Replacing The Seal Ring Assembly - Emerson Fisher Control-Disk CL600 Instruction Manual

CL600 Control-Disk Valve
January 2019
For valves with ENVIRO‐SEAL packing systems:
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 shutoff 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.
CAUTION
When removing the actuator, use a wheel puller to separate the actuator parts from the valve shaft. Do not drive the
actuator parts off the valve shaft because this could damage valve trim components.
2. Remove the actuator per instructions in separate actuator instruction manuals, then remove the cap screws (key
31). Remove the clamp (key 33, figure 7) if the strap (key 34, figure 7) is used.
3. Loosen the two packing hex nuts evenly to remove spring tension, then remove the nuts.
4. Remove the packing flange and spring pack assembly. The spring pack assembly consists of the spring stack and
packing follower. The spring stack is retained on the packing follower by an O‐ring. Remove the anti‐blowout ring, if
used (NPS 3-8) (key 23) from the drive shaft (key 7). Remove the anti‐extrusion washer, the packing set, and the
packing ring.
CAUTION
The valve shaft surface condition is critical in making and maintaining a good seal. If the valve shaft surface is scratched,
nicked, dented, or worn, replace the valve shaft before replacing the packing system.
5. Inspect the existing valve shaft. If necessary, replace the valve shaft as described in the Replacing the Disk, Shafts, or
Bearings section.
6. Install the new packing system components as described in the ENVIRO‐SEAL Packing System for Rotary Valves
Instruction Manual (D101643X012). For NPS 3-8, two packing box rings (key 21) are used on the top and bottom of
the packing set (see figures 8, 13, and 14 for details). For NPS 10-24, only one packing box ring (key 21) is used on
the bottom of the packing set, at the end closest to the disk (see figure 15 for details).
7. Install the anti‐blowout ring, if used (NPS 3-8) (key 23) onto the drive shaft (key 7) before installing the packing
follower.
8. Mount the actuator and adjust the closed position of the valve, per the Actuator Mounting section on page 22 of
this manual, before returning the valve to service.

Replacing the Seal Ring Assembly

Perform this procedure only if the control valve is not shutting off properly (that is, leaking downstream). This
procedure does not require removing the actuator from the valve body.
Key numbers in this procedure are shown in figures 13, 14, and 15 unless otherwise indicated.
1. Isolate the control valve from line pressure, and relieve pressure from the valve body. Shut off and disconnect all
lines from the power actuator.
WARNING
The edges of a rotating disk have a shearing effect that may result in personal injury. To help prevent such injury, stay clear
of the disk edges when rotating the disk (key 6).
14
Instruction Manual
D104143X012