Trim Maintenance; Disassembly - Fisher Design ED series Instruction Manual

Design ED & EAD Class 125-600
1
1
14A3411-C 13A9775-E
9.5 mm 12.7 mm
(3/8 INCH) (1/2 INCH)
STEM STEM
SINGLE ARRANGEMENTS
NOTES:
1
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
B2350 / IL
11. Install new packing and the metal packing box
parts according to the appropriate arrangement in
figure 3, 4, or 5. Place a smooth-edged pipe over the
valve stem and gently tap each soft packing part into
the packing box.
12. Slide the packing follower, upper wiper, and
packing flange (keys 13, 12, and 3, figure 18) into
position. Lubricate the packing flange studs (key 4,
figure 18) and the faces of the packing flange nuts
(key 5, figure 18). Install the packing flange nuts.
13. For spring-loaded PTFE V-ring packing, tighten
the packing flange nuts until the shoulder on the
packing follower (key 13, figure 18) contacts the
bonnet.
For graphite packing, tighten the packing flange
nuts to the maximum recommended torque shown in
table 4. Then, loosen the packing flange nuts, and
retighten them to the recommended minimum torque
shown in table 4.
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 4. Then, tighten the remaining flange
nut until the packing flange is level and at a 90-degree
angle to the valve stem.
For ENVIRO-SEAL or HIGH-SEAL live-loaded
packing, refer to the note at the beginning of Packing
Maintenance.
8
PACKING
FOLLOWER (KEY 13)
GRAPHITE
RIBBON
PACKING RING (KEY 7)
1
GRAPHITE
FILAMENT PACKING
RING (KEY 7)
LANTERN RING (KEY 8)
PACKING BOX
RING (KEY 11)
13A9776-D
19.1, 25.4, OR
31.8 mm
(3/4, 1, OR
1 1/4 INCH)
STEM
Figure 5. Graphite Ribbon/Filament Packing for Plain or Extension Bonnets
1
1
1
1
14A2153-D 14A1849-E 14A1780-D
9.5 mm 12.7 mm 19.1, 25.4, OR
(3/8 INCH) (1/2 INCH)
STEM STEM
DOUBLE ARRANGEMENTS
14. Mount the actuator on the valve assembly and
reconnect the actuator and valve stem according to
the procedure in the appropriate actuator instruction
manual.

Trim Maintenance

For C-seal construction, see the appropriate C-seal
sections in this instruction manual.
Except where indicated, key numbers in this section
are referenced in figure 19 for standard 1-through
6-inch constructions, figure 20 for Whisper Trim III
cage detail, figure 21 for the 8-inch Design ED valve,
and figures 22 and 23 for WhisperFlo trim. Some valve
plug constructions require three piston rings (key 6).

Disassembly

1. Remove the actuator and the bonnet according to
steps 1 through 5 of the Replacing Packing procedure
in the Maintenance section.
To avoid personal injury due to leaking
fluid, avoid damaging gasket sealing
surfaces. The graphite piston rings in a
Design ED or EAD valve are brittle and in
two pieces. Use care to avoid damage to
the piston rings caused by dropping or
rough handling.
PACKING
FOLLOWER (KEY 13)
GRAPHITE
RIBBON
PACKING RING (KEY 7)
GRAPHITE
FILAMENT
PACKING RING (KEY 7)
LANTERN RING (KEY 8)
PACKING BOX
RING (KEY 11)
31.8 mm
(3/4, 1, OR
1 1/4 INCH)
STEM
WARNING