7 | Baker Hughes
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Note: In an emergency, drifts may be used to remove
the seat ring retainer. However, two drifts should be
used and placed in the slots 180° apart and struck
simultaneously.
8.3.2 DVD Removal (Refer to Figure 16)
In case of Camflex with the DVD option, model number 35x3x
or 35x4x, the DVD is installed in the body, it is recommended
to use the DVD wrenches to remove this device (105). Baker
Hughes manufactures and has available, for a nominal price,
DVD wrenches for the Camflex II, 1" through 12" sizes (DN 25
through 300 sizes). lt is highly recommended that wrenches be
purchased or fabricated to facilitate removal and reassembly
of the DVD (105) since SPECIFIC TORQUES MUST BE
ACHIEVED to ensure proper clamping of this DVD plate.
Figure 6 shows the recommended thickness and method
of construction along with specific dimensions to facilitate
construction.
A
H
T
Diameter d
Diameter D
Valve
Size
A
inches
(mm)
d
inches
(mm)
D
inches
(mm)
H
inches
(mm)
T
inches
(mm)
1"
(DN 25)
1.063
(27)
0.142
(3.6)
1.236
(31.4)
0.079
(2)
0.4
(10)
1
1
⁄
2
"
(DN 40)
1.496
(38)
0.157
(4)
1.772
(45)
0.118
(3)
2"
(DN 50)
1.929
(49)
0.157
(4)
2.205
(56)
0.118
(3)
0.7
(18)
3"
(DN 80)
2.913
(74)
0.177
(4.5)
3.248
(82.5)
0.157
(4)
0.8
(20)
4"
(DN 100)
3.858
(98)
0.197
(5)
4.213
(107)
0.275
(7)
0.8
(20)
6"
(DN 150)
5.905
(150)
0.236
(6)
6.260
(159)
0.354
(9)
1.0
(25)
8"
(DN 200)
7.913
(201)
0.236
(6)
8.268
(210)
0.394
(10)
1.0
(25)
10"
(DN 250)
9.843
(250)
0.236
(6)
10.315
(262)
0.394
(10)
1.2
(30)
12"
(DN 300)
11.732
(298)
0.276
(7)
12.204
(310)
0.472
(12)
1.2
(30)
6
0.5
(12)
Figure 6
A.
Secure the valve body in a vise or appropriate holding
device with the plug side facing up (refer to Figure 16).
Care must be taken to avoid damage to the gasket
face on the valve body.
B.
Place DVD plate wrench so it engages retainer lugs.
C.
Engage the retainer wrench with an impact wrench or
suitable wrench and loosen, then remove DVD (105) by
turning counter-clockwise.
9. Maintenance
9.1 Diaphragm Replacement
(Refer to Figures 16 and 17)
The recommended maintenance to be performed on the Camflex
II Spring Diaphragm Actuator is limited to the replacement of the
diaphragm (40). Removal of the actuator from the valve is not
required. To replace the diaphragm, proceed as follows:
The valve must be isolated and free from any service
pressure. All electrical or air pressure to compo-
nent parts must be off. Pressure to actuator must be
relieved.
Handwheel (53) and limit stop (77) must be backed off to allow
free travel of the lever (34).
A.
Bypass the valve, shut off stop valves and isolate valve in
compliance with CAUTION note listed above.
B.
Shut off and disconnect air supply tubing to the actuator.
C.
Remove the four capscrews (41) from diaphragm case (42)
and remove diaphragm case.
D.
Remove diaphragm (40).
Note: Diaphragm is glued to the top of the piston (43).
E.
Remove tape or glue from the top of the piston and clean
thoroughly.
F.
Clean diaphragm case (42) and spring barrel (38) at the
area that engages the diaphragm bead in preparation for
reassembly.
Note: To hold the diaphragm in place on the piston, an
adhesive disc (adhesive both sides) or rubber cement
is used. If rubber cement is used, it should be applied
to both the piston and the diaphragm or in accordance
with the manufacturer’s directions for the adhesive
used. For recommended adhesives see Figure 15.
For the diaphragm replacement, use one of the two following
methods:
Method 1: Points G-1 / H-1 / I-1 / J-1 / K-1
G-1.
Apply adhesive tape or cement to the top of the piston.
H-1.
The inscription “Piston Side” is located on the diaphragm
(40). If used, apply cement to this side of the diaphragm.
