Instruction Manual

Instruction Manual
D100390X012
ED Valve
October 2014
23
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 of the
Maintenance section.
2. 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.
Note
The ENVIRO-SEAL stem/bellows assembly for easy-e valves is available only with a threaded and pinned 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 i s reused, and the adaptor is in good condition, it may be reused also. 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.
Figure 13. Double Graphite Ribbon/Filament Arrangements for Use in ENVIRO-SEAL Bellows Seal Bonnets
9.5 mm
(3/8-INCH)
STEM
12.7 mm
(1/2-INCH)
STEM, NPS 2
VALVES
12.7 mm
(1/2-INCH)
STEM, NPS 3 AND 4
VALVES
NOTES:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
1
1
1
1
1
1
1
BUSHING
(KEY 13)
SPACER
(KEY 8)
GRAPHITE RIBBON
PACKING RING (KEY 7)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
A5887
12B4181-A 18A0909-D 12B6102-
A
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.
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.