Typical Metal Micro‐Notch Ball And Drive Shaft; Dn 25 - 50 (Nps 1 Through 2) Valves - Fisher Vee-Ball V150 Instruction Manual

Instruction Manual
D101554X012
12. Inspect the ball/shaft taper key connection to verify that the taper key spans the entire shaft flat width. If not, the
taper key must be driven in further until this condition is satisfied. However, do not exceed the maximum depths
shown in table 6.
Note
All valve taper keys are tack welded, except titanium.
13. When the above conditions are met, tack weld the taper key (key 4) to the ball ear on the head end of the key (see
figures 24 and 25). Use a:
D 1/8 inch diameter weld on NPS 3 through 6 valves,
D 3/16 inch diameter weld on NPS 8 through 10 valves, and
D 1/4 inch diameter weld on NPS 12 valves.
Figure 15. Typical Metal Micro‐Notch Ball and Drive Shaft
For all constructions: Refer to Replacing the Ball Seal, Packing Maintenance, and other procedures as necessary to
complete the assembly of the valve.

DN 25 - 50 (NPS 1 through 2) Valves

Procedures for disassembly and assembly of the bearings and ball cannot be accomplished until the ball seal and valve
packing are removed from the valve.
Refer to the Replacing Packing procedures to remove the actuator, and to remove the packing flange and packing
follower from the valve. When the packing disassembly steps are complete, return to this section.
Refer to the Replacing the Ball Seal procedures to remove the ball seal from the valve.
Disassembly
WARNING
When the actuator is removed from the valve, the ball/shaft assembly may suddenly rotate, with a shearing, cutting
motion, which could result in personal injury. To avoid injury, carefully rotate the ball to a stable position at the bottom of
the valve body cavity. Make sure the ball will not rotate.
MICRO‐NOTCH
W6256
V‐NOTCH BALL
DRIVE SHAFT
Vee-Ball Valves
June 2017
25