Fisher CV500 Instruction Manual page 16

CV500 Valve
June 2017
Do not drive the actuator parts off the valve drive shaft since this could move the valve bearings, shafts, and ball away from
proper alignment, causing improper seating of the ball. Such misalignment may result in damage to valve components if
the valve is returned to service without disassembly and inspection of the ball alignment.
WARNING
Refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shut‐off all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Remove the actuator cover. Note the actuator orientation with respect to the valve body and the lever orientation
with respect to the valve drive shaft (see figure 2). Remove the lever but do not loosen the actuator turnbuckle
adjustment. Remove the actuator mounting screws and nuts, and remove the actuator. If necessary, refer to the
actuator instruction manual for assistance.
3. With the valve body (key 1) out of the pipeline, loosen the packing nuts (key 16). If the packing is to be reused, do
not remove it. However, Emerson recommends that the packing be replaced whenever the drive shaft is removed.
Table 7. Data for Tapped Holes on Valve Shaft
VALVE SIZE, NPS
3
4
6
8
10
12
4. Rotate the V‐notch ball (key 2) to the fully open position.
5. Drive out the groove pin (key 39) that secures the ball (key 2) to the follower shaft (key 38). Remove the groove pin
from the ball ear in the direction shown in figure 6.
Using a pin punch and hammer, firmly strike the chamfered end of the expansion pin through the smaller hole. You
may need to bend the pin or drill the pin before it can be completely removed.
Remove both pins from the ball ear in the direction shown in figure 6. Driving the pins in the other direction will
tighten the pins.
6. For NPS 3 through 8, remove the pipe plug (key 29). Using a punch, drive the follower shaft (key 38) into the center
of the ball (key 2). Use care to avoid dropping the follower shaft.
7. For NPS 10 and 12, remove the hex nuts (key 44), and then remove the bottom flange (key 40). Thread a bolt into
the end of the follower shaft and pull the follower shaft out of the valve. Refer to table 7 for thread sizes. The
bearing (key 6) may come out with the follower shaft.
8. For NPS 3 through 8, refer to figure 6. The expansion pin (key 9) and the taper pin (key 10) inside of it are holding
the ball in position on the drive shaft. Find the larger hole in the ball ear where these pins enter the ear. On the
16
Through Valve At Spline End
mm
25.4
25.4
31.8
38.1
38.1
38.1
44.5
53.8
53.8
SHAFT DIAMETER
Through Valve
25.4 1.00
19.1 1.00
31.8 1.25
38.1 1.50
31.8 1.50
38.1 1.50
44.5 1.75
53.8 2.12
50.8 2.12
Instruction Manual
D101640X012
At Spline End
Inches
1.00
0.75
1.25
1.50
1.25
1.50
1.75
2.12
2.00
THREAD
SIZE,
UNC
3/8‐16
5/16‐18
3/8‐16
1/2‐13
3/8‐16
1/2‐13
1/2‐13
3/4‐10