Instruction Manual
D104425X012
V280 Valve
August 2019
11
13. Turn the ball (key 3) to the closed position. Use an approved lifting 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.
14. Remove the two bearing plates (key 8) and thrust washers (key 10) from the ball. Inspect the lined bushing (key 9)
in each bearing plate and the thrust washers. If necessary, replace worn components.
15. Evenly loosen the nuts (key 18) from the studs (key 4) on the lower tailpiece and lift the body (key 1) from the
tailpiece (key 2).
16. For dual seal constructions, repeat step 11.
17. For dual dome attenuator constructions, repeat step 12.
Valve Assembly
Be sure to replace valve parts in the same position and orientation from which they were removed. Use the following
steps to reassemble the valve.
Note
Clean and protect all sealing surfaces from damage while installing parts. Lubricate components when necessary as an aid for
installation, and to help protect sealing surfaces.
Refer to figure 4 that identifies the V280 valve components by key number.
During assembly, visually inspect component surfaces that interface with an O-ring or seal for any damage or foreign
material that may prevent proper sealing.
1. Place both tailpieces (key 2), flange end down on a clean soft surface with the seal assembly cavity facing up. Use
caution to protect the flange end serrated surfaces.
2. For all attenuator dome constructions, lubricate the tailpiece retaining ring groove, attenuator dome counterbore
surface, and the surface where the attenuator dome will rest against the tailpiece with an anti-seize lubricant (key
45). This will aid in the disassembly process.
3. For all attenuator dome constructions, install the grooved end of the groove pin (key 27) into the tailpiece as far as
it will go. Take care not to bend the pin. This groove pin will prevent the attenuator dome from rotating within the
tailpiece
4. Install the attenuator dome by aligning the pin hole in the attenuator dome with the groove pin (key 27) installed in
the bottom of the tailpiece.
5. Install the retaining ring (key 28) into the tailpiece by expanding the coils of the retaining ring and installing one end
into the groove. Hold the one end installed into the groove and press down around the perimeter of the retaining
ring in a winding fashion until the ring is fully seated into the groove. There should be audible indication of the ring
once it has fully seated in the groove. Take care to not damage the sealing surface of the tailpiece.
6. Lubricate (key 33) the tailpiece counterbore above the retaining ring groove where the seal will sit in the tailpiece.
7. On the seal (key 5), install the O-ring (key 14) and back-up ring (key 15) with the back-up ring towards the valve
8. Install the wave spring (key 17) into the tailpiece.
9. Lubricate (key 33) the installed O-ring and back-up ring on the seal and insert the seal assembly into the tailpiece
counterbore. Maintain axial alignment of the two components as the seal assembly is drawn down into place.
Note
For single or dual characterized attenuator dome constructions, verify that the ball opens into the attenuator dome window(s)
last. If not, remove the attenuator dome and tailpiece and rotate 180
°
to allow the window(s) to open last.
