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V280 Valve
August 2019
5. Provide a clean soft working surface to protect the tailpiece‐flange serrated surface. Lift the valve and place it on
either tailpiece flange face. Be sure the valve is in a stable, upright position before releasing the hoist connection.
Note
If the packing (key 105) is in good condition, it is possible to remove and replace the seal assembly (key 5) without removing the
packing box housing assembly. However, the packing box housing assembly must be removed to remove the ball (key 3) from the
valve body.
6. Remove the packing box housing nuts (key 21).
7. Remove the packing box housing assembly from the valve. The assembly includes the drive shaft (key 20), O-ring
and back-up ring (keys 13 and 16), shaft bearing (key 7), shaft thrust washer (key 11), and all packing parts.
Note
Verify that the grounding ball is installed in the drive shaft-to-ball tang interface to guarantee electrical continuity between ball
(key 3) and valve drive shaft (key 20).
8. If it is desired to separate the packing box assembly parts, loosen or remove the packing components and slide the
shaft down and out the valve side of the packing box housing. Inspect the drive shaft bushing (key 7) and the thrust
washer (key 11). If necessary, replace worn components.
9. Remove the valve body nuts (key 18) from the studs (key 4) on the upper tailpiece and remove the tailpiece (key 2)
from the valve body (key 1).
CAUTION
While lifting the tailpiece (key 2) with seal (key 5) from the valve body (key 1), check to see if the seal (key 5) is lifting with
the tailpiece. If so, use caution in case the seal falls out and protect the ball and the body sealing surfaces. An additional
strap can be employed to ensure the seal is captured in the event it disengages from the tailpiece.
If the valve assembly is resting on the base bracket during disassembly, secure the valve when removing the tailpieces from
the body to prevent tipping.
10. Turn the tailpiece assembly over so the seal is facing up and place it on a clean soft surface to protect the flange
serrated surface.
11. Remove the seal (key 5) from the tailpiece by using the 1/4-20 UNC jack bolt tappings on the seal flange. This will
aid with disengaging the O-ring from the tailpiece seal gland. Be sure to not use any tools that could cause damage
to the sealing surface. Note the configuration of the seal O-ring (key 14) and back-up ring (key 15) and the wave
spring (key 17). Ensure the bearing plate (key 8) dowel pins (key 23) are accounted for.
12. If the tailpiece has an attenuator dome (key 24), place a flat head screw driver in the removal notch on the retaining
ring (key 28) and pry the retaining ring out of the groove. Once the removal notch end of the retaining ring is out of
the groove, pull up on the removal notch end to unseat the retaining ring from the groove. Be sure not to scratch
the O-ring sealing surface while performing this operation. Clean and protect all sealing surfaces.
WARNING
When lifting the ball, ensure the bearing plates (key 8) are secure on the ball trunnions to prevent parts from falling which
may cause personal injury or property damage.
10
Instruction Manual
D104425X012
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