Replacement Of An Installed Enviro-Seal Bellows Seal Bonnet (Stem/Bellows Assembly) - Emerson Fisher ET Instruction Manual

Instruction Manual
D100398X012
12. Properly lubricate the bonnet stud bolts. Install and tighten the bonnet hex nuts to the proper torque.
13. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 8 or 9.
14. Install the packing flange. Properly lubricate the packing flange stud bolts and the faces of the packing flange nuts.
For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 6. Then,
loosen the packing flange nuts, and retighten them to the recommended minimum torque shown in table 6.
For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts
reaches the minimum recommended torque shown in table 6. Then, tighten the remaining flange nut until the
packing flange is level and at a 90‐degree angle to the valve stem.
15. Install travel indicator parts and stem locknuts; mount the actuator on the valve body according to the procedure in
the appropriate actuator instruction manual.
Replacement of an Installed ENVIRO‐SEAL Bellows Seal Bonnet (Stem/Bellows Assembly)
1. Remove the actuator and bonnet according to steps 1 through 5 of the Replacing Packing procedure in the
Maintenance section.
CAUTION
To prevent possible product damage, cover the opening in the valve in the following procedure to protect the sealing
surfaces and to prevent foreign material from getting into the valve body cavity.
2. Carefully remove the ENVIRO‐SEAL stem/bellows assembly. If necessary, also lift out the cage. Remove and discard
the existing bonnet gasket and bellows gasket. Cover the valve body opening to protect sealing surfaces and to
prevent foreign material from entering the valve body cavity.
CAUTION
The ENVIRO‐SEAL stem/bellows assembly for easy-e valves is available only with a threaded and drilled plug/adaptor/stem
connection. The existing valve plug can be reused with the new stem/bellows assembly or a new plug can be installed. If
the existing valve plug is reused, and the adaptor is in good condition, it may be also reused. However, never reuse an old
adaptor with a new valve plug. Using an old adaptor with a new valve plug requires drilling a new pin hole in the adaptor.
This drilling weakens the adaptor and may cause failure in service. However, a used valve plug may be reused with a new
adaptor, except with Cavitrol III trim.
3. Inspect the existing valve plug and adaptor. If they are in good condition, they can be reused with the new
stem/bellows assembly and they do not need to be separated.
CAUTION
When removing/installing a valve plug on the ENVIRO‐SEAL stem/bellows assembly, the valve stem must not be rotated.
Damage to the bellows may result.
To avoid product damage, do not grip the bellows shroud or other parts of the stem/bellows assembly. Grip only the flat
areas on the stem where it extends out of the top of the bellows shroud.
Note
The ENVIRO‐SEAL stem/bellows assembly has a one‐piece stem.
ET Valve
November 2017
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