Instruction Manual
D103302X012
A81 Valve
January 2011
11
2. Remove the actuator per instructions in separate actuator instruction manuals, then remove the cap screws and
3. Remove the packing flange nuts and the packing flange (key 26) if used and pull out the packing follower (key 25).
4. Remove the anti‐blowout ring (key 40) from the drive shaft (key 10).
5. Remove the old packing rings (key 24) and, if used, the packing washers (key 31). Carefully avoid scratching the
shaft or packing box wall to avoid damage that could cause leakage around the shaft. Clean all accessible metal
parts and surfaces to remove particles that would prevent the packing from sealing.
WARNING
Do not lubricate parts when used in oxygen service, or where the lubrication is incompatible with the process media. Any
use of lubricant can lead to the sudden explosion of media due to the oil/oxygen mixture, causing personal injury or
property damage.
6. Use the appropriate procedures below for installing packing.
D
Install the packing as shown in figure 4.
D
With graphite ribbon packing, stack the packing rings and packing washers together, and slide the stack into the
packing box as far as it will go while carefully avoiding trapping air between the rings.
D
Install the anti‐blowout ring (key 40) in the groove on the drive shaft (key 10).
D
Install the packing follower and, if used, the packing flange.
D
Install the packing flange nuts, and tighten them only far enough to stop leakage under normal operating
conditions.
D
(key 130, figure 3), and connect the other end of the bonding strap assembly to the valve body with a cap screw
(key 35). Secure each cap screw with a hex nut (key 36).
7. 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.
8. When placing the control valve into operation, check around the packing follower for leakage; retighten the
packing flange nuts as required according to accepted bolting procedures.
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 and
