Instruction Manual

Instruction Manual
D101554X012
Vee-Ball Valves
January 2015
19
Key numbers in this procedure are shown in figures 24, 25, and 26, unless otherwise indicated.
1. A taper key
(key 4, figures 14, 24, 25 and 31) is used to connect the ball and drive shaft in NPS 3 through 12 valves.
2. Carefully rotate the ball to the open position after the actuator is disconnected. Make sure the ball will not rotate
(see warning above). Provide support for the ball during the following disassembly.
3. Working from the small end of the groove pin (key 7), use a pin punch to drive the groove pin out of the ball ear and
follower shaft.
For tack welded taper keys, driving the taper key out of the ball ear will shear the tack welding.
4. Locate the small end of the taper key (key 4, see figures 14, 24, 25 and 31). Using a pin punch on the smaller end of
the taper key, drive it out of the ball (key 2) and drive shaft (key 6). Note: driving the taper key in the wrong
direction will tighten it.
5. Pullthedriveshaft(key6)outoftheactuatorsideofthevalvebody.
CAUTION
Exercise care to avoid damaging components in the following procedure.
6. Theballwillbefreetomovewhenbothshaftsareremoved.Makesurethesealingsurfaceoftheballisnot
damaged while removing the follower shaft.
a. Unscrew the pipe plug (key 25) if one is installed. Use a punch to drive t he follower shaft (key 9) into the center of
the ball.
b. If a pipe plug is not
installed, use a piece of continuous threaded rod as a removal rod when moving the follower
shaft (key 9) into the center of the ball. Refer to the table 3 for a description of the size threaded rod needed. The
length of the rod should allow easy working room from the valve body.
7. Carefully remove the follower shaft and ball (key 2) from the valve body.
For NPS 4 valves with
attenuator, remove the ball/attenuator through the inlet of the valve. Taking hold of the follower
shaft ear on the ball/attenuator, you must position the scalloped edge of the attenuator against the valve bore
opening and then pivot, or roll, the ball/attenuator out of the valve body (see figure 18).
For NPS 6, 8, 10, and 12 valves with
attenuator, remove the ball/attenuator through the outlet of the valve by carefully
turning and manipulating the ball. The NPS 6, 8, 10, or 12 ball/attenuator will not come straight out of the valve body.
8. Remove the bearings (key 10) by hand. If the bearings are tight in the valve body, then pull or drive them out with a
slight pressure.
D To remove the follower shaft bearings, use a blind-hole bearing puller. If you do not have such a tool, you can
machine the bearing out.
9. Thoroughly clean surfaces of all parts that are to be re-used or obtain replacement parts.
Assembly
1. Inspect all sealing surfaces to ensure they are in good condition and without scratches or wear.
2. Install the replacement bearings (key 10) by hand. The bearing flanged end should touch the valve body.
3. Installing the Vee-Ball: Ensure the ball part number matches up with the appropriate seal type as shown in the key 2
ball table in the parts list section of this instruction manual.
WARNING
The ball might be damaged if it is allowed to fall into the valve body. To avoid personal injury or damage to the sealing
surfaces, support the ball to prevent it from falling into or out of the valve body cavity.