Instruction Manual

Instruction Manual
D101554X012
Vee-Ball Valves
January 2015
22
Figure 14. Taper Key Installation
MAXIMUM ENGAGEMENT OF TAPER KEY
31B0727-E
A6035-1
BALL
(KEY 2)
TACK WELD
TAPER KEY
(KEY 4)
DRIVE SHAFT
(KEY 6)
TACK WELD
TAPER KEY
(KEY 4)
MINIMUM ENGAGEMENT OF TAPER KEY
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
theflatsideofthekey,facingthedriveshaft(key6).
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 centerpunchtoensurethegroovepindoesnotcomeout.
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 4.
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
shownintable5.
Note
All v alve 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 1/8inchdiameterweldonNPS3through6valves,
D 3/16 inch diameter weld on NPS 8 through 10 valves, and
D 1/4inchdiameterweldonNPS12valves.