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Control-Disk Valve
June 2017
Table 6. Follower Shaft Internal Threads
DN
50
80
100
180
200
250
300
1. For valves with a two-piece, split-shaft design only. DN 200 - 300 (NPS 8-12) valves changed to a one-piece, through-shaft design in 2015.
Table 7. Recommended Blind Flange Bolt Torque
DN
50 to 150
200, 250
300
3. Clean the gasket surfaces on the blind flange (key 17) and on the end of the valve body (key 1).
4. Rotate the disk (key 3) to the fully open position.
5. Refer to figure 6 and determine the location of the smaller end of the taper pins (key 8). Drive out the taper pins and
expansion pins (key 7) towards the larger end.
WARNING
Once the shafts have been removed in the following step, the disk may fall from the valve body. To avoid personal injury
and disk damage, support the disk to prevent it from falling as the shafts are being removed.
6. For valves with a two-piece, split-shaft, pull the follower shaft (key 11) out through the outboard end of the valve
body. If the follower shaft cannot be pulled free, the end of the follower shaft is internally threaded (see table 6) for
screwing in a bolt or stud to aid in pulling the follower shaft.
7. Pull the drive shaft (key 10) out through the actuator end of the valve body and remove the anti‐blowout ring (key
40) from the drive shaft..
8. Remove the disk (key 3) from the valve body.
9. Remove the packing (key 24, figure 4) and the packing box ring (key 23, figure 4).
10. If either of the bearings (key 6) require replacement, remove them.
11. Clean the packing box and [metal packing box parts].
Assembly
WARNING
Do not lubricate bearings that will be used for oxygen service, or where the lubrication is incompatible with the process
media. Any use of lubricant can lead to the sudden explosion of media due to the oil/oxygen mixture, causing personal
injury or property damage.
14
VALVE SIZE
VALVE SIZE
NPS
2 to 6
8, 10
12
NPS
2
3
4
6
8
10
12
NSm
9.5
23
45
Instruction Manual
D103298X012
THREAD SIZE
M8 X 1.25
M10 X 1.50
M12 X 1.75
M16 X 2.00
(1)
M20 X 2.50
(1)
M20 X 2.50
(1)
M24 X 3.00
TORQUE
lbfSft
7.0
17
33
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