Instruction Manual
D103298X012
Control-Disk Valve
June 2017
14
Table 6. Follower Shaft Internal Threads
VALVE SIZE
THREAD SIZE
DN
NPS
50
2
M8 X 1.25
80
3
M10 X 1.50
100
4
M12 X 1.75
180
6
M16 X 2.00
200
8
M20 X 2.50
(1)
250
10
M20 X 2.50
(1)
300
12
M24 X 3.00
(1)
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
VALVE SIZE
TORQUE
DN
NPS
N
S
m
lbf
S
ft
50 to 150
2 to 6
9.5
7.0
200, 250
8, 10
23
17
300
12
45
33
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.
