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Design V260
dome spacer into the tailpiece, using the two threaded
holes as lifting lugs.
4. Apply Loctite to and install the two cap screws (key
36) that hold the washers (key 37) which help retain
the dome or dome spacer (if applicable) in the tail-
piece.
For constructions with dual dome and/or dual seals,
lubricate and install the O-ring (key 7) in the groove on
the inlet seal (key 9). Install the wave spring (key 8)
over the end of the seal. Install the seal assembly O-
ring (key 7) between the dome spacer and the dome
(key 10).
D Verify that the ball opens into the
dome windows last. (See figure 5 )
D If not, remove the dome and tail-
piece and turn it 180 degrees to allow
the windows to open last.
5. Install the grooved end of the groove pins (key 5)
into the bearing plates (key 4) as far as they will go.
Use only a light tapping force, taking care not to bend
the pins.
6. Apply dry film lubrication between the trunnion sur-
faces on the ball and the trunnion bearings.
7. Install new bearings (key 29) in the bearing plates
(key 4).
8. For V260A constructions only, press or tap a plastic
plug (key 35) into the non-splined, bottom end of the
ball.
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.
9. Lift the ball with a nylon sling through the bore and
turn the ball until the port and trunnions are horizontal.
10. Slide one ball thrust washer (key 30) onto each
side of the ball trunnions, and install a bearing plate
(key 4) on each side of the ball trunnions.
8
Note
11. Carefully lower the ball and bearing plates onto
the lower (inlet) tailpiece taking care not to damage the
ball surface.
While lowering the ball, guide the groove pins in the
bearing plates into their proper location in the tailpiece.
To determine the proper location for Right Hand
Mounting, turn the splined trunnion so that it is on your
right hand side when the attenuator dome is in front of
you and the bottom of the valve is nearest you.
12. Install the grooved end of the groove pin (key 18)
into the valve body, as far as it will go. Use only a light
tapping force, taking care not to bend the pin. Install
the body studs (key 3) in the valve body and install two
swivel hoists for lifting the valve body.
13. Lift the valve body, using the swivel hoists, so it is
centered over the ball and beaing plates. Be sure the
shaft hole is aligned with the splined trunnion on the
ball. When lowering the valve body, take care not to
damage the ball. Guide the groove pins in the valve-
body into their proper location in the tailpiece.
14. Install the hex nuts(key 19) on the studs (key 3)
and hand-tighten them.
15. Lubricate and install the O-ring (key 14) on the
packing housing (key 16). Install the shaft bearing (key
32) in the packing box housing.
16. Install the packing housing studs (key 22) in the
valve body.
17. Apply Nickel never Seez, or equivalent, to the
large spline on the shaft. Line-up the missing spIine
tooth with the appropriate space in the ball, and install
the drive shaft (key 20) into the ball.
18. Install the shaft thrust washer (key 24) onto the
shaft.
19. Install the packing housing (key 16) and nuts (key
23), and tighten them evenly to the torque values
shown in table 3. Orient the length of the packing box
housing perpendicular to the bore of the valve body.
20. Assemble the seal and install the second tailpiece
using the following steps.
For dual seal and dual dome constructions, it is easier
to lay the valve assembly on its side while installing
the second tailpiece.
21. Install the dome, dome spacer, and alignment
groove pins (if a characterized attenuator is used) in
the tailpiece.
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