Instruction Manual
D102178X012
V260 Valve
July 2017
9
9. Turn the tailpiece over so the seal assembly is facing 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 surfaces.
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 injury 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 the valve
body. Lift the ball and set it on a clean soft surface.
12. Remove the two bearing plates and thrust washers (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.
Note
Clean and protect all sealing surfaces from damage while installing parts. Lubricate 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 tailpiece.
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 tailpiece 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 dome spacer into the tailpiece, using the two threaded holes as lifting lugs.
4. Apply thread locking adhesive 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 tailpiece.
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).
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