Fisher A41 Instruction Manual page 25

5. Unscrew and remove the packing flange nuts (key 12), packing followers (keys 15 and 16), and packing flanges
(keys 9 and 10) if used, from both sides of the valve.
Table 6. Recommended Bolt Torques for Actuator/Mounting Cap Screws and Nuts
VALVE SIZE, NPS
2, 3, 4, 6, & 8
10 & 12
2, 3, 4, & 6
8 & 10
12
WARNING
Once the shaft has been removed in the following step, the disc may fall from the valve body. To avoid personal injury and
disc damage, support the disc to prevent it from falling as the shaft is being removed.
6. Pull the shaft out through the actuator side of the valve.
7. Remove the disc from the valve.
8. Remove the packing rings (key 13), the packing washers (key 27, figure 6) if used, and the packing box ring (key 14).
9. If either of the bearings (key 6) require maintenance or replacement, remove them.
CAUTION
When replacing a valve disc or shaft, a new disc/shaft/taper pin assembly (key 3) should be used. Using a new disc with a
used shaft requires drilling and reaming new taper pin holes in the shaft. The extra set of taper pin holes weakens the shaft
and may cause it to fail in service.
10. Clean the packing boxes and metal packing box parts.
Assembly
1. Drop in the new bearings. Make sure to orient the tab in the bearing with the slot in the seal.
2. Insert the disc into the valve body. Be certain the taper pin holes in the disc are on the actuator side of the valve.
Also be certain the letter C stamped on either face of the disc is on the same side of the valve as the letter C
stamped on the outside of the valve (figure 7).
3. Slide the shaft through the valve body and disc.
4. Install the disc and spacers into the valve body. Insert the shaft into the valve body and through the disc.
5. Slide the shaft all the way into the valve body.
6. To ensure that the direction of taper in the shaft taper pin holes matches that of the disc taper pin holes,
temporarily install the packing follower (key 15) or, if used, the packing flange (key 9) with rotation tag (key 19).
With the disc fully opened, rotate the shaft until the line on the end of the shaft indicates the OPEN position as
shown in figure 7. Insert the taper pins (key 3C), small end first, into the taper pin holes on the C-marked side of the
disc. Do not drive in the pins. Remove the packing follower or flange.
7. Insert a packing box ring (key 14) into each packing box.
RECOMMENDED BOLT TORQUE
NSm
CL150 Valves
88
135
CL300 Valves
88
135
183
lbSft
65
100
65
100
135
25