Fisher EWS Series Instruction Manual page 24

EW Valve
NOTE:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
A5887-1/IL
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). Drive out the pin
(key 36, figure 21).
5. Then, reverse the stem/bellows and plug/adaptor
assembly in the soft-jaw chuck or vise. Grip the flat
24
12B4181–A/IL 18A090–E/IL
9.5 mm 12.7 mm
(3/8 INCH) (1/2 INCH) STEM,
STEM FOR NPS 2 VALVES
Figure 16. Double Graphite Ribbon/Filament Arrangements for
Use in ENVIRO-SEALr Bellows Seal Bonnets
Note
12B6102–A/IL
12.7 mm (1/2 INCH)
STEM, FOR NPS 3
AND NPS 4 VALVES
areas on the valve stem just below the threads for
the actuator/stem connection. Unscrew the
plug/adaptor 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.
Instruction Manual
Form 2376
March 2007
BUSHING
(KEY 13)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
GRAPHITE RIBBON
PACKING RING (KEY 7)
SPACER (KEY 8)