Purging The Enviro-Seal Bellows Seal Bonnet - Fisher Design ED series Instruction Manual

1
NOTES:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
1
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
A5887 / IL
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.
The ENVIRO-SEAL stem/bellows
assembly has a one-piece stem.
4. If the valve plug and adaptor are not in good
condition and must be replaced, the valve plug/adaptor
assembly must first be removed from the stem/bellows
assembly and then the valve plug removed from the
adaptor. First, place the stem/bellows assembly and
valve plug in a soft-jaw chuck or other type of vise so
that the jaws grip a portion of the valve plug that is not
a seating surface. Drive out or drill out the pin (key 8,
figure 19, 20, or 21). Drive out the pin (key 36, figure
18).
5. Then, reverse the stem/bellows and plug/adaptor
assembly in the soft-jaw chuck or vise. Grip the flat
areas on the valve stem just below the threads for the
actuator/stem connection. Unscrew the plug/adaptor
Design ED & EAD Class 125-600
1
1
12B4181-A 18A0909-D
1
9.5 mm
(3/8 INCH)
STEM
Figure 13. Double Graphite Ribbon/Filament Arrangements for
Use in ENVIRO-SEAL Bellows Seal Bonnets
Note
1
1
12B6102-
12.7 mm A
(1/2 INCH)
STEM, 2 INCH STEM, 3 AND 4 INCH
VALVES
assembly from the stem/bellows assembly. Unscrew
the valve plug from the adaptor.
6. To attach either the existing or a new valve plug to
the stem of the new ENVIRO-SEAL stem/bellows
assembly, first attach the plug to the adaptor (if the
valve plug was removed from the adaptor) as follows:
D Locate the adaptor. Notice that a hole has not
been drilled in the new adaptor threads where the plug
screws onto the adaptor.
D Secure the valve plug in a soft-jaw chuck or other
type of vise. Do not grip the plug on any seating
surface. Position the plug in the chuck or vise for easy
threading of the adaptor.
D Thread the adaptor into the valve plug and
tighten to the appropriate torque value.
7. Complete the installation by following steps 7
through 15 of the ENVIRO-SEAL Bellows Seal Bonnet
installation instructions given above.
Purging the ENVIRO-SEAL Bellows Seal
Bonnet
The ENVIRO-SEAL bellows seal bonnet has been
designed so that it can be purged or leak tested. Refer
to figure 18 for an illustration of an ENVIRO-SEAL
bellows seal bonnet. Perform the following steps for
purging or leak testing.
1. Remove the two diametrically opposed pipe plugs
(key 16).
2. Connect a purging fluid to one of the pipe plug
connections.
BUSHING
(KEY 13)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
GRAPHITE RIBBON
PACKING RING (KEY 7)
SPACER
(KEY 8)
12.7 mm
(1/2 INCH)
VALVES
19