8580 Valve
Instruction Manual
March 2010
13
Table 7. Recommended Blind Flange Bolt Torque
VALVE SIZE TORQUE
DN NPS
NSm lbfSft
50 to 150 2 to 6 9.5 7.0
200, 250 8, 10 23 17
300 12 45 33
Disassembly
1. Remove the seal ring assembly according to
steps 3 and 4 of the Replacing Seal Ring section on
page 11 of this manual.
2. Remove hex nuts, blind flange, gasket, spacer (if
present), follower spring seats, and follower spring
(keys 19, 17, 16, 15, 9, and 12).
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. 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 fing (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.
CAUTION
To avoid possible product damage,
ensure the bearing tabs are oriented
correctly when installing in the
following procedure. See figure 5 for
proper orientation of the bearings.
1. If new bearings (key 6) are required, install and
orient them in the valve body, as shown in figure 5.
Ensure the bearings are fully seated, contacting the
inside diameter of the valve body.
2. Insert the disk into the valve body as shown in
figure 6, ensuring the “T” stamped on the disk hub is
oriented toward the actuator end of the valve body.
3. Install the drive shaft (key 10) through the valve
body into the disk.
The disk/shaft connection utilizes taper and
expansion pins. The hole for the drive shaft
connection is slightly off-center to prevent the drive
shaft from being installed in the wrong orientation.
Orient the position indication mark on the end of the
shaft with the face of the disk as shown in figure 7.
The hole for the follower shaft connection is
on-center. Insert the expansion pins into the disk
until they are seated, as shown in figure 6. Once in
place, insert the taper pins. The taper pins must be
driven into the disk/shaft/expansion pin assemblies
until “solid contact” is felt. “Solid contact” can be
identified by the sound of the hammer blow and the
bounce felt in the hammer.
4. Reinstall the follower spring/spring seat assembly
(keys 9, 12, and 9, figure 8) inside the follower shaft.
5. Install the spacer (key 15) if used, and the
gasket, blind flange, and hex nuts (keys 16, 17,
and 19). Ensure the blind flange is oriented so the
serrations face the gasket and valve body. Tighten
the hex nuts (key 19) per table 7.
6. The valve must be closed during seal ring
installation to permit accurate centering of the seal.
To install the new seal ring assembly or flow ring:
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