
6.25
7.75
(mm)
(121)
(159)
(197)
Series
733
750
751
Standard Connection
3 1/2 IF
4 1/2 IF
6 5/8 FH
Landing Sub I.D.
inches
2.180
2.468
2.750
(mm)
(55)
(63)
(70)
Check Valve O.D.
inches
2.120
2.400
2.690
(mm)
(54)
(61)
(68)
Check Valve I.D.
inches
0.750
0.875
1.000
(mm)
(19)
(22)
(25)
Specifications subject to change without notice. Series shown are 10,000 psi working
pressure. Other than standard connections available on request. To order: Specify O.D.,
connections and minimum drillstring I.D.
Retrievable Drop-In Check Valve
Landing Sub O.D.
inches
4.75
4.75
6.12
6.63
(mm)
(121)
(121)
(155)
(168)
Series
825
829
830
821
Standard Connection
3 1/2 IF
4 1/2 IF
4 1/2 IF
4 1/2 IF
Working Pressure
psi
10,000
10,000
10,000
5,000
(kPa)
(69 000)
(69 000)
(69 000)
(35 000)
Landing Sub I.D.
inches
1.791
2.062
2.205
2.625
(mm)
(45.49)
(52.37)
(56.01)
(66.68)
Check Valve O.D.
inches
1.875
2.188
2.312
2.750
(mm)
(47.63)
(55.58)
(58.72)
(69.85)
Check Valve I.D.
inches
0.688
0.875
0.875
1.500
(mm)
(17.48)
(22.23)
(22.23)
(38.10)
Specifications subject to change without notice. Other than standard connections available
on request. To order: Specify O.D., connections and minimum drillstring I.D.
INSIDE B.O.P./STABBING VALVE – DART TYPE
Griffith • Vector inside B.O.P./stabbing valves are designed to control or
prevent a backflow condition when the kelly or top drive is disconnected
from the drillpipe. Essentially a one-way check valve, they have a flush
O.D. to permit them to be stripped through annular blow-out preventers.
Releasing tools are supplied with the valve and they are used to
hold the valve in the open position to allow it to be used as a stabbing
valve. If a kick or backflow condition develops, the open valve can be
easily stabbed and threaded into the drillpipe.
Unlocking the releasing tool allows the valve to close, preventing
further back flow from the drillpipe. The releasing tool is then
removed and normal circulation can be resumed through the valve to
re-establish control of the well. Sizes not listed available on request.
Inside B.O.P.s, Dart Type
Nominal Size
3 1/2
4 1/2
5
Series
791
780
793
Standard Connection
3 1/2 IF
4 1/2 IF
6 1/2 FH
O.D.
inches
4.75
6.50
8.00
(mm)
(121)
(165)
(203)
Length
inches
28.5
29.0
34.5
(mm)
(725)
(735)
(749)
Weight
lbs
100
225
360
(kg)
(45)
(100)
(163)
Specifications subject to change without notice. Series shown are 15,000 psi working
pressure. Other than standard connections available upon request. To order: Specify O.D.
and connections.
RETRIEVABLE DROP-IN CHECK VALVE
The Griffith • Vector retrievable drop-in check valve provides a means of
controlling back flow through the drillpipe during a kick or when tripping
pipe into the hole against pressure.
The landing sub is installed in the drilling string, usually just above
the drill collars. The valve is kept on the surface until protection from
back flow is required. The valve is introduced into the drillstring and
pumped down the drillstring to the landing sub where it locks into
position.
Pressure from below the landed valve energizes the packer, lock
dogs and check valve. The check valve will open to allow circulation
through the valve and automatically close when circulation is stopped.
After use, the back pressure valve can be retrieved from the string with
the retrieval tool run in on wireline.
The landing sub body is manufactured from 4145 heat treated and
stress relieved material. Sizes not listed available on request.
RETRIEVABLE DROP-IN CHECK VALVE
