Fisher 8560 - Seal Ring Maintenance for NPS 3 through 12; Disassembly

Instruction Manual
D102013X012
8560 Valve
June 2017
16
1. Install the new packing parts (see figure 8). Install the packing follower and finger tighten the packing flange nuts
onto the studs only enough to stop leakage.
2. If the valve was equipped with a bonding strap assembly (figure 5), re‐install the assembly.
3. Refer to the Actuator Mounting section of this manual. If necessary, refer to the separate actuator instruction
manual for adjustment procedures.
4. When the control valve is being placed into operation, check around the packing follower for leakage.
For PTFE‐filled or graphite standard packing arrangements covered in this manual, leakage from the packing can often
be stopped by tightening the packing flange nuts just enough to stop the leak.
CAUTION
Use caution when tightening the nuts. Overtightening the nuts can damage packing box parts and result in increased drive
shaft friction.
Seal Ring Maintenance for NPS 3 through 12
Perform this procedure if the control valve is not shutting‐off properly (if it is leaking downstream). It is recommended,
but not required, to remove the actuator for easier handling of the valve during the following procedures.
CAUTION
During any of the following steps, do not rotate the disc past 90 degrees in the open direction. Rotating the disc past 90
degrees can damage the seal ring.
Figure 9. Retainer Ring Knock‐Out Flat
A6304
FLAT END PUNCH
KNOCK-OUT FLAT
Key numbers are shown in figure 14 unless otherwise noted.
Disassembly
Refer to the Removing the Actuator section. Most maintenance procedures will require the actuator to be removed.