Instruction Manual
D103302X012
A81 Valve
January 2011
12
Figure 5. Orientation of Bearing Tabs
BEARING TAB
BEARING TAB
BACKSIDE OF VALVE
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
(key 40) from the driveshaft (key 10). 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).
7. Install the anti‐blowout ring (key 40) onto the drive shaft (key 10) before installing the packing follower.
8. Mount the actuator and adjust the closed position of the valve, per the Actuator Mounting section on page 18 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.
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