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If the packing is in good condition, it is
possible to remove and replace the seal
assembly, or dome assembly without
removing the packing box assembly.
However, the packing assembly must be
removed to remove the ball (key 11) from
the valve body.
6. Remove the packing housing nuts (key 23). Re-
move the packing housing assembly from the valve.
The assembly includes all the packing box parts, drive
shaft, O-ring seals, bearing, and other parts.
7. Remove the nuts from the studs (keys 19 and 3) to
remove the tailpiece/valve connection. (Refer to
figure 6).
While lifting the tailpiece (key 2 or 6)
from the valve body, check to see if the
seal assembly is lifting with the tailpiece.
(Note: Some valve constructions do not
have a seal assembly installed in the tail-
piece.) If it is, slide something between
the ball and tailpiece to protect the ball
in case the seal assembly falls out of the
tailpiece.
8. If the valve has dual attenuator domes, tap the
dome to loosen it from the top tailpiece before the top
tailpiece is lifted from the valve body.
9. Turn the tailpiece over so the seal assembly is fac-
ing up, and place it on a clean soft surface with the
flange face down.
10. From the tailpiece assembly or from the valve,
remove the seal assembly, wave spring, and O-ring
seal (keys 8 and 7). Clean and protect all sealing sur-
faces.
WARNING
In the next step, be sure to secure the
bearing plates on the ball to prevent
them from falling. When lifting the ball,
the bearing plates may slide-off the ball
trunnions which may cause personal in-
jury or property damage.
11. Turn the ball (key 11) to the closed position. Use
a nylon sling through the ball bore to lift the ball out of
Note
Note
the valve body. Lift the ball and set it on a clean soft
surface.
12. Remove the two bearing plates and thrust wash-
ers (key 4 and 30) from the ball (key 11). Inspect the
bearing in the bearing plates and thrust washers (keys
29 and 30). If necessary, remove and replace the
bearings (key 29).
13. Evenly loosen the hex nuts from the studs on the
lower tailpiece (key 2 or 6). Remove the valve body
from the tailpiece.
14. Remove from the tailpiece assembly, the dome
assembly and/or the seal assembly, wave spring, and
O-ring seal. Clean and protect all sealing surfaces.
Assembly
Be sure to replace valve parts in the same position
that they were removed. Use the following suggested
sequence to reassemble the valve.
Clean and protect all sealing surfaces
from damage while installing parts. Lu-
bricate parts when necessary as an aid
for installing parts, and to help protect
sealing surfaces.
Key number locations are shown in figure 6.
1. Place the tailpiece (key 2 or 6), pipe flange end
down on a clean soft surface with the seal assembly or
attenuator dome cavity facing up.
2. Lubricate and install the O-rings (key 12) on both
tailpieces.
For characterized domes, install the grooved end of
the dome groove pin (key 33) into the tailpiece, as far
as it will go. Use only a light tapping force, taking care
not to bend the pin. This groove pin will prevent the
attenuator dome from rotating with respect to the tail-
piece.
3. Install the inlet end attenuator dome (key 28 or 10)
into the tailpiece (key 6). Use the lifting lugs in the two
threaded holes for ease of handling.
For characterized attenuators, align the pin hole in the
dome with the groove pin (key 33) placed in the tail-
piece in step 3. High Density attenuators don't require
this orientation.
For dual seal V260A or V260B constructions, lubricate
and install the O-ring (key 15) on the dome spacer
(key 13). If a dual dome is being assembled, install the
Design V260
Note
7
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