Welded Taper Key Replacement - Emerson Fisher Vee-Ball V200 Instruction Manual

Vee-Ball Valves
March 2021
a. Insert the drive shaft into the valve body bearing (key 10), and into the ball ear. Align the hole in the drive shaft
with the holes in the ball.
b. Insert the taper key into the ball and drive shaft as shown in figure 14.
D Installing the Taper Key
Current standard construction materials for all NPS 3 through 12 valves require the taper key (key 4, figure 14) to be
tack welded in place after properly seating, using the following procedure. Use standard welding preparations when
preparing parts for reassembly.
CAUTION
Make sure the drive shaft (key 6) is free of oil or grease, otherwise the taper key will not seat properly. Failure to properly
set the taper pin or taper key could result in it coming loose while in service. Loosening of the taper key in service could
result in improper valve function and equipment damage.
Figure 14. Taper Key Installation
6. Install the drive shaft (key 6) into the valve body through the ball and into the lower bearing.
7. Insert the taper key (key 4) into ball and drive shaft (keys 2 and 6) as shown in figure 14. The taper key inserts, with
the flat side of the key, facing the drive shaft (key 6).
8. Using a flat end punch, drive the groove pin (key 7) into the ball ear and follower shaft until it is flat with the ball ear
surface. Stake both ends of the pin hole with a center punch to ensure the groove pin does not come out.
9. Using a flat end punch, drive the taper key (key 4) into the ball ear and drive shaft (key 6) until solid, heavy contact is
obtained between the key and shaft.
10. Measure the position of the taper key head.
11. Drive the taper key in further using the minimum distance shown in table 5.
24
MINIMUM ENGAGEMENT OF TAPER KEY
31B0727‐E
A6035‐1
MAXIMUM ENGAGEMENT OF TAPER KEY
Instruction Manual
BALL
(KEY 2)
TACK WELD
TAPER KEY
(KEY 4)
DRIVE SHAFT
(KEY 6)
TACK WELD
TAPER KEY
(KEY 4)
D101554X012