EW Valve
Instruction Manual
Form 2376
March 2007
24
NOTE:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
Figure 16. Double Graphite Ribbon/Filament Arrangements for
Use in ENVIRO-SEAL
r
Bellows Seal Bonnets
BUSHING
(KEY 13)
SPACER (KEY 8)
9.5 mm
(3/8 INCH)
STEM
12.7 mm
(1/2 INCH) STEM,
FOR NPS 2 VALVES
12.7 mm (1/2 INCH)
STEM, FOR NPS 3
AND NPS 4 VALVES
GRAPHITE RIBBON
PACKING RING (KEY 7)
GRAPHITE FILAMENT
PACKING RING (KEY 7)
12B6102–A/IL
18A090–E/IL
12B4181–A/IL
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.
Note
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
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.
